Preliminary 2004 SOHO LASCO Coronal Mass Ejection List (Revised 31-Dec-2004 -- GAS) N.B. This is a working version of a catalogue of activity and probable coronal mass ejections detected in white light observations of the LASCO coronagraphs. This list is maintained at the SOHO Experimenters' Operations Facility, and it is based on an examination of only quick-look data, which represents a subset of the final LASCO dataset. Questions about this list should be directed to: planner@lasco6.nascom.nasa.gov . Note some changes to lists from earlier years: 1) Smaller events 'now' taken into account when possible due to the decline of the solar activity cycle. Date(s) UT Location Comment **** Only partial LASCO data until 2004/01/06 at 09:20 UT **** **** due to intermittent contact during telemetry keyhole.**** **** Most likely some events missed. **** ------------------------------------------------------------------------------------ 01-Jan-2004 08:40 E Gusty outflow from previous event followed by spray-like front to S at 09:40 UT. Gusty outflow continues into next day. 01-Jan-2004 20:40 W Ragged front with cavity and trailing material travelling slightly N, preceded by another ragged front at 17:40 UT. ------------------------------------------------------------------------------------ 02-Jan-2004 08:40 SW Faint asymmetric loop pront with sharp apex already in progress. 02-Jan-2004 16:20 E Typical three-part structure CME already in progress. 02-Jan-2004 09:40 SW Slow rising loop front with twisted inner structure (in progress since previous day) leading to streamer blowout (next entry). ------------------------------------------------------------------------------------ 03-Jan-2004 12:40 SW Streamer blowout somewhen between 12:40 UT and 19:20 UT. ------------------------------------------------------------------------------------ 04-Jan-2004 02:00 SW Ragged asymmetric loop front with cavity and trailing material already in progress to N of streamer blowout. 04-Jan-2004 16:20 NW Ragged front already in progress. ------------------------------------------------------------------------------------ 05-Jan-2004 09:40 SE Asymmetric loop front with cavity and trailing material already in progress, that shows up inside a loop-shaped CME (missed by the telemetry keyhole), which is close to the end of C3 fov by that time. 05-Jan-2004 11:00 SE Ragged loop front most likely residual to previous event. At 17:00 UT (after data gap) outflow continues. 05-Jan-2004 18:00 E Fairly well defined asymmetric loop front, brightest to S. 05-Jan-2004 21:17 SE Ragged asymmetric loop front with cavity and trailing material. ------------------------------------------------------------------------------------ **** High rate telemetry recovered on 06-Jan at 09:20 UT. **** 06-Jan-2004 08:53 E 'Partial' halo CME already close to the edge of C3 fov after data gap. Time of first image given for C3. M5.8 X-ray flare from E90. Gusty outflow follows. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/228.html 06-Jan-2004 19:40 NW Narrow ragged front. ------------------------------------------------------------------------------------ 07-Jan-2004 02:30 W Faint ragged front with trailing material followed at 05:54 UT by a bright spray-like front to S. 07-Jan-2004 04:06 SE Fairly wide and bright ragged loop front with cavity and complex inner structure, develops asymmetry in C3 fov. A small jet precedes the event at 03:30 UT. 07-Jan-2004 10:06 E Fairly well defined loop front with cavity and inner core (typical three-part structure). M8.3 X-ray flare from NOAA AR 10537 at N06E75. 07-Jan-2004 11:06 NE 'Explosive' loop front with cavity at the northern leg of the previous event. Jointly with previous event it develops into a 'partial' halo CME. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/229.html 07-Jan-2004 16:54 S Sequence of faint wide loop fronts develops in a faint 'partial' halo CME. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/230.html 07-Jan-2004 19:54 NE Spray-like front. ------------------------------------------------------------------------------------ 08-Jan-2004 05:06 SE Strong wide loop front with cavity and twisted trailing material brightest to S. Gusty outflow follows along the day. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/231.html 08-Jan-2004 14:54 E Slow rising ragged (wide) asymmetric loop front reaching transequatorial latitudes. 08-Jan-2004 17:06 NE Fast elongated loop front brightest to S that surpasses previous event in C2 fov. It fades in C3. 08-Jan-2004 19:31 SE Spray-like front that precedes event on 2004/01/09 at 02:06 UT. ------------------------------------------------------------------------------------ 09-Jan-2004 02:06 SE Strong flux rope type event with cavity and core. Twisted inner structure. Gusty outflow follows well into next day. 09-Jan-2004 02:30 NE Jet-like front followed by fairly faint ragged asymmetric loop front at 02:54 UT; at PA coincident with that of the northern leg loop. 09-Jan-2004 05:30 NE Ragged narrow loop front to S of event at 02:30 UT. 09-Jan-2004 22:06 W Extremely faint ragged/diffuse loop front. 09-Jan-2004 23:06 W Spray-like front slightly to S. ------------------------------------------------------------------------------------ 10-Jan-2004 05:30 NE Bright ragged loop front with twisted trailing material. Gusty outflow follows. 10-Jan-2004 05:54 SW Very faint ragged loop front. Not discernible in C3. 10-Jan-2004 07:42 N 'Boomerang-type front. Time given for C3. 10-Jan-2004 22:30 NE Loop front much brighter to N with cavity and trailing material. Gusty outflow follows well into next day. ------------------------------------------------------------------------------------ 11-Jan-2004 00:30 NW Very faint spray-like front. 11-Jan-2004 11:30 NW Spray-like front develops into an elongated ragged loop front, preceded by a small jet at 07:31 UT. 11-Jan-2004 18:30 E Ragged front precedes big event at 20:30 UT. 11-Jan-2004 20:30 SE Big loop front with cavity and twisted inner structure develops as a 'partial' halo CME. Loop-shaped outflow follows at S Pole. For details: http://lasco-www.nrl.navy.mil/mail/halo_mail/232.html ------------------------------------------------------------------------------------ 12-Jan-2004 06:30 E Ragged fan-like front likely residual to previous event. It fades throughout C2. 12-Jan-2004 10:06 SE Narrow ragged front followed by gusty outflow well into next day. Some of the brightest ragged fronts in the outflow at: 14:54, 17:30, 20:54, and 00:54 UT (next day). 12-Jan-2004 12:54 SW Narrow spray-like front. 12-Jan-2004 13:31 NW Slow rising helmet-like front followed by loop front with slight cavity, core, and twisted trailing material. Typical 'balloon-type' event. Fairly narrow spray-like front at 22:30 UT at the southern leg of the event. 12-Jan-2004 15:30 E Faint ragged loop front. It fades throughout C3. 12-Jan-2004 23:06 E Ragged front followed by gusty outflow. ------------------------------------------------------------------------------------ 13-Jan-2004 06:54 SE Ragged front followed by gusty outflow and some twisted trailing material. 13-Jan-2004 08:54 SE Infalling 'boomerang-shaped' feature to S of event at 06:54 UT. Similar feature travelling outward. Separation occurs at ~ 4.20 solar radii. 13-Jan-2004 11:30 S Ragged bright loop front with cavity and trailing material. Gusty outflow follows, all along the day. 13-Jan-2004 12:54 SE Ragged front. Helmet-like shape in C3. PA of the southern leg coincident with that of the S eastern leg of previous event. Though evolving with roughly the same speed as previous event in C2 fov, it becomes faster in C3. Gusty outflow well into next two days with some few minor ejections. ------------------------------------------------------------------------------------ 14-Jan-2004 04:54 W Small jet, slightly to N. It fades throughout C2. 14-Jan-2004 08:54 E Faint asymmetric loop front preceded by spray-like front at 08:06 UT that showed up slightly to S. 14-Jan-2004 09:30 W Extremely faint asymmetric loop front at PA coincident with that of the jet at 04:54 UT. Difficult to determine exact time of first appearance in C2. **** LASCO data gap from 14:00 to 15:24 UT due to ICAL01 **** **** (intercalibration for EIT with CDS). **** ------------------------------------------------------------------------------------ 15-Jan-2004 03:30 NE Jet-like front. It fades throughout C2. 15-Jan-2004 06:30 W Jet-like front slightly to N. It fades throughout C3. 15-Jan-2004 07:31 SE Loop-like front along streamer brightest to S with cavity and trailing material. 15-Jan-2004 08:06 SW Spray-like front. 15-Jan-2004 11:06 W Ragged spray-like front. Twisted trailing material. 15-Jan-2004 18:06 NE Jet, followed at 20:30 by faint asymmetric ragged loop front to S, barely discernible in C3 fov. ------------------------------------------------------------------------------------- 16-Jan-2004 01:54 W Fairly symmetric and faint loop front preceded by a jet at 00:54 UT. It fades close to the inner edge of C2 fov. 16-Jan-2004 04:30 NE Big twisted structure with ragged front. 16-Jan-2004 05:06 W Bright loop front with cavity and trailing material that turns elongated in C3 fov with a ragged LE. At 10:30 UT, 'boomerang-shaped' infalling feature. Similar feature traveling outward. Separation point at ~ 3.5 solar radii (PA ~257). 16-Jan-2004 17:06 SW Slow rising faint and diffuse loop' system developing well into next day. ------------------------------------------------------------------------------------- 17-Jan-2004 05:06 SW Clear loop front in the slow rising loops' system. 17-Jan-2004 09:06 W Small ragged front followed by loop front at 10:34 UT. 17-Jan-2004 16:54 S Wide asymmetric loop front followed by a ragged front at PA coincident with loop's leg on SE at 18:30 UT (along the streamer). Gusty outflow follows on SE well into next day. 17-Jan-2004 20:06 SE Very faint asymmetric loop front slightly N of previous event. ------------------------------------------------------------------------------------- 18-Jan-2004 01:31 SE Jet-like front followed by a similar one at 01:54 UT. Most likely residuals to event at 16:54 on 2004/01/17. 18-Jan-2004 01:31 W Very narrow spray-like front barely visible in C3. 18-Jan-2004 03:54 E Ragged loop front brightest to S. It fades in C3, close to the inner edge. 18-Jan-2004 10:34 W Ragged front and twisted trailing material. Couple of small ragged fronts follow at 13:54 and 14:30 UT. 18-Jan-2004 11:54 SW Ragged loop front brightest to S with cavity. Northern leg at roughly the same PA as previous event. Gusty outflow follows. 18-Jan-2004 19:31 W Fast bright ragged loop front with cavity, and core at PA coincident with that of the northern leg of the loop. ------------------------------------------------------------------------------------- 19-Jan-2004 01:54 E Small jet followed by ragged asymmetric loop front slightly to N. Slow rising loops' system on NE. 19-Jan-2004 15:06 W 'Blob-like' feature starts development at ~ 4 solar radii. 19-Jan-2004 19:31 W Faint diffuse loop front. It vanishes close to the inner edge of C2 fov. ------------------------------------------------------------------------------------- 20-Jan-2004 00:06 HALO Big loop front traveling S with cavity and core develops into a 'full' halo CME. Gusty outflow follows to S. C8.2 X-ray flare on NOAA AR 10540 starting at 19:54 UT (on 01/19). EIT Fe XII images show material coming out from the AR starting at around 22:24 UT (on 01/19) . The event has been determined frontsided. For details: http://lasco-www.nrl.navy.mil/mail/halo_mail/233.html 20-Jan-2004 03:54 NE Infalling material with similar feature traveling outward starting at ~ 3.70 solar radii; followed by infalling narrow 'helmet-like' front at 06:54 UT. Also several 'boomerang-type' features traveling outward follow to N. Separation point at ~ 4.3 solar radii. At the time, gusty outflow to N. 20-Jan-2004 08:06 S Very faint loop front (shock?) followed at 08:30 UT by a narrower ragged loop front and trailing material. Gusty outflow follows. 20-Jan-2004 12:06 W Faint spray front. It fades close to the inner edge of C3 fov. 20-Jan-2004 13:54 E Faint spray front. It fades throughout C3. Gusty outflow follows. 20-Jan-2004 15:06 N Faint loops. Difficult to determine exact time of first appearance. 20-Jan-2004 18:54 W Asymmetric ragged loop front slightly to S. 20-Jan-2004 23:54 W Ragged loop front. ------------------------------------------------------------------------------------- 21-Jan-2001 00:54 E Spray-like front 21-Jan-2004 03:06 E Jet-like front slightly to S precedes the HALO at 04:54 UT. 21-Jan-2004 04:54 HALO Bright loop front with cavity and core developing toward SE. By 06:30 UT the loop spans ~ 175 deg from PA 45 - 215. By 06:54 UT very faint extensions arounding the rest of the C2 occultor are discernible. Part of a big filament on the SE quadrant in EIT images is seen to erupt starting at 03:36 UT. Therefore, the event has been determined as a 'full' halo CME, frontsided. Gusty outflow follows at SE. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/234.html 21-Jan-2004 12:30 SE Bright loop front with strong cavity and core. Twisted trailing material. EIT shows the eruption of the rest of the filament in the SE quadrant starting at ~11:00 UT. At PA 136 the mean plane-of-sky speed of the LE averaged 730 km/s based on C3 data. 21-Jan-2004 14:30 NE Narrow ragged loop front. Gusty outflow follows. 21-Jan-2004 15:06 E Extremely faint ragged loop front, spanning roughly from the PA of previous event to that of the next event. It fades throughout C3. 21-Jan-2004 15:30 E Spray-like front slightly to N of the northern leg of event at 12:30 UT. It fades throughout C3. 21-Jan-2004 15:54 S Faint ragged loop front developing slightly to SE. It fades throughout C3. 21-Jan-2004 21:08 SE Ragged loop front with slight cavity preceded by several small jets. In particular, one slightly to N at 20:30 UT. Gusty outflow follows well into next day with several small ragged fronts. 21-Jan-2004 21:54 NW Bright loop front with strong cavity and twisted core. Twisted trailing material. EIT shows the eruption of a big prominence on the NW slowly starting at ~ 21:12 UT. At PA ~291 the mean plane-of-sky speed of the LE averaged 789 km/s based on C3 data. Gusty outflow follows well into next two days. ------------------------------------------------------------------------------------- 22-Jan-2004 00:54 SE Small feature falling down. Similar one going outwards. Separation point at ~ 2.75 solar radii (PA ~ 163). 22-Jan-2004 02:30 NE Extremely faint asymmetric ragged loop front. It fades close to the inner edge of C3 fov. 22-Jan-2004 02:54 W Spray-like front developing slightly to SW. ------------------------------------------------------------------------------------- 23-Jan-2004 06:54 SE Narrow spray-like front followed by a small ragged front at 09:06 UT and a ragged loop front at 11:06 UT, the latter being faster than the one at 09:06 UT. 23-Jan-2004 13:32 E Ragged loops' front with southern leg at roughly PA of previous event. 23-Jan-2004 16:54 SE Jet-like front at PA coincident with that of the southern leg of previous event followed by spray- like front and gusty outflow. Details missed due to data gap between 17:30 - 19:31 UT not filled at the time of writing. 23-Jan-2004 22:30 SE Narrow spray-like front slightly N of previous event. ------------------------------------------------------------------------------------- 24-Jan-2004 04:30 NW 'Double' jet-like front. Barely visible in C3. 24-Jan-2004 05:30 SW Ragged loop front developing toward S. It fades close to the inner edge of C3 fov. It is followed at 07:31 UT by a small ragged front to SE that fades throughout C3. Gusty outflow all along the day. 24-Jan-2004 05:54 SE Very faint relative narrow loop front, preceding another loop front that develops very slowly along the day (first seen in C3 at 21:18 UT) and continues development well into next day. 24-Jan-2004 19:54 S Faint ragged asymmetric loop front. 24-Jan-2004 20:06 W Spray front developing slightly to N. ------------------------------------------------------------------------------------- 25-Jan-2004 04:30 SE Ragged asymmetric loop front followed at 06:30 UT by a fast spray-like front develops as part of event on previous day at 05:54 UT. Gusty outflow. 25-Jan-2004 19:54 NW Spray-like front. ------------------------------------------------------------------------------------- 26-Jan-2004 13:54 E Small ragged front developing slightly to S. 26-Jan-2004 15:30 HALO Loop front on SE with very faint extensions to SW immediatly followed by another one slightly to N with faint extensions above NE limb. Trailing material shaped as a ragged front follows (16:06 UT) at the PA of the southern leg of the second loop front. By 17:18 UT C3 shows very faint but clearly discernible extensions above W, and to a lesser extent above N, limbs. No significant activity reported by GOES at the time. Likewise no significant activity is seen in EIT Fe XII images. The event has therefore been determined as a 'full' halo CME most likely backsided. For other details: http://lasco-www.nrl.navy.mil/mail/halo_mail/235.html ------------------------------------------------------------------------------------- 27-Jan-2004 06:54 NW Very faint narrow spray-like front. It fades in C2. 27-Jan-2004 07:31 N Very faint narrow ragged loop front and twisted trailing material preceded by a small and faint ragged front from which it is difficult to determine the time of first appearance in C2 (in C3: 05:42 UT). 27-Jan-2004 13:31 SW Narrow spray-like front followed by several others at 14:54, 16:06, 16:54, 18:54, 20:58, and 23:30 UT slightly N of streamer. They all fade close to the inner edge of C3 fov. 27-Jan-2004 17:54 SE Extremely faint spray-like front, slightly S of next event. Not discernible in C3. 27-Jan-2004 20:30 E Spray front preceding ragged loop front with twisted trailing material and followed by several very narrow spray-like fronts starting at 04:06 UT on next day as well as gusty outflow until ~19:31 UT, at PA coincident with that of the southern leg of the event. Some small infalling blobs. 27-Jan-2004 22:30 N Faint ragged elongated front with twisted trailing material developing slightly to NW. Barely discernible in C3. ------------------------------------------------------------------------------------- 28-Jan-2004 00:30 SW An initially very slow loop front followed by twisted inner core (flux rope-like) develops in 'streamer blowout'. At 12:18 UT (LE at ~15 solar radii) the plane-of-sky speed of the LE reaches ~ 450 km/s. 28-Jan-2004 06:30 NW Very faint, narrow, elongated, and diffuse spray- like front. It fades throughout C2. 28-Jan-2004 07:31 S Faint loop front to S of event at 00:30 UT. It vanishes close to the inner edge of C3 fov. 28-Jan-2004 10:54 W Extremely faint ragged asymmetric loop front developing slightly to S. Barely visible in C3. 28-Jan-2004 18:54 W Another faint and ragged asymmetric loop front developing slightly to S. Barely visible in C3. 28-Jan-2004 23:54 E Faint ragged front. It fades throughout C2. ------------------------------------------------------------------------------------- 29-Jan-2004 04:54 E Fast narrow ragged loop front brightest to N that surpasses a slow rising loop front. Barely visible in C3. 29-Jan-2004 05:54 SE Extremely faint twisted (and elongated) structure. Barely visible in C3. 29-Jan-2004 05:54 SW Extremely faint ragged loop front. It fades in C2. 29-Jan-2004 16:06 NE Slow rising 'helmet-like' loops' system along streamer. 29-Jan-2004 17:54 E Bright jet-like feature, though following a slightly curved path. It fades in C2. Gusty outflow. 29-Jan-2004 23:54 SE Ragged loop front. 29-Jan-2004 23:54 NE Very faint ragged and elongated loop front to S of streamer, already at ~5.6 solar radii. ------------------------------------------------------------------------------------- 30-Jan-2004 00:06 SW Bright loop front with cavity and core preceded by a very faint asymmetric ragged front. The LE of the loop front has a mean plane-of-sky speed of about ~450 km/sec (based on C3 data, at PA ~ 248). For more accuracy, the HT plot shows slight acceleration (speed of ~350 km/s close to the inner edge, ~ 500 km/sec at ~ 22 solar radii). Filament eruption observed on the SW quadrant of EIT/Fe XII images starting at ~ 22:36 UT on previous day. 30-Jan-2004 04:30 SW Another bright loop front with cavity and twisted core at PA coincident with that of southern leg of previous event. Prominence eruption seen in EIT Fe XII above SW limb starting ~ 02:12 UT. 30-Jan-2004 06:06 E Fairly faint loop front. It fades throughout C2. 30-Jan-2004 11:54 SW Small and fast ragged front behind prominence material (residual) on event reported to start at 04:30 UT. At 13:54 UT the feature shows a clear inverted 'boomerang-like' shape in running difference images. It fades throughout C3. Gusty outflow well into next 3 days. 30-Jan-2004 12:54 NE Faint narrow ragged front. It fades throughout C3. 30-Jan-2004 13:31 NW Very faint jet-like front. It fades throughout C2. 30-Jan-2004 18:30 NE Very slow 'helmet-like' loops' system develops along streamer. 30-Jan-2004 20:30 E Very faint loop front preceded by some infalling blobs to S. It fades close to the inner edge of C3. ------------------------------------------------------------------------------------- 31-Jan-2004 09:30 NW Faint ragged front. It fades throughout C2. 31-Jan-2004 10:34 SE Faint ragged front brightest to S, followed by twisted material. 31-Jan-2004 18:06 E Jet-like front developing toward S, slightly curved toward N. An asymmetric faint ragged loop front develops in parallel to S, at PA of event at 10:34 UT, most likely part of that event. ===================================================================================== 01-Feb-2004 07:31 W Spray-like front. It fades throughout C2. 01-Feb-2004 08:30 E Faint loop front develops. Infalling material is seen at the time close to the inner edge of C2. A similar front (fainter) develops above NE limb. They both fade throughout C3. 01-Feb-2004 16:06 NE Spray-like front. It fades close to the inner edge of C3. 01-Feb-2004 19:31 W Ragged front developing slightly to N. It fades close to the inner edge of C3. 01-Feb-2004 20:30 SE Fan-like front. It fades throughout C2. It is followed at 23:06 UT by a faint asymmetric loop front much brighter to N that also fades in C2. 01-Feb-2004 22:30 NE Extremely faint loop front. Difficult to determine exact time of first appearance. ------------------------------------------------------------------------------------- 02-Feb-2004 01:54 SE Infalling material starting close to the outer edge of C2 (PA ~111). 02-Feb-2004 04:30 NE Bright loop front with strong cavity and trailing material, at PA of that of the southern loop's leg of event at 22:30 UT on previous day. At 08:06 UT material is seen to fall down starting at ~2.80 solar radii, and at 09:54 UT a ragged front develops. More infalling material afterwards and gusty outflow. At 15:30 UT a bright and small ragged front develops, which fades throughout C2. 02-Feb-2004 14:06 SW Faint ragged front, already in progress. Barely visible in C3. ------------------------------------------------------------------------------------- 03-Feb-2004 00:06 SE Very slow development of a loop's system along streamer. See event at 00:06 UT on next day. 03-Feb-2004 02:54 NE Fast ragged elongated loop front, brightest to S at the beginning. It fades throughout C3. 03-Feb-2004 03:54 NW Extremely faint ragged front. It fades in C2. 03-Feb-2004 04:30 S Extremely faint blob falling down and a similar one going outwards. Separation point at ~ 3.2 solar radii (PA ~193). 03-Feb-2004 07:31 NE Bright spray front followed at 09:06 UT by a narrow ragged loop front. 03-Feb-2004 08:30 NW Fairly faint spray-like front. It fades in C2. 03-Feb-2004 16:30 NE Extremely faint ragged and elongated loop front, barely visible in C3. 03-Feb-2004 21:30 NE Ragged front followed at 00:30 UT on next day by a ragged loops' system that develops slowly 'inside' streamer. 03-Feb-2004 21:30 W Spray front. It fades throughout C3. ------------------------------------------------------------------------------------- 04-Feb-2004 00:06 SE The 'slow-development-of-a-loop's-system-along- streamer' event reported to start at 00:06 UT on previous day continues slow development resulting in a complete 'streamer blowout' by 08:54 UT (C2), the exact time of occurrence being difficult to determine. At 06:42 UT (C3 Time) a structured inner core first appears in C3 fov, moving apparently faster than the loops' front LE and therefore pushing it. Gusty outflow follows from where the inner core appeared, all along the day and into next day. 04-Feb-2004 00:30 NE Ragged loops' system develops slowly 'inside' streamer. At ~ 06:30 UT follows twisted material moving faster, slightly to S (difficult to determine exact time). Outflow continues well into next day. 04-Feb-2004 00:30 E Narrow and faint spray front followed by another one at 02:54 UT, at PA that roughly matches that of the northern footpoint of streamer blowout event. They both fade in C2. 04-Feb-2004 07:31 E Fairly faint and elongated loop front. It fades throughout C3. 04-Feb-2004 11:54 W Fast bright loop front and cavity. Some trailing material. M1 flare on AR 10547 starting at 11:24 UT (EIT/Fe XII time). A fairly diffuse front is seen above NW limb at the time, which fades close to the inner edge of C2 fov. 04-Feb-2004 12:54 SE Extremely faint ragged front spanning ~90 deg from PA ~ 80-170. Trailing part of streamer blowout? 04-Feb-2004 15:30 SE Fairly faint asymmetric loop front. ------------------------------------------------------------------------------------- 05-Feb-2004 01:31 W Bright ragged loop front with twisted trailing material. 05-Feb-2004 05:30 W Extremely narrow spray-like front developing toward N of previous event. It fades in C2. 05-Feb-2004 08:30 W Bright ragged loop front. 05-Feb-2004 10:54 W Another bright ragged front developing slightly toward S, at PA of the southern leg of event at 08:30 UT, followed at 13:31 UT by a smaller ragged front at its central PA. 05-Feb-2004 20:30 E Very faint spray front followed by several other spray and ragged fronts for the next couple of days. In particular, one spray-like front at 23:30 UT developing slighyly to S. 05-Feb=2004 22:30 W Fairly diffuse and faint ragged front preceded by a narrow spray-like front (first appearance at 19:31 UT) above W limb (not clear whether the spray is residual to previous events). ------------------------------------------------------------------------------------- 06-Feb-2004 01:54 E Narrow spray front following event reported to start at 20:30 UT on previous day. At 03:30 another spray front, followed at 04:54 UT by a faint asymmetric loop front extending slightly to N. More ragged fronts at: 09:06, 14:54, and 21:08 UT. 06-Feb-2004 04:06 NE Faint elongated spray front. It fades throughout C3. 06-Feb-2004 04:06 W Faint ragged front developing slightly toward S. It fades close to the inner edge of C3. 06-Feb-2004 09:30 NW Extremely faint diffuse front. It fades in C2. 06-Feb-2004 09:54 SW Faint asymmetric loop front brightest to S. It fades close to the inner edge of C3. 06-Feb-2004 20:30 W Extremely faint ragged front. It fades in C2. 06-Feb-2004 23:54 W Very faint ragged front developing slightly toward N. It fades throughout C2. 06-Feb-2004 23:54 N Ragged front brightest to NE, accompanied by a fan-like front to NE. Very faint extensions to NW. In C3, a loop-like structure (with a sharp cusp) developing slightly to N of a diffuse front can be discerned, both appearing in the fov for the first time at 00:42 UT on next day. They both fade throughout C3. ------------------------------------------------------------------------------------- 07-Feb-2004 03:54 W Faint spray-like front developing slightly toward S. It fades very close to the inner edge of C3. 07-Feb-2004 05:30 E More ragged fronts continue along the day. In particular at: 05:30, 06:54, 08:30, 14:30, 18:30, and 23:54 UT. 07-Feb-2004 08:30 NE Close to N Pole: Spray front developing toward N, fades throughout C3. 07-Feb-2004 20:30 W Faint jet-like front developing slightly toward S. It fades throughout C2. ------------------------------------------------------------------------------------- 08-Feb-2004 02:30 E Another ragged front, followed by a faster one at 05:30 UT slightly to N. 08-Feb-2004 03:54 SW Extremely faint diffuse front. It fades close to the inner edge of C2. 08-Feb-2004 08:06 E Another ragged front, bigger than previous ones. Trailing material. Outflow continues all along the day and into next day. In particular, there is an elongated ragged front at 22:06 UT. ------------------------------------------------------------------------------------- 09-Feb-2004 00:30 E Some ragged fronts discernible in the outflow at: 00:30, 04:30, 14:06, 16:30, and 19:31 UT. 09-Feb-2004 01:54 NW Extremely faint jet-like front followed at 05:06 UT by a very faint narrow ragged front, and at 09:06 UT by another faint jet-like front. They all fade in C2. 09-Feb-2004 04:54 SW Extremely faint ragged loop front. It fades in C2. ------------------------------------------------------------------------------------- 10-Feb-2004 04:30 NE Faint and narrow asymmetric loop front brightest to S followed at 06:54 by a 'Y-shaped' feature and, slightly to N at 08:54 UT by a narrow spray (?) front (barely visible in C3). 10-Feb-2004 04:30 N Extremely faint and barely discernible front developing slightly toward NW. 10-Feb-2004 12:06 E Narrow and faint loop like structure, not discernible in C3. 10-Feb-2004 15:30 NE Fairly faint asymmetric loop front preceded at 12:06 UT and 14:06 by a couple of faint jet-like structures. Its development in C3 fov seems to be influenced by the development of event reported at 17:18 on N Pole. 10-Feb-2004 17:18 N Ragged front that first appears at 17:18 UT in C3 fov, difficult to determine first appearance in C2, followed by another ragged front first seen in C2 at 20:58 UT. Outflow to NW, continues into next day. ------------------------------------------------------------------------------------- 11-Feb-2004 08:54 SE Fairly faint ragged loop front followed by another ragged brighter front at 09:54 UT. Outflow all along the day. 11-Feb-2004 11:30 W Spray front developing slightly toward S. It fades throughout C2. **** LASCO data gap from 14:00 to 15:30 UT due to ICAL01 **** **** (intercalibration for EIT with CDS). **** 11-Feb-2004 15:30 W Bright asymmetric loop front brighter to N already in progress after data gap developing slightly toward S, slightly N of event at 11:30 UT. It fades throughout C3. It is followed at 17:30 UT by a faint spray-like front that fades in C2, at PA coincident with that of its northern leg. 11-Feb-2004 23:06 E Ragged front. It fades throughout C3. ------------------------------------------------------------------------------------- 12-Feb-2004 01:54 SE Very faint ragged front that fades throughout C2. 12-Feb-2004 05:54 NW Very faint spray-like front. It fades throughout C2. 12-Feb-2004 13:31 NE Narrow spray-like front. It fades throughout C2. ------------------------------------------------------------------------------------- 13-Feb-2004 02:06 SE Typical '3-part' CME structure with a bright leading edge, cavity and twisted core material. The mean plane-of-sky speed averages 440 km/sec at PA ~121 based on C3 data, showing slight acceleration in C2 FOV. EIT/FeXII images clearly show the ejecta coming out from behind the solar disk. 13-Feb-2004 02:30 W Extremely faint ragged front that vanishes in C2, preceded at ~19:31 UT on previous day by infalling material, and followed at 04:30 UT by another small and faint ragged front. At 07:31 UT follows to N a long jet-like front. 13-Feb-2004 10:54 N Asymmetric front develops very slowly as a system of faint loops along streamer since early in the day, with faint extension over N Pole and to NE. Time of first appearance in C2 cannot be regarded as precise. At 16:30 UT another faint but faster front appears in C2 FOV at PA ~ 340 deg and seems to push the previous front. At 20:30 UT the complex CME spans ~ 140 deg, from PA 300 - 080 (C2). By that time, the streamer is being blown away. No significant activity shown in EIT/Fe II images related to the event. Event classified as a 'partial' halo CME most probably backsided. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/236.html 13-Feb-2004 20:30 SW Ragged front. 13-Feb-2004 23:30 NE Faint loop front. Its southern leg seems to be at PA coincident with that of the leg at NE of the event reported as 'partial' halo CME. ------------------------------------------------------------------------------------- 14-Feb-2004 02:30 N Couple of spray fronts (second one at 05:54 UT) developing slightly towards NE. They fade in C3. 14-Feb-2004 11:06 NE Couple of faint ragged fronts. They fade in C3. 14-Feb-2004 12:54 N Faint narrow spray front. It fades close to the inner edge of C3. 14-Feb-2004 21:30 N Fairly faint elongated loop front with sharp cusp. 14-Feb-2004 22:06 NE Fairly faint ragged front. It fades throughout C3. ------------------------------------------------------------------------------------- 15-Feb-2004 03:54 SE Bright loop front with cavity and bright inner core. Gusty outflow follows at PA of the northern leg, with several discernible ragged and small bright fronts along the day. EIT/Fe XII observes a prominence eruption on SE starting at 03:13 UT. 15-Feb-2004 05:54 SE Faint ragged loop front extending slightly beyond northern leg of previous event. Not discernible in C3. 15-Feb-2004 11:54 NE Fairly faint and small ragged fronts. 15-Feb-2004 19:31 NE Fairly faint ragged front to N of previous event. ------------------------------------------------------------------------------------- 16-Feb-2004 04:30 E Bright ragged loop front brightest to N. 16-Feb-2004 05:30 SE Ragged faint front to S of previous event followed by bright smaller front at 06:54 UT and trailing material. 16-Feb-2004 07:31 NE Very faint spray front that fades throughout C2. 16-Feb-2004 23:54 W Wide and bright loop front with cavity. Twisted inner structure developing toward NW. By 01:31 UT on next day the CME spans ~ 147 deg in C2, from PA ~ 203 - 350 (fainter on SW), having its LE at ~ 4.80 solar radii (PA 290 deg). By ~ 05:54 UT a faint and faster front appears on NW and seems to push the material ahead (two events?). ------------------------------------------------------------------------------------- 17-Feb-2004 04:54 SW Very slow development of faint loops' system along streamer. By 09:30 UT inner structure begins to evolve. Difficult to give an exact time. At 16:54 UT narrow asymmetric loop front. Global development continues until beginning of next day. 17-Feb-2004 07:31 E Narrow jet-like front developing slightly toward NE. It vanishes close to the inner edge of C2. Extremely narrow ragged loop front follows to S at 07:54 UT. 17-Feb-2004 12:54 W Narrow ragged front fades throughout C2. It is preceded at 12:30 UT by a faint ragged loop front to N. 17-Feb-2004 14:30 SE Jet-like front followed at 17:30 UT by narrow ragged front that fades close to the inner edge of C3 FOV. 17-Feb-2004 20:06 W Fan-like front followed at 22:06 UT by bright thin and ragged front. 17-Feb-2004 20:30 SW Very faint loop front developing towards S. Difficult to determine precisely the time of first appearance. 17-Feb-2004 23:30 E Spray front developing toward NE. It fades in C3. ------------------------------------------------------------------------------------- 18-Feb-2004 00:06 SW Following event reported to occur at 04:54 UT on previous day, narrow ragged front, followed at ~ 03:06 UT by kind of reconexion event at ~ 3.60 solar radii. Material going out and also material falling down. Gusty outflow. 18-Feb-2004 07:31 W Faint fan-like front, not discernible in C3. 18-Feb-2004 18:08 NW Faint spray front preceded at 15:48 UT by a jet-like front. It fades throughout C2. 18-Feb-2004 18:54 E Ragged loop front and trailing material develops as a faint ballon-type CME, moving toward SE. It fades throughout C3. It is preceded by a faint ragged front to N that fades throughout C2. EIT records with very high cadence in Fe XII (Shutterless Mode) the eruption of a thin filament on the SE quadrant starting at ~ 15:45 UT. 18-Feb-2004 23:06 SW Faint ragged loop front. 18-Feb-2004 23:54 NW Narrow spray front. It fades throughout C2. ------------------------------------------------------------------------------------- 19-Feb-2004 02:54 SW Faint asymmetric ragged loop front follows event at 23:06 UT on previous day. 19-Feb-2004 05:55 SE Ragged loop front preceded by the slow development of a loops' system along the streamer. Extremely faint extensions over the S Pole to SW can be seen developing by the time. Moreover, by 13:54 UT a faint system of ragged loops can be seen in C2 spanning ~ 120 deg, from PA ~ 115 - 235. Difficult to discern whether they belong to the same event or is all part of a complex event. GOES B1.6 X-ray flare on S12E80 between 03:26 and 03:34 UT, just in between 2 EIT Fe XII images. The 'complex' event develops as a very faint partial halo CME. Observational evidence is not conclusive to determine its direction. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/237.html 19-Feb-2004 07:31 NE Rapid jet. It fades close to the inner edge of C2. 19-Feb-2004 10:30 E Very faint spray front. It fades throughout C2. 19-Feb-2004 15:30 SE Faint asymmetric ragged front, remnant of earlier event. 19-Feb-2004 18:30 SE Very bright, long, and fast spray front followed at 20:06 UT by a very narrow ragged and bright front slightly to N. 19-Feb-2004 21:30 W Spray front. It fades throughout C3. ------------------------------------------------------------------------------------- 20-Feb-2004 02:30 SE Fairly faint ragged asymmetric loop front to N of event at 18:30 UT on previous day, followed at 10:54 UT by another similar but smaller front. 20-Feb-2004 06:30 SW Extremely faint ragged front to S of streamer with fainter loop-shaped extensions over the streamer, on top of slow and continuos development of loops' system along the streamer all along the day. 20-Feb-2004 10:30 W Extremely faint and narrow spray front. It fades in C2. 20-Feb-2004 12:30 E Extremely faint ragged front. It fades in C2. 20-Feb-2004 14:30 S Faint narrow and long spray-like front. It fades in C2. ------------------------------------------------------------------------------------- 21-Feb-2004 00:06 SW Small ragged front followed by gusty outflow. 21-Feb-2004 06:54 NE Small ragged front slightly to S of a continuous gusty outflow (the gusty outflow, which continues into next day, is most probably related to activity on NOAA AR 10564). 21-Feb-2004 15:30 SW Faint ragged front developing toward S, to S of gusty outflow. It fades throughout C3. ------------------------------------------------------------------------------------- 22-Feb-2004 02:30 NE Faint ragged loop front. Barely discernible in C3. 22-Feb-2004 03:30 S Faint ragged loop front, followed at ~ 09:54 UT by another faint ragged front. At 12:30 UT material is seen falling down, starting at ~ 3.65 solar radii (PA ~ 186). 22-Feb-2004 09:54 NE Faint ragged front. 22-Feb-2004 15:30 W Bright asymmetric ragged loop front much brighter to N. 22-Feb-2004 17:54 W Bright loop front with cavity and inner core slightly to N of previous event, developing towards NW. Twisted trailing material. 22-Feb-2004 18:54 SW Small and faint ragged front going out, and small blob falling down. Separation point at ~ 3.1 solar radii (PA ~ 198). ------------------------------------------------------------------------------------- 23-Feb-2004 00:30 NE Fairly faint ragged front, close to E. Material is being pushed aside to N since earlier. Signatures fade out throughout C3. 23-Feb-2004 04:06 NW Elongated blob-like front. It fades throughout C3. 23-Feb-2004 05:06 NE Faint elongated ragged front. It fades close to the inner edge of C3. 23-Feb=2004 07:54 E Raged faint loop front developing slightly toward S followed at 09:30 UT on E Limb by another faint ragged front that develops as a faint and ragged elongated loop. Both barely visible in C3. 23-Feb-2004 12:30 SE Extremely faint ragged front developing toward SSE. 23-Feb-2004 17:06 N Ragged front. It fades throughout C3. 23-Feb-2004 22:30 NW Small ragged front. Barely visible in C3. ------------------------------------------------------------------------------------- 24-Feb-2004 02:30 N Extremely faint front (difficult to determine exactly time of first appearance). Expansion to NW. 'V-shaped' feature in C3 (09:18 UT), fading out throughout C3. 24-Feb-2004 08:06 W Narrow ragged loop front, not discernible in C3. 24-Feb-2004 12:06 E Very narrow ragged front developing towards SE. Barely visible in C3 only close to the inner edge. 24-Feb-2004 12:54 W Bright spray-like front. Filament eruption seen in EIT Fe XII images between 10:14 and 12:36 UT on SW quadrant. 24-Feb-2004 15:30 SW Bright loop front, cavity, and twisted inner structure, slightly to S of previous event. Filament eruption seen in EIT Fe XII images on SW quadrant at 14:36 UT. 24-Feb-2004 20:06 NE Faint spray-like front. It fades throughout C2. ------------------------------------------------------------------------------------- 25-Feb-2004 00:05 SW At the same PA as event on previous day at 15:30 UT an apparently faster and much fainter front develops, while the inner structure of that previous event is still under progress in C2 FOV, making it a complex event. Difficult to give an exact time of first appearance. Gusty outflow follows. 25-Feb-2004 02:30 N Extremely faint and elongated loop front developing toward NW. Despite its faintness, it can be discerned in C3 almost to the end of the FOV. 25-Feb-2004 15:30 N Extremely faint narrow loop front. It fades in C3. 25-Feb-2004 15:30 SW Narrow ragged front followed at 16:54 UT, slightly to N, by another ragged front. Trailing material well into next day. 25-Feb-2004 16:30 SE Faint loop front followed at 22:30 UT by another narrower loop front, from which the position of its southern leg matches that of the previous loop front. By the same time (22:30 UT), a ragged loop front, slightly to N, begins to fall down (apex at ~ 4.25 solar radii). The second front is barely visible in C3. ------------------------------------------------------------------------------------- 26-Feb-2004 02:06 N Diffuse faint front slightly to NW that quickly fades in C2. At 02:00 UT EIT Fe XII running difference images show a strong brightening in the NW quadrant (close to the central meridian) on AR 10564. No dimming is observed. Goes report a X1.1 X-ray flare on that AR between 01:50 UT and 02:10 UT with peak intensity at 02:03 UT. At 08:06 UT, a very faint and diffuse loop front can be guessed in C2 slightly above the occulter on the N Pole, fading out completely throughout C2. By that time, material can be seen pushed aside toward NW. 26-Feb-2004 04:30 E Following event reported to start at 16:30 UT on previous day, faint ragged loop front developing slightly toward S. 26-Feb-2004 05:06 SW Narrow ragged front in the trailing material of event reported to start at 15:30 UT on previous day, immediately followed by a faint loop front that develops more slowly. 26-Feb-2004 14:54 E Loop front that fades out close to the inner edge of C2, preceded by infalling blob slightly to S. 26-Feb-2004 18:30 SW Ragged front preceded by a slower ragged front at ~ 17:30 UT. 26-Feb-2004 23:30 E Very narrow ragged front preceded by a fainter one at 22:30 UT. ------------------------------------------------------------------------------------- 27-Feb-2004 06:06 SW Small and faint loop front precedes i) a faint ragged front that develops slightly to S starting at 11:30 UT, ii) a brighter ragged front at 13:54 UT, and iii) a diffuse and faint loop front to S at 16:54 UT. Gusty outflow. No clear front discernible in C3 FOV. 27-Feb-2004 07:31 E Bright and narrow spray front preceded by infalling material starting at ~ 3.25 solar radii at 02:30 UT, and by a jet-like front at 03:30 UT. It fades in C3. 27-Feb-2004 12:30 E Another narrow spray front that fades close to the inner edge of C3 FOV. ------------------------------------------------------------------------------------- 28-Feb-2004 03:54 NW Asymmetric diffuse loop front preceding diffuse loop front. Both features fade throughout C2. 28-Feb-2004 03:54 SE Ragged loop front with twisted inner structure, followed at 09:54 UT by a faster and bright spray-like front. Both events fade throughout C3. 28-Feb-2004 18:30 W Narrow ragged loop front that fades close to the inner edge of C3 FOV. It is followed at 22:30 UT by another small and faint ragged front, and at 23:30 UT, slightly to S, by another (brighter) one. ------------------------------------------------------------------------------------- 29-Feb-2004 00:54 W Ragged fronts continue: a fairly faint one at 00:54 UT, another ones at 02:30 UT and 04:30 UT, and a wider one at 06:54 UT. They all fade close to the inner edge of C3 FOV. 29-Feb-2004 04:30 E Small ragged front that fades in C2. 29-Feb-2004 12:06 SW Bright and wide loop front with cavity and inner core. At 12:00 UT EIT Fe XII running difference images show material ejected coming from behind the SW limb. At 16:30 UT, starting in C2 FOV at ~ 3 solar radii (PA ~ 213 deg) material is seen falling down. By that time a faint loop front develops. 29-Feb-2004 23:06 NW Very faint spray front. It fades in C2. ===================================================================================== 01-Mar-2004 03:30 SW Following event reported to start at 12:06 UT on previous day, another faint loop front develops toward S. Gusty outflow to N. 01-Mar-2004 05:54 NW Spray-like front. 01-Mar-2004 10:06 E Faint spray front developing toward SE, preceded at 09:30 UT by a small and narrow raggged front. Barely visible in C3. 01-Mar-2004 17:06 NE Extremely narrow and faint elongated asymmetric loop front. Barely visible in C3. 01-Mar-2004 18:30 N 'Curved' spray like front. Barely visible in C3. 01-Mar-2004 18:54 E Narrow ragged loop front developing toward SE, followed at 22:06 UT by jet-like front. It fades throughout C3. 01-Mar-2004 22:30 SW Ragged loop front. ------------------------------------------------------------------------------------- 02-Mar-2004 00:30 S Faint loop front. It fades throughout C3. 02-Mar-2004 01:54 SE Faint ragged loop front preceded by infalling material. It fades in C3. 02-Mar-2004 06:06 E Following event reported to start at 18:54 UT on previous day, jet-like front developing slightly toward S, preceded at 02:30 UT by a very faint jet-like front, and immediatly followed by another one at 06:54 UT. More narrow ragged fronts at 11:54, 13:31, and 14:54 UT. In C3 they are all only barely visible close to the occulter. 02-Mar-2004 13:31 SW Faint ragged front and trailing material. Difficult to give accurate time of first appearance. It fades throughout C3. 02-Mar-2004 22:30 SW Fairly faint ragged front developing toward SSW. C1.7 X-ray flare on NOAA AR 0567 at 21:49 UT, and another one (also C1.7) from the same region at 23:27 UT. Fainter ragged front follows at 00:30 UT on next day probably related to the latter flare. Both fronts fade close to the inner edge of C3. 02-Mar-2004 23:54 SE Bright ragged loop front, cavity, and complex twisted inner structure. At ~ 21:12 UT EIT Fe XII running difference images show CME coming out from behind SE limb. ------------------------------------------------------------------------------------ 03-Mar-2004 06:06 NE Bright spray-like front. EIT Fe XII running difference images show the event coming out from just behind the NE limb, starting at 05:36 UT. 03-Mar-2004 11:06 W Faint spray front followed at 12:06 UT slightly to N by a very faint ragged loop front developing towards NW that fades in C2. The faint spray fades close to the inner edge of C3. 03-Mar-2004 12:06 SE Very faint loop front that fades in C3. 03-Mar-2004 22:30 W Very narrow ragged front. It fades throughout C2. ------------------------------------------------------------------------------------- 04-Mar-2004 02:06 SE Very faint loop front. Brighter structure to N 'pushed' aside during development. 04-Mar-2004 12:06 SE Narrow and elongated ragged loop front followed at ~18:54 UT, slightly to S, by another narrow ragged front. The second front can be seen in C3 (though it fades out throughout C3 FOV), while the first one is barely discernible. 04-Mar-2004 15:54 W Bright and narrow ragged loop front followed at 19:31 UT by a similar one (though fainter and narrower). The first one fades in C3. 04-Mar-2004 18:54 S Slow development of very faint ragged front. 04-Mar-2004 22:30 N Ragged loop front preceded at 21:30 UT by a diffuse front extending slightly to NW (diffuse front not discernible in C3). EIT Fe XII images show the eruption of a filament between ~ 20:00 and 21:00 UT, which by the time was roughly located at 20 deg N latitude slightly W of the central meridian. ------------------------------------------------------------------------------------- 05-Mar-2004 04:54 NW Blob-like front starting at ~ 4.4 solar radii. 05-Mar-2004 05:30 SE Couple of fairly faint ragged fronts developing towards S. They fade close to the inner edge of C3. 05-Mar-2004 06:06 W Very faint ragged front. It fades throughout C2. 05-Mar-2004 15:30 W Elongated and diffuse loop front developing toward SW, followed at: i) ~ 17:30 UT, at the same PA, by another elongated loop front, and trailing material; ii) ~18:30 UT by a ragged front developing toward W; and iii) ~22:30 UT, slightly to N, by another ragged front. They all fade throughout C3. 05-Mar-2004 18:30 E Extremely narrow ragged front developing toward SE. It fades throughout C2. Follow several spray-like fronts slightly to S that fade very close to the inner edge of C3. In particular, at ~21:08, ~00:06, and ~04:30 UT, the last two on 2004/03/06. ------------------------------------------------------------------------------------- 06-Mar-2004 05:54 W Following event reported to start at 15:30 UT on previous day, ragged loop front followed at 09:54 UT by a jet-like front, and at 13:31 UT, slightly to S, by a bright spray front developing toward SW. The spray-like front is preceded at 11:54 UT by a diffuse ragged front that quickly fades. 06-Mar-2004 07:31 SW Ragged loop front developing toward S. 06-Mar-2004 20:06 SE Slow development of loops' system along streamer. Difficult to give accurate starting time. It continues into next day. 06-Mar-2004 20:30 S Ragged front followed at 22:06 UT by another ragged front to SW. Also by 22:06 UT over the S Pole a faint asymmetric twisted inner structure develops, fading throughout C3. ------------------------------------------------------------------------------------- 07-Mar-2004 06:06 W Ragged front developing slightly toward NW. It follows to S at 07:31 UT a bright ragged and diffuse front developing toward SW that fades throughout C3. 07-Mar-2004 09:54 SE Bright loop front followed by a complex inner structure. By ~09:00 UT EIT Fe XII running difference images show a CME apparently coming out from just behind the SE Limb. The event seems to disturb the slow development of the event reported to start at 20:06 UT on previous day. The resulting fronts are seen to extend over the SW limb, giving the appearance of a 'partial' halo CME. Gusty outflow well into next day. 07-Mar-2004 18:30 NE Ragged front and twisted structure slightly to N of previous event preceded by a jet-like front slightly to S at 15:54 UT. EIT Fe XII images show filament eruption (~N15E45) between 18:00 UT and 23:48 UT. ------------------------------------------------------------------------------------- 08-Mar-2004 00:30 S Very faint ragged loop front. Outflow afterward. B8.4 X-ray flare on NOAA AR 0567 (S14E62) at 23:03 UT on previous day (peak). More B-class X-ray flares on the same region at 07:30 and 08:20 UT. Large and faint extensions over SW. Difficult to establish whether they have conexion to the event. 08-Mar-2004 02:54 W Extremely narrow ragged front followed at 06:30 UT by another ragged front. They fade throughout C2. 08-Mar-2004 06:54 W Very faint loop front extending over SW (central axis at PA ~ 245). Between 05:36 and 09:38 UT, EIT Fe XII images show the development of a CME originating on NOAA AR 0569, which is located slightly W of the central meridian (~20 deg) at about 11 deg S latitude. 08-Mar-2004 23:06 W Ragged and faint asymmetric front. ------------------------------------------------------------------------------------- 09-Mar-2004 00:06 NW Faint narrow ragged front. It fades throughout C2. 09-Mar-2004 00:54 SW Faint and diffuse elongated front preceding several faint and diffuse 'half' loop fronts starting at ~04:06 UT developing toward S. Signatures compatible in EIT Fe XII running difference images, coming out from behind the SW limb. 09-Mar-2004 01:54 SE Bright ragged loop front. It fades throughout C3. Gusty outflow follows. 09-Mar-2004 01:54 W Jet-like front followed at 03:54 UT by another one. At 06:30 UT follows an initially small ragged front that develops as a fairly faint loop front (barely visible in C3). 09-Mar-2004 10:54 W Narrow ragged front. 09-Mar-2004 12:06 SW Faint narrow ragged front. It fades throughout C2. 09-Mar-2004 17:30 SE Bright ragged loop front and cavity. Trailing part not discernible due to event reported to start at 22:30 UT. Starting at ~ 16:24 UT EIT Fe XII running difference images show CME coming out from just behind the SE limb. **** LASCO data gap from 20:00 to 21:30 UT due to ICAL01 **** **** (intercalibration for EIT with CDS). **** 09-Mar-2004 21:30 NE Bright loop front, cavity, and twisted trailing material. Typical flux-rope event. Starting at ~ 21:24 UT (after data gap) EIT Fe XII running difference images show CME coming out from behind the NE limb. 09-Mar-2004 22:30 SE Bright loop front evolving almost in parallel with previous event. C3 images show the event to be slightly slower than the previous one. Difficult to give accurate time of first appearance due to event reported to start at 17:30 UT. No visible signatures in EIT Fe XII running difference images. 09-Mar-2004 22:30 NW Slow development of a narrow system of loops. Twisted inner structure begins to be discernible at ~ 06:30 on next day. By ~14:00 UT, streamer blowout. ------------------------------------------------------------------------------------- 10-Mar-2004 05:54 W Ragged front. Infalling material starting at ~ 4.35 solar radii at ~08:54 UT. 10-Mar-2004 09:06 SE Bright ragged front with twisted trailing material. Slow development of a loops' system behind since earlier. Starting at around 09:00 UT EIT Fe XII running difference images show CME coming out from just behind the SE limb. 10-Mar-2004 16:30 SW Narrow ragged front. Barely visible in C3. 10-Mar-2004 17:54 E Bright narrow ragged front. It fades close to the inner edge of C3. 10-Mar-2004 19:31 S Faint and apparently twisted feature. 10-Mar-2004 19:31 SE Couple of loop fronts that fade throughout C2. Outflow well into next day. ------------------------------------------------------------------------------------- 11-Mar-2004 07:31 NE Diffuse and very faint front extending all over the N Pole up to the NW limb showing a very slow development. It is first seen in C3 at 16:18 UT. No likely related signatures visible in EIT Fe XII images. 11-Mar-2004 11:06 W Small ragged front jointly with a jet-like front. They fade throughout C2. 11-Mar-2004 17:06 SE Bright ragged loop front and trailing material (difficult to give precisely the time of first appearance). At 19:42 UT is first seen in C3, moving much faster than the event reported to start at 07:31 UT. Both events together give the appearance of a 'partial' halo CME. Gusty outflow well into next couple of days. 11-Mar-2004 19:31 W Extremely faint front barely visible in C2. EIT Fe XII running difference images show CME coming from just behind the W Limb at around 19:13 UT. A very narrow ragged front slightly to S developing toward SW, appears in C2 FOV at 20:06 UT. 11-Mar-2004 20:30 N Faint and wide loop front. ------------------------------------------------------------------------------------- 12-Mar-2004 00:30 NE At PA of the leg on the NE limb of previous event, a faint asymmetric loop front develops. Blob-like front follows at ~ 08:30 UT. 12-Mar-2004 00:30 NW Extremely faint and diffuse front moving faster than a bright ragged front following at ~ 01:31 UT. Due to the superposition of both events on the line of sight, it is difficult to give an accurate time of first appearance for the second event. Huge twisted structure follows. EIT HE II images show the eruption of a a huge prominence coming out from behind the NW limb (first seen at 19:19 UT on previous day, next image at 01:19 UT). 12-Mar-2004 05:30 NE Faint ragged loop front at PA of the southern leg of the asymmetric loop front reported to start at 00:30 UT developing to S of such event. Several faint ragged fronts follow starting at ~ 12:06 UT. Gusty outflow well into next day. 12-Mar-2004 16:54 W Faint ragged loop front developing towards NW. At ~ 20:06 UT follows blob-like front slightly to N, starting at roughly 4 solar radii. ------------------------------------------------------------------------------------- 13-Mar-2004 08:06 SW Extremely faint ragged loop front. It fades in C2. ------------------------------------------------------------------------------------- 14-Mar-2004 02:06 W Extremely faint and small blob-like front going outward and small feature falling down. Starting point at ~ 4.30 solar radii (PA ~ 263 deg). It is followed at ~ 09:06 by an extremely faint ragged front. 14-Mar-2004 03:54 NE Couple of very faint ragged loop fronts, one of them developing more toward N. 14-Mar-2004 07:31 N Jet-like front that quickly fades. 14-Mar-2004 13:31 SW Narrow and diffuse front preceding asymmetric loop front at ~ 15:30 UT. ------------------------------------------------------------------------------------- 15-Mar-2004 09:30 NW Ragged front and twisted trailing material. EIT Fe XII images show filament eruption (slightly NE of NOAA AR 0572) between 07:36 and 11:48 UT; the ejecta is seen to departs at 08:48 UT. 15-Mar-2004 16:30 SE Ragged front followed by several small ragged fronts well into next day. Difficult to give accurate starting time due to gusty outflow since earlier in the day. Faint big twisted structure develops at the begining of next day slightly S of small fronts. 15-Mar-2004 17:06 E Faint narrow and diffuse loop front developing toward NE. ------------------------------------------------------------------------------------- 16-Mar-2004 04:54 W Ragged front developing toward SW, preceded by a couple of jets at 20:54 (previous day) and 00:30 UT, and a faint spray front at 04:30 UT. It is followed at 07:54 UT by another (narrower) ragged front. 16-Mar-2004 07:31 E Another very faint narrow and diffuse loop front developing toward NE. 16-Mar-2004 16:30 NW Bright loop front, cavity, and core. Twisted trailing material. By ~ 13:25 UT EIT Fe XII images show the starting of a filament eruption, part of which is located slightly SW of NOAA AR 0572, very close to the limb; the rest of it, seems to extend up to behind the limb. By 18:30 UT very faint extensions begin to be discernible over the C2 SW limb, and S Pole up to the S East limb giving the appearance of a 'partial' halo CME. Relation to the event not clear, if any. 16-Mar-2004 18:36 SE Between 18:36 and 19:13 UT, EIT Fe XII images show the eruption of a low-lying filament at the SE limb. No clear signatures of the event can be discerned in C2, except for the gusty outflow, the faint extensions mentioned in the previous event, and/or a faint and elongated loop barely discernible at ~ 19:54 UT, already in progress. 16-Mar-2004 23:30 NW Bright narrow and elongated ragged loop front. Gusty outflow into next day. By ~ 22:36 UT Fe XII running difference images show an extremely faint signature of a CME coming out apparently from behind the NW limb. ------------------------------------------------------------------------------------- 17-Mar-2004 02:30 W Faint ragged loop front developing slightly toward SW. 17-Mar-2004 09:54 NW Bright loop front with twisted core. Gusty outflow follows. C1.6 X-ray flare on NOAA AR 0572 (N21W66) at 09:31 UT (peak). 17-Mar-2004 12:06 E Faint spray-like front. At ~ 15:30 UT follows couple of faint fronts. They all fade throughout C3. 17-Mar-2004 17:54 NW Slow faint ragged front and twisted structure. 17-Mar-2004 20:54 SW Narrow ragged loop front slightly to N of streamer. Barely visible in C3. By that time, outflow within the streamer. ------------------------------------------------------------------------------------- **** No EIT data 2004/03/18 - 2004/04/04. **** **** (EIT in CCD bakeout mode). **** 18-Mar-2004 01:37 E Narrow, and asymmetric ragged loop front developing slightly toward NE. Very faint in C3. 18-Mar-2004 07:00 NE Very faint ragged front barely discernible in the gusty outflow along the streamer. At 08:00 UT faint and small spray front slightly to S of streamer. Both events fade throughout C2. 18-Mar-2004 08:00 E Very faint narrow and ragged front. Another one at ~12:00 UT. Ragged loop front at 09:20 UT slightly to N. All events fade in C2. 18-Mar-2004 12:00 NW Ragged front and trailing structure along streamer. 18-Mar-2004 16:20 SW Big bright loop front and twisted inner structure. Gusty outflow. 18-Mar-2004 16:40 SE Narrow spray-like front. Barely visible in C3. ------------------------------------------------------------------------------------- **** Only partial LASCO data 2004/03/19 - 2004/04/04 due **** **** to intermittent contact during telemetry keyhole. **** **** Most likely some events missed. **** 19-Mar-2004 03:20 NE Ragged front along streamer. It fades throughout C3. 19-Mar-2004 06:20 SW Faint and diffuse loop front slightly to S of event at 16:20 UT on previous day. 19-Mar-2004 10:41 SW Bright loop front and inner core to N of previous event. Gusty outflow. 19-Mar-2004 12:00 E Faint and very narrow ragged front developing slightly toward SE. It fades in C2. 19-Mar-2004 17:20 NW Spray-like front. It is followed at ~ 20:40 UT by a ragged and fainter front. 19-Mar-2004 20:40 SE Faint and elongated ragged loop front. ------------------------------------------------------------------------------------- **** LASCO Data Gap on 20-Mar-2004: 00:20 - 02:00 UT **** 20-Mar-2004 06:40 NE Faint and diffuse front slightly S of streamer. **** LASCO Data Gap on 20-Mar-2004: 07:40 - 11:40 UT **** 20-Mar-2004 18:40 SW Ragged loop front preceded at ~ 16:40 by a fainter and smaller ragged front. Infalling material slightly to S starting at ~ 19:40 UT at ~ 4 solar radii (PA ~ 220 deg). 20-Mar-2004 20:40 E Faint spray front. It fades in C2. ------------------------------------------------------------------------------------- **** LASCO Data Gap on 21-Mar-2004: 00:00 - 02:40 UT **** 21-Mar-2004 03:20 SW Ragged loop front. Twisted trailing material already in progress after next data gap. **** LASCO Data Gap on 21-Mar-2004: 05:20 - 14:00 UT **** 21-Mar-2004 14:00 SW Wide and faint ragged loop fronts already in progress spanning almost the whole SW quadrant. 21-Mar-2004 16:20 E Faint spray-like front developing toward SE. It fades throughout C2. 21-Mar-2004 19:00 NW Extremely faint spray-like front that fades in C2. 21-Mar-2004 22:00 W Ragged and narrow loop front developing toward SW. ------------------------------------------------------------------------------------- **** LASCO Data Gap on 22-Mar-2004: 02:40 - 08:20 UT **** 22-Mar-2004 09:20 NE Ragged loop front, and bright and elongated feature superimposed on the LOS. **** LASCO Data Gap on 22-Mar-2004: 11:40 - 18:57 UT **** 22-Mar-2004 19:33 SW Ragged front already in progress after data gap. ------------------------------------------------------------------------------------- **** LASCO Data Gap on 23-Mar-2004: 01:00 - 04:20 UT **** 23-Mar-2004 04:40 E Very faint and diffuse loop front already in progress after data gap developing slightly toward NE. It fades in C2. 23-Mar-2004 10:41 SW Extremely faint ragged loop front. It fades in C2. **** LASCO Data Gap on 23-Mar-2004: 20:40 - 24:00 UT **** ------------------------------------------------------------------------------------- **** LASCO Data Gap on 24-Mar-2004: 00:00 - 04:00 UT **** **** LASCO Data Gap on 24-Mar-2004: 04:20 - 08:00 UT **** 24-Mar-2004 08:00 W Extremely faint asymmetric ragged loop front already in progress after data gap developing towards SW. Very faint in C3. **** LASCO Data Gap on 24-Mar-2004: 12:40 - 16:20 UT **** 24-Mar-2004 17:00 N Ragged loop front and apparently twisted trailing structure developing toward NW. It is preceded at 16:20 UT by a fainter ragged front at the N Pole that quickly fades out. An extremely faint front can be guessed in C2 by ~ 17:00 UT farther out of the front, extending up to the W limb (no signatures in C3). **** LASCO Data Gap on 24-Mar-2004: 22:20 - 24:00 UT **** ------------------------------------------------------------------------------------- **** LASCO Data Gap on 25-Mar-2004: 00:00 - 01:20 UT **** 25-Mar-2004 01:40 N At the same PA as event on previous day, very faint and ragged front already in progress after data gap developing toward NW. 25-Mar-2004 03:40 SW Faint ragged front starts developing. Evolution could not be tracked because of following data gap. **** LASCO Data Gap on 25-Mar-2004: 05:20 - 09:00 UT **** 25-Mar-2004 14:40 E Very narrow ragged front accompanied by an extremely faint loop front to S that quickly fades in C2. 25-Mar-2004 15:40 W Wide asymmetric loop front (extensions all over the NW limb). 25-Mar-2004 18:40 SW Couple of bright and small (and narrow) ragged fronts along streamer. Gusty outflow well into next day. 25-Mar-2004 21:17 NE Bright and very narrow spray-like front closer to E limb. It fades close to the inner edge of C3. Very faint and apparently slower front to S that fades in C2. ------------------------------------------------------------------------------------- 26-Mar-2004 04:40 E Faint and narrow spray front. It fades in C2. 26-Mar-2004 05:40 SW Faint ragged loop front at PA coincident with that of the small ragged fronts on previous day (PA ~240) **** LASCO Data Gap on 26-Mar-2004: 07:00 - 09:20 UT **** 26-Mar-2004 09:20 SE Faint ragged loop front that quickly fades in C2. **** LASCO Data Gap on 26-Mar-2004: 11:00 - 15:00 UT **** 26-Mar-2004 15:20 SW Ragged loop front already in progress after data gap. Gusty outflow continues into next day. 26-Mar-2004 20:20 SW Narrow ragged loop front to S of previous event. **** LASCO Data Gap on 26-Mar-2004: 21:40 - 24:00 UT **** ------------------------------------------------------------------------------------- 27-Mar-2004 00:40 SE Bright, small and elongated feature, followed at 05:20 UT by a similar one. Extremely faint ragged front develops by the time of the latter, fading in C2. 27-Mar-2004 00:40 NE Faint ragged loop front along streamer already in progress. Barely visible in C3. By the time, a faint and narrow ragged front apparently evolving much faster than the ragged loop front develops slightly to S. **** LASCO Data Gap on 27-Mar-2004: 07:20 - 14:00 UT **** 27-Mar-2004 14:20 NE Faint loop front already in progress after data gap. Another faint loop front starts developing. 27-Mar-2004 17:40 SE Bright ragged loop front close to the E limb, immediately preceded by a small and elongated feature similar to that one reported at 00:40 UT. Infalling material by the time, slightly to S. ------------------------------------------------------------------------------------- 28-Mar-2004 00:00 E Slow evolution of an apparently twisted feature. At 04:40 UT a brighter ragged front appears superimposed in the LOS. After the following data gap, the complex event is seen in C3 to develop as a big ragged loop front with structured interior. **** LASCO Data Gap on 28-Mar-2004: 05:20 - 09:20 UT **** 28-Mar-2004 10:00 E Loop front slowly develops behind previous event. The resulting complex event (streamer blowout) extends toward SE latitudes as it develops. **** LASCO Data Gap on 28-Mar-2004: 12:40 - 15:20 UT **** 28-Mar-2004 15:20 SW Couple of ragged loop fronts already in progress after data gap. 28-Mar-2004 19:40 NE Fairly faint and diffuse loop front. It fades close to the inner edge of C3. ------------------------------------------------------------------------------------- 29-Mar-2004 00:20 NE Narrow ragged loop front followed by a couple more at ~ 07:40 (already in progress after data gap) and 10:00 UT. 29-Mar-2004 00:40 SW Bright loop front, strong cavity, and twisted inner core. 29-Mar-2004 01:00 SE Bright spray-like front. In C2 FOV, an extremely faint asymmetric loop front further out seems to accompany the spray front. It can also be discerned in C3 after the following data gap. **** LASCO Data Gap on 29-Mar-2004: 03:20 - 07:40 UT **** 29-Mar-2004 08:00 SE Spray-like front already in progress after data gap. Also couple of ragged fronts roughly above the E Limb, already in progress. **** No LASCO data between ~ 11 UT on 2004/03/29 and **** **** ~ 20 UT on 2004/03/31 due to spacecraft maneuvers **** **** on 2004/03/30, consisting of station keeping, **** **** momentum management, and 180 deg roll. **** ------------------------------------------------------------------------------------- **** LASCO resumes operation on 2004/03/31 at ~ 20:00 UT **** **** after S/C maneuvers on 2004/03/30. **** 31-Mar-2004 21:48 NE Ragged front already close to the outer edge of C2 FOV. 31-Mar-2004 21:48 N Ragged front developing towards NE. Faint extension over the N Pole to NW. As the event develops, a long and thin feature is seen to be pushed toward NE. 31-Mar-2004 21:53 HALO Full halo CME already in progress. Time of C3. GOES recorded several C-class X ray flares during the day on NOAA AR 10582. A time extrapolation based on the average speed measured for the halo CME (~220 km/s at PA 239) makes the C2.8 X-ray flare occurred on that AR (located N11W12) between 15:07 and 15:17 UT with peak emission at 15:11 UT likely related to the event. Therefore, the halo CME has been be catalogued as most probably frontsided. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/238.html ===================================================================================== **** LASCO Data Gap on 01-Apr-2004: 05:00 - 08:20 UT **** **** LASCO Data Gap on 01-Apr-2004: 12:00 - 21:20 UT **** 01-Apr-2004 21:40 SE Slow development of system of faint loops along streamer. 01-Apr-2004 23:05 NE Bright loop front, cavity and twisted core. Typical 'flux rope' event. Mean plane-of-sky speed at PA ~56: 425 km/sec, showing slight acceleration (based on C2 data). ------------------------------------------------------------------------------------- 02-Apr-2004 03:00 SE Ragged front slightly to N of event reported to start at 21:40 UT on previous day, and much faster. 02-Apr-2004 04:40 NE Small ragged front in the trailing material of the 'flux-rope' event reported to start at 23:05 UT on previous day. Another one at 07:20 UT. 02-Apr-2004 10:41 NE Faint ragged loop front. Development missed because of following data gap. Trailing material after data gap well into next day. **** LASCO Data Gap on 02-Apr-2004: 13:20 - 22:20 UT **** 02-Apr-2004 23:20 SW Ragged front and trailing material already in progress after data gap. It fades throughout C3. ------------------------------------------------------------------------------------- 03-Apr-2004 02:20 W Faint asymmetric ragged loop front. Similar front follow at 03:40 UT, developing slightly to SW. 03-Apr-2004 08:00 NE Ragged asymmetric front. Difficult to give an exact time of first appearance. 03-Apr-2004 11:00 SE Bright ragged front. **** LASCO Data Gap on 03-Apr-2004: 16:00 - 24:00 UT **** ------------------------------------------------------------------------------------- 04-Apr-2004 00:40 SE Ragged loop front already in progress after data gap, close to the edge of C2 FOV. 04-Apr-2004 01:20 SE Ragged front preceded at 00:40 UT by a smaller and brighter (and apparently slower) front. **** LASCO Data Gap on 04-Apr-2004: 04:00 - 07:00 UT **** 04-Apr-2004 08:00 W Small ragged front. It fades throughout C3. 04-Apr-2004 12:20 SE Faint ragged loop front. 04-Apr-2004 16:20 SW Couple of fairly faint ragged fronts. They fade throughout C3. 04-Apr-2004 16:40 SE Bright loop front and apparently twisted trailing material. 04-Apr-2004 17:00 N Fairly faint and apparently twisted structure developing toward NE. Difficult to giva an exact time of first appearance. **** End of EIT CCD bakeout **** ------------------------------------------------------------------------------------- **** SOHO out of telemetry keyhole **** **** High rate telemetry recovered **** 05-Apr-2004 01:31 W Faint spray-like front followed at 03:54 UT by another spray-like front slightly fainter. 05-Apr-2004 02:54 SE Ragged loop front slightly to N of event at 16:40 UT on previous day. At ~04:06 UT it is followed by a brighter loop front at PA that matches that of its southern leg. At ~01:13 UT a CME is seen in EIT Fe XII running difference images coming out from just behind the SE limb, while at ~04:00 UT a fine prominence close to the SE limb is seen to partially erupt. 05-Apr-2004 06:06 SE Bright and wide loop front rising on the SE limb that by 07:31 UT surpasses by the ragged loop front reported to start at 02:54 UT (already close to the end of C2 FOV). The bright loop front spanned in C2 ~103 deg from PA 83 - PA 186 by that time. However, faint extensions to NW and SE could be seen, giving the appearance of a partial (almost full) halo CME in C2 FOV. The mean plane-of-sky speed, based on C2 and C3 data, was 573 km/s at PA 145, showing slight deceleration. GOES reported a M1.7 X-ray flare on NOAA AR 0588 between 05:37 and 06:13 UT with peak emission at 05:55 UT (S18E35), which was related to the event. For more details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/239.html 05-Apr-2004 19:31 NW Faint ragged blob-like front along streamer. 05-Apr-2004 21:08 SE Narrow ragged loop front in the trailing material of event reported to start at 06:06 UT. ------------------------------------------------------------------------------------- 06-Apr-2004 00:30 W Spray-like front developing slightly toward SW, followed by a couple of faint ragged spray fronts (e.g., 04:54 UT, 09:30 UT). They all fade in C3. 06-Apr-2004 06:06 S Very faint spray-like front developing slightly toward SW. It fades throughout C2. 06-Apr-2004 08:30 S Extremely faint spray-like front developing slightly toward SE. It fades throughout C2. 06-Apr-2004 11:30 W Fairly faint ragged front developing slightly toward NW. Only barely visible in C3, close to the inner edge. 06-Apr-2004 13:31 HALO Bright loop front appears above SE limb; by 14:06 UT the front has developed into a full halo CME, though rather faint in the NW. The front first appeared in C3 images at 14:18 UT with full coverage of the C3 occulting disk by 15:18 UT. The mean plane-of-sky speed at PA 163 was 1075 km/s showing a slight positive acceleration in C2 FOV and a slight deceleration in C3 FOV. Most probably associated with a M2.4 X-ray flare that GOES records from AR 0588 (by the time at S18E15) between 12:30 - 13:46 with peak emission at 13:28 UT. Clear signatures of the event in EIT Fe XII running difference images between 12:36 and 15:48 UT, the flare peaking at 13:25 UT.For more details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/240.html 06-Apr-2004 20:06 S Faint and diffuse loop front, immediately preceded by another faint front slightly to SE that quickly fades. 06-Apr-2004 22:06 W Faint ragged front developing slightly toward SW. It fades in C3. 06-Apr-2004 23:54 W Spray-like front developing slightly toward NW. It fades in C2. ------------------------------------------------------------------------------------- 07-Apr-2004 15:30 W Ragged loop front brighter to N, followed at 18:06 UT, slightly to S, by another ragged front with twisted trailing material. They both fade throughout C3. 07-Apr-2004 21:54 W Ragged loop front developing slightly to N of previous event. It fades throughout C2. ------------------------------------------------------------------------------------- 08-Apr-2004 02:06 W Wide and initially bright ragged loop front. It spans by 04:06 UT ~ 100 deg from PA 225 to PA 325. 08-Apr-2004 02:54 E Spray-like front developing slightly toward NE followed at 03:54 UT by an asymmetric ragged loop front. They fade close to the inner edge of C3. At 04:06 UT a ragged loop front starts developing at PA coincident with that of the northern leg of the spray front. 08-Apr-2004 04:30 NE Extremely narrow ragged front (jet-like). IT fades throughout C2. 08-Apr-2004 06:30 W Bright ragged loop front and twisted structure. 08-Apr-2004 10:30 HALO Bright loop front in the SSE; by 11:06 UT the front develops into a full halo CME, though much fainter in the northern hemisphere. The front first appeared in C3 images at 10:42 UT, though just slightly visible. Full coverage of the C3 occulting disk occurs by 12:18 UT. The mean plane-of-sky speed at PA 197 was 915 km/s (based only in C3 data) showing a slight deceleration. The event is related to a C7.4 X-ray flare that GOES records from AR 0588 (by the time at S15W11) between 09:53 - 10:47 UT with peak emission at 10:19 UT. Signatures of the event in EIT Fe XII running difference images between approximately 09:48 and 12:48 UT. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/241.html 08-Apr-2004 11:30 W Another bright ragged loop front. 08-Apr-2004 13:31 SW Another bright loop front develops at roughly the same PA where the halo event first appeared in C2. This event is likely related to a C1.3 X-ray flare registered by GOES, that occurred on the same AR between 13:05 and 13:35 UT with peak emission at 13:20 UT. The flare was also well imaged by EIT in Fe XII starting at around 13:13 UT. 08-Apr-2004 18:54 W Ragged front that fades throughout C2. A narrow and faster front develops at PA coincident with that of the southern leg of the ragged front, shaped as a narrow loop in C3 FOV, where finally fades. 08-Apr-2004 20:06 E Ragged loop front developing slightly toward SE. It fades close to the inner edge of C3 FOV. ------------------------------------------------------------------------------------- 09-Apr-2004 00:30 W Ragged front that quickly fades. 09-Apr-2004 04:30 NE Couple of ragged loop fronts almost superimposed in the LOS in C2. 09-Apr-2004 09:54 E Faint ragged front developing toward SE that fades in C2. It is followed to SE at 12:54 by a spray-like front moving much faster, that fades close to the inner edge of C3 FOV. 09-Apr-2004 11:54 SW Very narrow asymmetric loop front. It fades in C2. 09-Apr-2004 20:30 SW Bright ragged loop front. By 21:54 UT clear faint extensions can be seen spanning approximately 260 deg, from PA 100 - 360. The front is first seen at 21:08 UT in C3. The mean plane-of-sky speed was ~940 km/s at PA 211 as measured on C3 data. NOAA AR 0588 (by the time at S16W29) produced a C2.8 X-ray between 20:13 and 21:02 UT with peak emission at 20:40 UT, which was associated with the 'partial', almost 'full', halo CME. See also end of: http://lasco-www.nrl.navy.mil/mail/halo_mail/242.html ------------------------------------------------------------------------------------- 10-Apr-2004 00:54 SW Bright ragged loop front with apparently twisted trailing part, followed at 02:30 UT on W limb by a very faint diffuse loop front that quickly fades. 10-Apr-2004 03:54 N Bright asymmetric ragged loop front and apparently twisted structure superimposed in the LOS and trailing material. 10-Apr-2004 08:06 SW Ragged spray-like front slightly to N of event reported to start at at 00:54 UT. 10-Apr-2004 17:54 SW Faint and narrow spray-like front. 10-Apr-2004 19:31 SW Ragged loop front slightly to N of previous event. It fades throughout C3. 10-Apr-2004 21:54 E Very faint and diffuse ragged front developing slightly toward SE. It fades throughout C2. 10-Apr-2004 23:06 NE Ragged front followed at 23:30 UT by another (brighter) front with twisted trailing structure. ------------------------------------------------------------------------------------- 11-Apr-2004 04:30 SW Very bright loop front above the SW limb develops as a 'partial' halo CME. By 06:30 UT the front spans in C2 ~290 deg, from PA 70 - 360. The front first appeared in C3 images at 05:18 UT as a thick and bright loop front, the bulk of the ejecta developing mainly toward SW. The mean plane-of-sky speed at PA 240 was 1454 km/s (based only in C3 data) and showing a slight deceleration. The CME was associated with an isolated C9.6 X-ray flare that GOES records from AR 0588 (by the time at S16W46) between 03:54 - 04:35 UT with peak emission at 04:19 UT. Starting at ~04:12 UT EIT Fe XII running difference images show a CME signature coming out from that AR and developing toward SW. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/242.html 11-Apr-2004 11:54 HALO Very bright loop front above the NW limb. By 13:54 UT the front has the appearance of an asymmetric full halo CME in C2 FOV, though extremely faint on the SE limb. The front first appeared in C3 images at 12:18 UT as a thick and bright loop front, the bulk of the ejecta developing mainly toward WNW. By 15:42 UT the C3 occulting disk is completely covered. The mean plane-of-sky speed at PA 291 was 1184 km/s (based only in C3 data) and showing a slight deceleration. No X-ray event is recorded by GOES by the time. EIT Fe XII running difference images show signatures of a big CME coming out from behind the disk (all above the west limb) starting at 11:36 UT. Therefore, backsided event. Trailing structures and gusty outflow well into next day on NW. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/243.html 11-Apr-2004 20:30 SE Extremely narrow ragged loop front (jet-like). 11-Apr-2004 23:30 SW Narrow ragged loop front. It fades in C3. ------------------------------------------------------------------------------------- 12-Apr-2004 00:30 SE Very narrow ragged loop front. 12-Apr-2004 00:54 SW Faint asymmetric loop front extending up to above W limb, immediately after the narrow ragged loop front reported to start at 23:30 UT on previous day. It fades throughout C3. 12-Apr-2004 09:54 SW Ragged (spray-like) loop front. Gusty outflow well into next day. 12-Apr-2004 11:06 E Ragged front (spray like). It fades in C3. It is followed at 14:30 UT by a very narrow ragged loop front (to S) and at 15:54 UT by a faint spray-like front, both fading very close to the inner edge of C3 FOV. 12-Apr-2004 12:54 NE Faint asymmetric loop front. It fades in C3. 12-Apr-2004 20:06 NW Ragged front preceding the slow development of structured (twisted) feature early on next day (*). 12-Apr-2004 21:30 E Ragged loop front with apparently twisted trailing structure developing slightly toward SE. It fades in C3. ------------------------------------------------------------------------------------- 13-Apr-2004 00:30 NW Slow development of structured (twisted) feature since late on previous day (*). Difficult to give an exact time of first appearance. Gusty outflow slightly to N. 13-Apr-2004 05:54 NE Fairly bright loop front. 13-Apr-2004 10:54 SE Ragged and elongated assymetric loop front. It fades throughout C3. 13-Apr-2004 11:30 SW Ragged spray-like front slightly to N of gusty outflow. It fades throughout C3. 13-Apr-2004 21:26 SW Wide ragged loop front. EIT Fe XII shows the eruption of a fine filament (located to SE of NOAA AR 0588) starting at around 19:25 UT, which could be related to the CME seen in C2. Afterward, a CME signature traveling toward SW can be seen in EIT Fe XII running difference images. They also show material comimg out from NOAA AR 0588 (by the time at the limb) starting at around 02:00 UT on next day. ------------------------------------------------------------------------------------- 14-Apr-2004 00:26 NE Slow development of system of loops along the streamer. Difficult to give an exact time of first appearance. By ~ 07:27 UT a very asymmetric loop front starts developing first distinguished along the streamer (though the starting time is again very difficult to determine). By 11:50 UT is clearly seen, one leg along the streamer on NE (front already at the end of C2 FOV), the other on the NW limb. The north eastern part exits C3 FOV by 23:18 UT. Backsided event. 14-Apr-2004 01:27 SE Asymetric ragged loop front, at PA that matches that of the leg on SSE of the wide ragged loop front reported to start at 21:26 UT on previous day. It is preceded by a similar front (though smaller) at ~22:26 UT on previous day. Twisted trailing material. 14-Apr-2004 05:26 SE Spray-like front slightly to N of previous event. 14-Apr-2004 16:26 SW Relatively bright small feature along streamer. 14-Apr-2004 18:26 E Spray-like front developing toward SE. It is barely visible in C3, only close to the inner edge. 14-Apr-2004 20:26 S Narrow spray ragged front developing slightly toward SE. It fades throughout C2. 14-Apr-2004 21:26 NW Elongated (and faint) ragged loop front at PA that matches that of the leg on NW of the big asymetric loop that was reported to start developing at ~07:27 UT. 14-Apr-2004 22:26 SW Bright ragged fan-like front. It fades throughout C3. 14-Apr-2004 23:06 NE Ragged loop front at PA that matches that of the leg on NE of the big asymetric loop that was reported to start developing at ~07:27 UT. Gusty outflow well into next day. ------------------------------------------------------------------------------------- 15-Apr-2004 03:26 SW Spray-like front. It fades throughout C3. 15-Apr-2004 08:06 SW Bright narrow ragged front along streamer, slightly to S of previous event. It fades throughout C3. 15-Apr-2004 08:06 NW Loop front that quickly fades. At 08:26 UT a bright ragged front appears at the PA of the northern leg of the loop, moving much faster. It also fades througout C3. 15-Apr-2004 11:06 NE Very ragged front in the gusty outflow, preceded at ~07:27 UT by an elongated ragged front barely discernible from the gusty outflow. 15-Apr-2004 17:26 W Ragged front and apparently twisted trailing structure developing slightly toward NE. 15-Apr-2004 18:06 N Very faint diffuse loop front that quickly fades. 15-Apr-2004 20:06 E Fairly faint and diffuse loop front, that fades close to the inner edge of C3. A fainter one developing toward SE can be distinguished since 20:50 UT. It fades by the end of C2 FOV. **** At 21:18 UT on 2004/04/15 Comet Bradfield (C/2004 F4) **** **** first appears in C3 FOV, coming in from S. **** ------------------------------------------------------------------------------------- **** Special observing campaign during 2004/04/16 - 2004/04/20. **** **** Synoptic observations were modified during that period. **** 16-Apr-2004 17:08 SW Spray-like front that fades close to the inner edge of C3. 16-Apr-2004 18:42 NE Very faint and elongated ragged loop front. Gusty outflow continues well into next day. 16-Apr-2004 20:08 E Apparently twisted structure limited to N by a bright feature that first appears at ~18:42 UT. It is followed at 23:08 UT by a slightly brighter front and also trailing twisted structure. The bright limiting feature to N is pushed toward N as the event develops. ------------------------------------------------------------------------------------- **** LASCO/EIT Data Gap on 17-Apr-2004: ~ 05:00 - 21:00 UT **** ------------------------------------------------------------------------------------- 18-Apr-2004 00:42 NW Ragged asymmetric loop front. It fades throughout C2. 18-Apr-2004 04:42 E Spray like front preceding twisted structure. They both fade throughout C3. 18-Apr-2004 14:08 W Faint ragged spray front developing slightly toward N. It is followed at 16:42 by a fairly faint and diffuse front to S. By 20:08 UT another faint spray front develops behind the one at 14:08 UT. By the time a very faint loop front develops on the SW quadrant. Very difficult to determine exactly the time of first appearance for the events mentioned. ------------------------------------------------------------------------------------- 19-Apr-2004 02:08 W Ragged assymetric front developing slightly toward NW followed at ~04:42 by another one. By 05:42 UT infalling material on SW. By 07:42 UT, a faint loop develops at the PA of the infalling material. Structured outflow along the day all above W limb. **** LASCO Data Gap on 18-Apr-2004: 18:42 - 21:42 UT **** 19-Apr-2004 22:08 E Ragged front already in progress after data gap. It fades throughout C3. Another (fainter) one developing towards NE. ------------------------------------------------------------------------------------- **** At 04:54 UT on 2004/04/20 Comet Bradfield (C/2004 F4) **** **** exits C3 FOV (upper right). Tail still visible. **** 20-Apr-2004 05:08 SW Ragged loop front and trailing material. Faint extension over the S Pole just at the beginning in the form of a diffuse front that quickly fades. EIT Fe XII running difference images show signatures of the event over the SW limb, coming out from behind the disk. 20-Apr-2004 09:42 NW Big ragged loop front with twisted inner structure. 20-Apr-2004 10:08 E Elongated ragged front. At 09:42 UT a diffuse front precedes it, fading pretty quickly. Apparently twisted trailing material. It fades in C3. Tops of post-CME arcade visible over the ESE limb by 09:00 UT in EIT Fe XII running difference images. Barely backsided. 20-Apr-2004 14:42 W A ragged front is guessed to appear developing toward NW and somehow seems to push the two structures already under development on NW and SW. It is difficult to discern whether is an independent event or if it is just part of the event reported to start at 09:42 UT. The whole resulting complex event (as seen in C2 FOV) spans almost 180 deg, from NW to SE. ------------------------------------------------------------------------------------- 21-Apr-2004 00:06 S Following previous complex event, several wide loop fronts develop well toward S. **** 2004/04/21 at 05:37 UT: SOHO in ESR (Emergency Sun Reacquisition) **** **** LASCO doors close. No more LASCO observations until LASCO Recovery **** **** on 2004/04/29 at ~12:00 UT. **** -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- **** SOHO was recovered to near normal roll attitude on 2004/04/27. **** **** Station keeping and momentum management between ~ 17:00 - 20:00. **** 27-Apr-2004 07:13 EIT FeXII Time. EIT FeXII images show a brightening Potential on NOAA AR 0599 at 07:13 UT (located by the time Halo CME around N17E05) surrounded afterward by a strong dimming, likely signature of a CME. An intensity disturbance is seen to travel across the disk as the event develops. The event was associated with a C3.1 X-ray flare that GOES records from NOAA AR 0599 between 07:08 - 07:37 UT with peak emission at 07:23 UT. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/244.html -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- **** LASCO Recovery on 2004/04/29 at ~12:00 UT. **** 29-Apr-2004 19:27 SW Ragged loop front followed at 21:26 UT to SE by a couple of wide loops. By that time a front begins to be visible above NW. The resulting complex event has the appearance of a 'full' halo CME in C2 FOV by 23:06 UT, though rather faint above the W Limb. EIT Fe XII images show no signatures of the event on the disc. Likewise, there is no report of a flare by the time. Therefore, the event was most probably backsided. Faint ragged loop fronts follow above the SE limb by the beginning of next day. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/245.html ------------------------------------------------------------------------------------- 30-Apr-2004 04:26 NW Bright ragged front. EIT Fe XII running difference images show CME coming out from just behind the NW limb starting at around 02:36 UT. 30-Apr-2004 07:27 W Front to S of previous event preceded by a faint and diffuse front to S at 06:26 UT that quickly fades. The front fades throughout C2. It could be related to C 1.9 X-ray flare occurred on S14W42 between 05:35 - 05:55 UT with peak emission at 05:47 UT. EIT show signatures of the event (wave and dimming toward W and N) starting at ~05:36 - 05:48 UT. 30-Apr-2004 18:26 NE Very Faint ragged front. It fades throughout C2. ===================================================================================== 01-May-2004 03:50 W Fairly faint ragged front followed by a similar front at 06:50 UT, both developing slightly toward SW. 01-May-2004 10:06 WSW Narrow and fairly faint ragged front slightly to S of previous event followed a 14:26 UT by a much brighter one. 01-May-2004 16:50 W Following event at 10:06 UT, ragged loop front and trailing material. Faint extensions (first seen at 17:06 UT) above SW limb up to S Pole that fade in C2. At ~ 19:50 UT a bright and elongated loop front with twisted trailing material develops to S of the ragged front. 01-May-2004 20:26 NW Vey narrow ragged loop front along starts developing at ~ 4 solar radii. Difficult to give an exact time of first appearance. Some infalling material. Some gusty outflow follows. 01-May-2004 23:06 SE Ragged and diffuse loop front. It fades throughout C3. ------------------------------------------------------------------------------------- 02-May-2004 04:26 WSW Ragged and diffuse loop front accompanied, at the PA of its northern leg, by a brighter and apparently faster feature first clearly discerned at ~ 08:06 UT. Difficult to discriminate from one another during development, if really two different features. EIT Fe XII images show a faint wave and dimming to SW and S of NOAA AR 10601 between 03:24 - 04:24 UT. 02-May-2004 19:27 W Bright and asymmetric loop front. EIT Fe XII images show signatures of a CME again associated with NOAA AR 10601 between 18:24 - 19:25 UT. 02-May-2004 20:50 NE Faint narrow and elongated ragged loop front. ------------------------------------------------------------------------------------- 03-May-2004 00:26 SE Initially bright loop front develops as a 'bubble- like' CME. Some gusty outflow follows. EIT Fe XII images show the development of a barely backsided event above the SE limb starting at ~ 23:12 UT on previous day. 03-May-2004 02:06 SW Wide and asymmetric loop front develops toward SW in the trail of event reported to start at 19:27 UT on previous day. It is difficult to determine the exact time of first appearance. At 03:06 UT, on the S Pole (at the apparent position of the southern leg of the asymmetric loop), an elongated loop front develops slightly toward SE. The resulting complex event has the appearance of a partial halo CME in C3 FOV. 03-May-2004 04:50 NE Ragged front superposed with a loop front in the LOS. The ragged front develops faster than the loop, resulting in a complex feature with structured inner part (C2). At ~08:50 UT another ragged loop front develops above the E limb. CME signature in EIT Fe XII running difference images between 05:48 and 10:24 UT, coming out from behind the ENE limb. 03-May-2004 16:06 NW Feature moving out, and a much smaller one falling down. Separation point at ~ 3 solar radii at PA ~ 314 deg. 03-May-2004 19:50 W Extremely faint loop precedes a fast though very faint asymmetric loop front, which is clearly visible since 23:06 UT, already at ~ 1.5 solar radii above the C2 occulter. By the time, several small ragged fronts to S (blob-like), developing toward SW, even during the next day. 03-May-2004 21:50 SSE Fairly faint ragged loop front. It fades throughout C2. ------------------------------------------------------------------------------------- 04-May-2004 06:26 NE 'V-shaped' feature. Difficult to give exact time of formation. Very faint ragged front to S moving slightly faster. They fade throughout C3. 04-May-2004 11:26 NE Another 'V-shaped' feature (though more elongated) slightly to N of previous event. It fades in C3. 04-May-2004 13:27 SW Faint ragged front. It fades throughout C3. Small ragged fronts (blob-like) follow starting at ~ the end of the day and on next day. 04-May-2004 17:50 E Ragged loop front developing slightly toward SE. It fades throughout C3. 04-May-2004 23:26 SSE Faint and diffuse loop front that fades close to the inner edge of C3. 04-May-2004 23:50 NE Another 'V-shaped' feature. ------------------------------------------------------------------------------------- 05-May-2004 00:50 NW Ragged front that fades in C2. Infalling material on the West Limb. 05-May-2004 04:26 E Fairly faint ragged front developing slightly toward NE. It fades throughout C2. 05-May-2004 10:50 E Faint ragged and diffuse front that fades close to the inner edge of C3 FOV. **** LASCO data gap from 16:00 to 17:30 UT due to ICAL01 **** **** (intercalibration for EIT with CDS). **** 05-May-2004 20:26 ESE Ragged loop front with apparently twisted trailing material. ------------------------------------------------------------------------------------- 06-May-2004 02:50 NW Ragged front that quickly fades. Event signature in EIT Fe XII running difference images starting at 02:12 UT right on the NW limb. Material moving all along a rising loop. 06-May-2004 05:50 E Ragged loop front that fades throughout C2. Backsided CME seen on E Limb in EIT Fe XII starting at 04:48 UT. 06-May-2004 08:26 NW Another ragged front preceding another similar one at 11:26 UT slightly to N. 06-May-2004 10:50 E Ragged loop front developing slightly toward SE. Slow twisted structure develops behind. Backsided CME (fainter than the previous one) seen in EIT Fe XII at ~ 10:14 UT to S of event reported to start at 04:48 UT (EIT Fe XII time). 06-May-2004 23:26 NW Wide though faint and diffuse loop front. It fades throughout C3. ------------------------------------------------------------------------------------- 07-May-2004 10:50 ESE Bright loop front and trailing material. Extremely faint extensions over the NW limb by 11:50 UT. Big signature of a barely backsided CME in EIT Fe XII running difference images above the ESE limb. Intensity disturbance seen traveling toward the S Pole all above the SE limb. Wave on disk by 11:12 UT. 07-May-2004 15:06 W Fairly faint 'legs' over the N and S Pole of either an apparently very wide loop front or of a loop front on the SW limb and another one on the NW limb. The latter seems more likely, as a diffuse loop front is guessed on NW by 15:26 UT. Front of the 'complex' events on W Limb barely visible. Event(s) could be associated with a C1.0 X-ray flare reported by GOES that occurred on NOAA AR 10605 (by the time located at S11W36) between 13:37 - 14:23 UT with peak emission at 14:03 UT. 07-May-2004 17:26 NNW Ragged loop front. 07-May-2004 18:50 NE Slow development of a system of loops along streamer. By 23:50 UT a ragged loop front starts develolping and surpasses the slowly evolving loop system. 07-May-2004 21:26 E Ragged asymmetric loop ('spray-like') front. ------------------------------------------------------------------------------------- 08-May-2004 02:26 S Diffuse asymmetric loop front. 08-May-2004 09:50 E Very faint and narrow fan-like front. It fades in C2. 08-May-2004 10:26 NE Very faint front. By ~ 16:50 UT a fairly faint asymmetric front can be seen, one leg along the streamer, the other one close to the N Pole. 08-May-2004 12:26 W Spray-like front. It fades throughout C3. 08-May-2004 22:26 WSW Narrow ragged front. 08-May-2004 23:26 SE Faint and narrow spray front. It fades in C2. ------------------------------------------------------------------------------------- 09-May-2004 00:26 NW Ragged front that fades close to the inner edge of C3. 09-May-2004 05:26 NE Very small and narrow ragged front along the streamer that davelops as an asymmetric loop front. It is followed by a similar feature at ~ 12:06 UT. Gusty outflow well into next day. 09-May-2004 08:26 SW Ragged loop front followed at 10:06 UT by another one at ~ 10:06 UT. 09-May-2004 14:06 ESE Faint and diffuse front followed at ~ 18:26 UT by a ragged front. Very faint extension over the E Limb that extends up to ~ the streamer on NE. 09-May-2004 20:50 W Spray-like front. ------------------------------------------------------------------------------------- 10-May-2004 00:26 SE Slow development of a very faint feature later showing extensions up to the S Pole and making following reported event appear even wider. 10-May-2004 04:50 W Wide and bright ragged loop front with structured inner part. B1.9 X-ray flare reported by GOES on NOAA AR 10604 (located by the time at S19W29) between 03:48 - 04:04 UT with peak emission at 03:55 UT. EIT Fe XII shows a filament channel activation at ~ S20W25 between 01:48 and 03:48 UT. Despite its wide angular span in C2 and C3 (e.g., from ~ PA 180 - 330 by 14:18 UT in C3) the CME signature is not seen to cross clearly the central meridian. Therefore, it was not catalogued as a partial halo CME. The average plane-of-sky speed of the event measured on C3 data at PA 262 was about 345 km/sec, showing practically no acceleration. 10-May-2004 06:50 ENE Faint spray-like front that fades throughout C2 (to S of streamer). It is followed slightly to S at 07:27 UT by a very narrow ragged loop front. 10-May-2004 10:06 SW Following event at 04:50 UT, ragged front with twisted trailing material. Faint loop-like extensions above the W limb. 10-May-2004 19:50 SW Bright ragged loop front. EIT Fe XII images show a backsided CME on SW limb between ~19:13 - 22:00 UT with some filament motion on the near side. ------------------------------------------------------------------------------------- 11-May-2004 00:06 WSW Another bright ragged loop front. The event develops on the W limb as a twisted (and 'round') structure, and on the SW with a ragged structure. Gusty outflow follows, all along the day. 11-May-2004 00:06 NW Extremely faint asymmetric and diffuse loop front. 11-May-2004 04:06 W Very narrow ragged front ('jet-like') followed at 06:06 UT by a similar one. They fade throughout C2. 11-May-2004 10:26 SE Bright loop front, brighter to S. Bright spray-like structure develops in parallel within the loop. EIT Fe XII show a faint signature of a backsided CME on the SE limb between 10:00 and 10:24 UT. 11-May-2004 11:50 W Faint fan-like front that fades close to the inner edge of C3. It is followed by a couple of similar fronts (though narrower). In particular at: 15:26, 16:50, and 20:50 UT. 11-May-2004 20:50 NE Wide ragged loop front that fades throughout C3. In C2, the inner part shows two loop-like structures, one developing toward E, the other one toward N. At ~23:50 UT an elongated loop front is seen to develop the on E Limb. Difficult to discern whether is part of the same event or is an independent event. ------------------------------------------------------------------------------------- 12-May-2004 00:06 W Bright spray-like front brighter to S. It fades throughout C3. It is followed by a couple of fainter fan/spray-like fronts at: 02:26, 04:06, 05:26 UT. 12-May-2004 06:26 ESE Very narrow ragged front. It fades throughout C2. 12-May-2004 16:26 E Diffuse front preceding a brighter structure at ~17:50 UT. Apparently twisted structure. It fades throughout C3. 12-May-2004 21:26 SW Blob-like front starting at around 3.5 solar radii. Difficult to give an exact time of first appearance. It fades throughout C3. ------------------------------------------------------------------------------------- 13-May-2004 02:06 W Faint elongated and diffuse front that fades throughout C2. 13-May-2004 02:26 ESE Very narrow ragged front that fades throughout C2. 13-May-2004 05:50 E Bright loop front preceded by a faint and diffuse front. It is followed by another loop structure at ~ 07:50 UT with apparently twisted trailing material. Faint signature of material being swept away to N. 13-May-2004 11:26 E Bright ragged front and twisted trailing material. Faint asymmetric loop-like extensions to N. 13-May-2004 15:26 E Another bright ragged front and twisted trailing material. It pushes toward N a loop-like feature of previous event. EIT Fe XII images show the development of a bright backsided feature on E Limb between 15:00 and 16:12 UT. 13-May-2004 20:26 E Bright ragged loop front and twisted inner structure. EIT Fe XII running difference images show backsided ejecta coming out from behind ENE Limb developing toward S between 20:00 - 20:36 UT. ------------------------------------------------------------------------------------- 14-May-2004 00:06 E Faint loop front that is brighter above the ESE Limb, most likely because it superposes in the LOS with a preceding (fainter) elongated loop-like structure. It is difficult to give an exact time of first appearance (feature lost at the beginning in the trailing material of previous event). Not discernible in C3. 14-May-2004 03:06 E Small ragged front. It fades throughout C2. 14-May-2004 03:50 NE Diffuse front develops as a faint asymmetric loop- like feature, followed at 08:26 by a brighter narrow front at roughly the PA of the northern leg (along streamer). Another ragged front by ~14:06 UT. Outflow continues along the day to S of streamer. 14-May-2004 08:26 E Bright elongated feature. EIT Fe XII running difference images show a bright barely backsided CME starting at 07:48 UT. 14-May-2004 19:27 SW Blob-like feature starting at around 4.2 solar radii. Difficult to give exact time of formation. 14-May-2004 23:37 SE Very faint loop front. It fades very close to the inner edge of C3 FOV. ------------------------------------------------------------------------------------- 15-May-2004 02:26 ESE Ragged fan-like front that precedes a ragged front at 05:26 UT above the E limb, and a diffuse and ragged loop front at ~06:50 UT on the ESE Limb that fades troughout C2. 15-May-2004 04:06 WSW Bright loop front with twisted inner core. By ~ 06:50 UT a small and fainter ragged front appears ahead of the southern part of the LE of the bright loop front developing apparently faster. 15-May-2004 08:26 NE Kind of gusty outflow developing towards NNE, superposed in the LOS with an initially slowly- evolving system of loops. 15-May-2004 13:27 E Faint and wide loop front brighter above the SE Limb. Very faint in C3, and only close to the inner edge. By ~ 16:06 UT a ragged narrow front appears above the E Limb. It is 'pushed' toward N as it develops. 15-May-2004 16:26 W Bright ragged loop front, cavity, and bright twisted inner core. It appears at roughly the PA of the northern leg of the event reported to start at 04:06 UT. 15-May-2004 20:50 E Another faint and wide loop front brighter above the SE Limb. By ~ 22:26 UT a small ragged front develops above the E Limb and quickly fades. ------------------------------------------------------------------------------------- 16-May-2004 01:27 E Bright and elongated loop front. It fades throughout C3. 16-May-2004 02:26 ESE Fast fan-like front preceding a very faint loop front at ~ 05:26 UT that quickly fades. 16-May-2004 02:26 NW Small ragged front. Barely visible in C3. 16-May-2004 06:50 W Extremely faint ragged loop front in the trailing twisted structure of event reported to start at 16:26 UT on previous day. 16-May-2004 12:50 WSW Small blob-like front. Difficult to establish the exact time of first appearance. Gusty outflow. ------------------------------------------------------------------------------------- 17-May-2004 05:26 W Bright ragged loop front and trailing material. It fades throughout C3. In C2, a very faint and diffuse envelope surrounds the front. CME signature in EIT Fe XII starting between 04:12 - 04:24 UT right on W Limb. 17-May-2004 05:50 NE Kind of 'reconexion' event. Structure flowing out an another one falling down. Separation point at ~ 3.8 solar radii (PA ~ 55 deg). 17-May-2004 06:50 SE Fast narrow and ragged (diffuse) loop front. It fades throughout C3. 17-May-2004 11:50 W Faint ragged loop front in the trailing material of event reported to start at 05:26 UT. By that time, the slow development of a twisted structure can be seen in C2 superposed in the LOS. Difficult to separate the events. 17-May-2004 13:27 ESE Bright front with asymmetric faint extensions to N and S. The extensions are barely visible in C3. Backsided CME signatures in EIT Fe XII running difference images startint at ~ 11:48 UT on ESE Limb. Gusty outflow follows. 17-May-2004 15:26 SW Wide asymmetric loop front. Difficult to give an exact time of first appearance. By 22:06 UT, a more symmetric loop develops within the previous asymmetric loop, while at roughly the PA of its northern leg an apparently faster front seems to develop (not clear in C3). No signatures of the event seen on the disk in EIT Fe XII images. 17-May-2004 18:26 E Bright and relatively narrow front with faint extensions to N and S. It fades throughout C3. It is followed by a couple of narrower ragged fronts at 21:26 UT, and 00:06 UT (on next day). ------------------------------------------------------------------------------------- 18-May-2004 00:06 W Slow development of a twisted structure. Gusty outflow (moving faster than the twisted structure) superposed in the LOS. Some small ragged fronts can be discerned to S (at PA ~ 241 deg) all along the day. 18-May-2004 08:50 E Bright and big spray-like front. Some trailing material. It fades throughout C3. By ~ 10:26 UT some infalling material to S (at PA ~ 115) with corresponding feature moving outward. 18-May-2004 14:50 SE Following 'reconexion' event mentioned in previous event, a very faint asymmetric loop front starts developing at ~ 3.6 solar radii. Barely visible in C3. 18-May-2004 21:26 NE Faint asymmetric front expanding toward N. It is preceded by rather similar signatures since early in the afternoon (though not very clear). ------------------------------------------------------------------------------------- 19-May-2004 03:26 W Faint `V-shaped` feature starting at ~ 3.30 solar radii. 19-May-2004 03:26 WSW Ragged loop front followed at ~ 06:26 UT by a twisted structure. They fade throughout C3. Gusty outflow follows. Another twisted structure by ~ 21:26 UT (though the time of first appearance is difficulte to give exactly). 19-May-2004 08:26 W Ragged front just N of previous event developing slightly toward WSW. 19-May-2004 09:26 SE Fairly faint asymmetric loop front. It is first seen at ~ 3.7 solar radii. It fades throughout C3. 19-May-2004 11:50 N Very faint loop front developing slightly toward NNE. It is first seen at ~ 3.8 solar radii. It fades throughout C3. 19-May-2004 20:06 NNW Big ragged loop front with structured interior. The front spans ~ 105 deg, from PA 280 - 25 by 23:26 UT (C2). An elongated loop front develops by 04:26 UT on next day, roughly at the central PA of the ragged loop front. ------------------------------------------------------------------------------------- 20-May-2004 00:26 W Ragged front that fades close to the inner edge of C3. CME signature in EIT Fe XII images right on W limb starting at ~ 23:12 UT on previous day. 20-May-2004 02:26 NE Big and bright ragged loop front and trailing material. The mean plane-of-sky speed was around 437 km/s at PA 40 deg (based in C3 data), showing slight acceleration. The front spans ~ 70 deg from PA 7 - 77 by 04:50 UT (C2). EIT Fe XII images show a filament eruption starting at ~ 01:25 UT, nearby (north of) NOAA AR 0615, and developing toward NE. 20-May-2004 05:26 E Kind of 'reconexion' event. Separation point at ~ 3.5 solar radii (material moving in both directions, i.e., outward and falling down). 20-May-2004 09:50 NNW Ragged loop front moving slightly toward N of event reported to start at 04:26 UT (see event on 19-May at 20:06 UT). Gusty outflow. 20-May-2004 11:06 W Diffuse loop front that fades close to the inner edge of C3. 20-May-2004 17:06 W Ragged loop front and apparently twisted trailing material. It fades troughout C3. 20-May-2004 23:26 NW Ragged expanding feature. Difficult to give an exact time of first appearance. No clear leading edge. Some structured outflow (faint) into next day. ------------------------------------------------------------------------------------- 21-May-2004 05:50 WNW Asymmetric loop front in the trailing material (southern leg) of event reported to start at 23:26 UT on previous day. It fades close to the inner edge of C3. 21-May-2004 12:26 NE Narrow and faint ragged front. It fades throughout C2. 21-May-2004 18:26 N Extemely faint loop front, developing slightly toward NNE. It fades throughout C3. 21-May-2004 19:27 ESE Faint ragged front. It fades throughout C3. ------------------------------------------------------------------------------------- 22-May-2004 00:26 ESE Ragged and diffuse front followed at ~ 02:26 UT by a narrow spray-like front. Both fronts fade in C2. 22-May-2004 01:27 NE Another narrow and faint ragged front that fades throughout C3. 22-May-2004 04:26 NW Ragged fan-like front. It fades close to the inner edge of C3. 22-May-2004 06:50 SW Very faint (though wide) loop front, barely visible in C3. At 07:27 UT a bright and narrow fan-like front develops. It fades close to the inner edge of C3. ------------------------------------------------------------------------------------- 23-May-2004 06:50 ESE Very faint jet-like front that quickly fades. 23-May-2004 11:06 W Bright and wide ragged loop front. EIT Fe XII running difference images show a signatures of a limb CME above the W Limb (barely backsided) starting at 11:00 UT. Material is swept away toward N and S as the event develops. Difficult to discern whether that signature belongs to the limb event or to the halo event reported to start at 11:50 UT. 23-May-2004 11:50 HALO Faint extensions to N of previous event surround completely the C2 occultor by 12:50 UT. The event is first seen in C3 at 11:42 UT, the C3 occultor being completely covered by 15:18 UT. GOES recorded a B4.3 X-ray flare between 11:30 and 11:43 UT on NOAA AR 10618 (by the time at S12E32), which most likely has no association with the halo event. No visible signatures on the disk as seen in EIT Fe XII other than that of the flare. The event has therefore been determined as a faint 'full' (asymmetric) halo CME, most probably backsided. 23-May-2004 15:26 ESE Very faint asymmetric loop front. 23-May-2004 15:50 W Diffuse and ragged loop front with apparently twisted trailing materia developing toward WNW. By 16:26 UT a diffuse loop front starts developing to S. They both fade throughout C3. ------------------------------------------------------------------------------------- 24-May-2004 05:06 W Very narrow ragged front. It is followed by several similar faint fronts, in particular at: 09:26, 14:26, and 17:50 UT. They all fade throughout C2. 24-May-2004 07:27 SE Ragged and diffuse loop front. It fades throughout C3. Extremely faint extensions over the S Pole (in fact barely visible); not possible to discern whether they are part of the same event or not. 24-May-2004 21:26 N Bright front (1) and structured interior, followed at 23:17 UT by an elongated loop-like front at roughly the PA of the leg on the NE Limb. At ~ 01:27 UT on the the next day, another elongated loop-like front and apparently twisted trailing material at roughly the PA of the leg on the NW Limb (gusty outflow follows). The 'complex' event ('complex' as seen in the FOV of the coronagraphs) spans ~ 115 deg in the C3 FOV by 06:18 UT (on next day), from PA 300 - 055. The mean plane-of-sky speed of the LE of (1) was ~ 344 km/s at PA 11 deg (based on C3 data). EIT Fe XII shows a filament eruption across the central meridian in the northern hemisphere starting at around 18:00 UT. ------------------------------------------------------------------------------------- 25-May-2004 02:26 W Fan-like front. It fades in C3. 25-May-2004 05:50 N Elongated loop fronts. 25-May-2004 15:06 E Faint spray-like front that fades throughout C2. 25-May-2004 19:50 NW Slow development of system of loops along streamer. It becomes 'streamer blowout' late on next day (difficult to determine exactly when). In particular, by ~ 15:26 UT (on May 26) the development of an asymmetric loop front with faint extensions being pushed toward the N Pole can be seen. It is clearly seen in C3 FOV by 19:42 UT (on May 26). Some trailing material. 25-May-2004 21:50 WNW Extremely faint loop front. It fades throughout C2. ------------------------------------------------------------------------------------- **** LASCO data gap from 11:00 to 12:30 UT due to ICAL01 **** **** (intercalibration for EIT with CDS and SUMER). **** 26-May 2004 12:50 SW Kind of ragged 'half-loop' (southern leg barely visible) front preceded by a fainter and diffuse front at 10:50 UT. Several other faint 'half-loop' fronts follow. They fade throughout C3. ------------------------------------------------------------------------------------- 27-May-2004 01:50 NW In the trailing material of event reported to start at 15:26 UT on previous day (see entry at 19:50 UT on May 25), structured feature and trailing material. Kind of 'reconexion' event by ~ 08:50 UT: Infalling material starting at ~ 3.7 solar radii (PA ~ 303). Gusty outflow with several other 'reconexion' events all along the day. 27-May-2004 18:50 WSW Very slow development of a structured (twisted?) feature. It is difficult to give an exact time of first appearance due to the so slow evolution and faintness. 27-May-2004 21:26 SW Ragged and diffuse elongated loop front with an elongated 'spray-like' inner part. Difficult to give an exact time of first appearance. ------------------------------------------------------------------------------------- 28-May-2004 03:26 E Ragged loop front with apparently twisted trailing material developing toward ESE. It fades throughout C3. 28-May-2004 04:50 W Bright ragged 'balloon-like' front with apparently very faint extensions to N and S, the latter superposed in the LOS with event reported to start at 18:50 UT on previous day. 28-May-2004 11:06 SE Diffuse loop front with apparently twisted inner part. 28-May-2004 15:26 NW Small ragged front that fades close to the inner edge of C2. Gusty outflow. 28-May-2004 18:26 W Elongated loop front, apparently superposed in the LOS (C2) with the trailing part of the slow event reported to start at 18:50 UT on previous day. It is followed at ~ 20:50 UT by another loop front. 28-May-2004 18:26 NE Ragged asymmetric front. Barely visible in C3. ------------------------------------------------------------------------------------- 29-May-2004 01:27 SW Faint ragged loop front immediately followed by a slightly brighter loop front. They fade throughout C3. 29-May-2004 01:50 W Ragged loop front. By 02:50 UT, a brighter narrow front followed by gusty outflow right on W, at roughly the southern leg of the loop front. Some 'reconexion' events later, with infalling material in the gusty outflow. 29-May-2004 03:34 NNW Extremely faint, elongated and diffuse loop front. Barely visible. 29-May-2004 09:06 NE Narrow asymmetric loop front, brighter to S. It fades close to the inner edge of C3. 29-May-2004 15:50 WSW Narrow spray-like front. It fades throughout C2. 29-May-2004 21:26 SW Extremely faint loop front. Difficult to give an exact time of first appearance due to its faintness. It fades throughout C3. ------------------------------------------------------------------------------------- 30-May-2004 05:26 NW Small ragged front along streamer. It can be discerned starting at ~ 4 solar radii. 30-May-2004 15:26 NW Narrow ragged loop front that fades throughout C3. Gusty outflow. By 20:50 UT, infalling material to S (PA ~ 290) starting at ~ 3.75 solar radii. 30-May-2004 17:26 S Very narrow spray front that fades throughout C2. 30-May-2004 21:50 E Faint and diffuse elongated loop front moving slightly toward ENE. It fades close to the inner edge of C3. ------------------------------------------------------------------------------------- 31-May-2004 00:50 WSW Faint and diffuse loop front that quickly fades (in C2), followed at 05:26 by a similar event. 31-May-2004 04:26 NW Very narrow spray-like front that fades close to the inner edge of C3. By 10:50 UT, expanding feature without a very clear front. 31-May-2004 10:50 WSW Faint and diffuse loop front, though wider than events reported to start at 00:50 UT. 31-May-2004 20:26 E Diffuse loop front that quickly fades (in C2). 31-May-2004 20:50 WSW Ragged and diffuse front that fades close to the inner edge of C3. ===================================================================================== 01-Jun-2004 03:26 W Several jet-like fronts at 03:26, 04:50, and 06:06 UT developing slightly toward WSW. They fade throughout C2. 01-Jun-2004 10:06 W Bright loop front and cavity with faint extensions to N. 01-Jun-2004 17:06 NW Elongated ragged loop front in the trailing material of the event reported to start at 10:06 UT at the PA of the leg on the NW Limb. 01-Jun-2004 18:50 WSW Bright ragged asymmetric loop front moving toward W in the trailing material of the event reported to start at 10:06 UT at roughly the PA of the leg on WSW Limb (very faint extensions to N). Apparently twisted trailing material. It is preceded at 17:26 UT by a jet-like front, and followed at 22:06 UT by another elongated ragged front. 01-Jun-2004 22:26 N Fairly faint elongated loop front (difficult to give an exact time of first appearance). It is followed by several faint ragged fronts during the first half of next day. They all fade throughout C3. ------------------------------------------------------------------------------------- 02-Jun-2004 05:50 WSW Faint ragged front that fades close to the inner edge of the C3 FOV. 02-Jun-2004 10:50 WSW Faint ragged front accompanied by a jet-like front, and followed by a couple of ragged spray-like fronts (at 11:50 UT and 13:27 UT) that fade close to the inner edge of C3. 02-Jun-2004 18:58 NW Bright asymmetric ragged loop front, much brighter to N. **** Only 1 LASCO C2 image per ~hour, no LASCO C3 images **** **** between 20:00 - 22:40 UT due to EIT Shutterless **** **** Campaign (Subfield images in 304 A). EIT CME watch **** **** resumed at 00:00 UT on 03-Jun-2004. **** 02-Jun-2004 20:50 W Spray-like front immediately followed (21:41 UT) by a diffuse loop front. 02-Jun-2004 23:15 W Bright ragged loop front (typical limb event). However, extremely faint extensions seem to surround the C2 occultor by 00:26 UT on next day (not discernible in C3). Gusty outflow at the PA of the southern leg of the event. ------------------------------------------------------------------------------------- 03-Jun-2004 05:50 WSW Narrow and ragged asymmetric front in the gusty outflow at the southern leg of event reported to start at 23:15 UT on previous day. It fades throughout C3. It is preceded at 03:06 by a bright jet-like front that fades throughout C2. 03-Jun-2004 09:50 WNW Diffuse and ragged loop front that fades throughout C3. 03-Jun-2004 12:06 E Diffuse and ragged loop front. By 12:50 UT, above the ESE Limb, a jet like front is first seen and evolves apparently accompanying the development of the ragged front in C2. 03-Jun-2004 13:27 W Bright ragged front with fairly faint loop-like extensions to N, developing slightly toward WNW. It fades throughout C3. It is followed at 14:26 UT by a fan-like front, barely visible in C3. 03-Jun-2004 15:26 SW Slow development of a faint system of arcades apparently afected during its development in C2 by the event reported to start at 16:50 UT. At 18:26 UT a relatively brighter (and asymmetric) front appears and seems to push earlier features. No visible signature associated with the event on the disk as recorded by EIT in Fe XII. 03-Jun-2004 16:50 W Wide and bright loop front, cavity and trailing material. Typical limb event. Faint extensions to N. Difficult to discern whether they are part of the limb event or belong to the event reported to start at 15:26 UT (or not associated at all with previous events mentioned). EIT Fe XII running difference images show a barely backsided event above the W Limb starting at around 16:12 UT. By 16:36 UT a bright feature is seen to develop toward NW. **** Special LASCO C3 Venus Observations between 17:00 - 19:00 UT *** **** No EIT images. *** 03-Jun-2004 21:50 NE Ragged and diffuse loop front. ------------------------------------------------------------------------------------- 04-Jun-2004 02:26 W Fan-like front developing toward WNW. It is surpassed in the C3 FOV by the event reported to start at 07:50 UT. 04-Jun-2004 06:50 WSW Narrow ragged loop front, surpassed later by event reported to start at 07:50 UT. 04-Jun-2004 07:50 W Complex event: Very bright loop front (1) above the W limb, with the typical appearance of a limb event. At 08:06 UT an apparently 2nd front (2) can be discerned in the NW quadrant of C2 with its LE ahead of the loop front. By 09:26 UT faint extensions surround almost the C2 occultor, spanning ~ 260 deg from PA 165 - 65. It is difficult to establish their association to the features aforementioned. EIT Fe XII running difference images show signatures of a CME above the W Limb starting at 07:36 UT, apparently originated on the far side of the Sun, though relatively near the limb. Starting at 07:48 UT an intensity disturbance is seen to travel toward N and S (always above the limb) as the event develops. Given the fact that no visible signatures are seen on the disk, nothing can be said about their likely association. Likewise, GOES recorded no significant X-ray activity during the day. Therefore, from a global point of view, this event could be catalogued as a 'partial' (almost 'full') halo CME, backsided. Gusty outflow follows on the WNW Limb along the day with some ragged fronts. **** Special LASCO C3 Venus Observations between 15:00 - 17:00 UT *** **** No EIT images. *** ------------------------------------------------------------------------------------- 05-Jun-2004 02:06 WSW Ragged 'flat' loop front. It fades throughout C3. 05-Jun-2004 06:26 WSW Bright spray-like front. It surpasses previous event in the C3 FOV by ~07:32 UT, fading afterward. Couple of faint ragged loop fronts above the W Limb by 07:27 UT. 05-Jun-2004 09:06 N Bright and wide loop front. It fades throughout C3. 05-Jun-2004 09:06 NE Elongated spray-like front just to S of the leg on the NE quadrant of previous event. It is followed by a similar front at 11:50 UT. By 14:50 UT a ragged loop front follows. They all fade throughout C3. 05-Jun-2004 16:06 NNW Slow development of a faint ragged loop front. 05-Jun-2004 18:26 NNE Couple of wide loop fronts that quickly surpass in the C2 FOV the event reported to start at 16:06 UT. **** Special LASCO C3 Venus Observations between 21:00 - 23:00 UT *** **** No EIT images. *** ------------------------------------------------------------------------------------- 06-Jun-2004 00:06 ENE Bright and narrow spray-like front just to S of the leg in the NE quadrant of event reported to start at 18:26 UT on previous day. It fades throughout C3. Fairly faint elongated ragged front by 05:26 UT. 06-Jun-2004 06:26 W Fairly faint narrow loop front. It fades throughout C3. **** Special LASCO C3 Venus Observations between 15:00 - 17:00 UT *** **** No EIT images. *** 06-Jun-2004 17:26 W Fairly faint couple of loop fronts developing toward W and N. Not well defined front. They fade close to the inner edge of C3. ------------------------------------------------------------------------------------- 07-Jun-2004 01:26 SW Faint asymmetric 'full' halo CME. Several events occurred. The likely signature corresponding to the faint 'halo' event was first observed (though still barely discerned) in C2 at 00:50 UT as a very diffuse front above the WSW limb. By 01:27 UT, it can be clearly identified as a very diffuse loop front (1). By this time, a bright loop front (2) starts developing above the SW limb. Feature (2) develops in C2 exhibiting an apparently twisted inner structure. By 03:50 UT, extremely faint extensions seem to surround completely the C2 occultor. The diffuse front (1) is first seen in C3 above the WSW limb at 01:42 UT, while the loop front (2) is first seen in the next frame, i.e., at 02:18 UT. The front (2) seems to be confined almost completely within PA 155-295. Meanwhile, faint extensions, likely belonging to feature (1), completely surround the C3 occultor by 07:42 UT. Gusty outflow in SW along the day. GOES reported the following X_ray events, which could likely be associated with the C2/C3 events mentioned above: (a) a B3.4 X-ray event at S07W00 (associated to NOAA AR 10624) between 22:26 - 23:14 UT with peak emission at 22:53 UT (on 2004/06/06). (b) a C2.7 X-ray event at S17W42 (associated to NOAA AR 10621) between 00:01 - 01:15 UT with peak emission at 00:44 UT (on 2004/06/07). This event is indeed clearly associated with the C2/C3 event (2). For more details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/248.html In summary, if (a) is really associated to the faint diffuse halo front (2) seen in C2 and C3 images, the event is to be catalogued as a 'full' halo CME, frontsided. Should that not be the case, there still seems to be enough evidence to say that there was at least a partly Earth directed event. 07-Jun-2004 08:50 NE Ragged elongated loop front. It fades throughout C3. 07-Jun-2004 11:50 WSW Faint elongated front. It fades throughout C3. 07-Jun-2004 19:38 ENE Bright narrow ragged spray-like front. It fades troughout C3. 07-Jun-2004 21:59 NW Diffuse front appears above NW Limb. By 23:34 UT a bright ragged front is discerned with apparently twisted inner structure. In C3 FOV, after 03:18 UT on next day, two different features are apparent: i) the ragged loop front developing WNW, and ii) a narrower feature with a diffuse front a little bit ahead developing toward NW. ------------------------------------------------------------------------------------- 08-Jun-2004 05:26 NE Diffuse faint and ragged loop front. Faint extensions above N Pole and on SE quadrant (C2). Related to the event?? 08-Jun-2004 06:06 E Bright loop front. **** LASCO C2/C3 Data Gap between 06:36 - 19:36 UT because **** **** of EIT Venus Observation Program. **** 08-Jun-2004 21:41 NE Diffuse loop front that quickly fades. 08-Jun-2004 21:41 E Blob-like front. ------------------------------------------------------------------------------------- 09-Jun-2004 03:34 NE Fairly faint ragged front that fades throughout C2. 09-Jun-2004 17:06 SSE Very faint 'half-loop' fronts. Barely visible in C3. 09-Jun-2004 19:27 SW Kind of blob-like front. In C3 it's discerned as a rather narrow loop with a ragged small front resembling a blob. It fades throughout C3. ------------------------------------------------------------------------------------- 10-Jun-2004 03:50 SW Ragged and diffuse loop front. It fades in C3. 10-Jun-2004 10:50 NE Very diffuse front. By 11:06 UT an apparently different front develops toward N above the N Pole. By 12:50 UT couple of 'half-loop' fronts are discerned above the N Pole. 10-Jun-2004 16:26 E Ragged elongated loop front. 10-Jun-2004 22:18 NE Ragged loop front. Gusty outflow follows. ------------------------------------------------------------------------------------- 11-Jun-2004 03:06 NW Kind of reconexion event starting close to the inner edge of C2. Very faint front follows. They fade throughout C3. 11-Jun-2004 04:50 E Extremely faint and diffuse loop front. It fades throughout C2. 11-Jun-2004 12:26 ESE Diffuse loop front that quickly fades (in C2). 11-Jun-2004 16:26 WSW Extremely faint elongated (sharp) loop front. Not discernible in C3. 11-Jun-2004 19:27 W Kind of blob-like feature. Couple of other 'blobs' early on next day. They all fade close to the inner edge of C3. ------------------------------------------------------------------------------------- 12-Jun-2004 05:26 W Ragged and diffuse loop front. It fades throughout C3. 12-Jun-2004 14:06 ENE Faint front superposed in the LOS with the slow development of an apparent system of loops above NE since earlier. ------------------------------------------------------------------------------------- 13-Jun-2004 07:50 NE A twisted feature is discerned within the LOS in the development of the system of loops reported to start on previous day. By 16:50 UT, another feature that develops as a kind of 'V-shaped' front is first guessed apparently superposed in the LOS with the other features mentioned. 13-Jun-2004 14:06 E Diffuse front followed at 14:50 UT slightly to N by another diffuse and slightly brighter diffuse and ragged front. They fade close to the inner edge of C3. 13-Jun-2004 23:26 WSW Bright ragged loop front. Twisted trailing material. ------------------------------------------------------------------------------------- 14-Jun-2004 06:26 N Extremely faint loop front. It is difficult to give an exact time of first appearance due to its faintness. It fades throughout C3. 14-Jun-2004 10:50 E Material falling down ('V-shaped' feature), starting at around 4.10 solar radii (PA ~90 deg), in the gusty outflow present above the East Limb. 14-Jun-2004 18:26 WSW Faint and elongated diffuse loop front. It fades close to the inner edge of C3 FOV. 14-Jun-2004 20:59 NNW Extremely faint and diffuse loop front. Barely discerned in C3 (and only close to the inner edge). 14-Jun-2004 23:50 ENE Faint spray-like front. Infalling material to S early on next day. ------------------------------------------------------------------------------------- 15-Jun-2004 02:26 NE Diffuse front ahead of bright loop front with twisted inner part. EIT Fe XII running difference images show signatures of the development of a limb event starting early in the day. 15-Jun-2004 07:50 SW Bright loop front with twisted inner part. EIT Fe XII running difference images show a CME signature starting, apparently just behind the SW Limb, at 05:48 UT. 15-Jun-2004 08:26 NE Ragged front developing superimposed in the LOS with event reported to start at 02:26 UT. Difficult to give an exact time of first appearance. It is also difficult to discern if it is part of the event at 02:26 UT or an event coming from a different source. **** No EIT data 2004/06/15 (15:00 UT) - 2004/07/04. **** **** (EIT in CCD bakeout mode). **** 15-Jun-2004 20:16 NW Wide loop front with structured interior, preceded at ~ 16:57 UT by an elongated and apparently twisted feature. The latter fades in C3, but before fading seems to be surpassed by the loop. By 00:00 UT on next day an apparently different undefined front, fairly faint, develops superposed in the LOS. 15-Jun-2004 21:12 NNE Diffuse ragged loop front followed at 22:12 UT by an initially brighter ragged front. It becomes then difficult to distinguish one from another in the C3 FOV. ------------------------------------------------------------------------------------- 16-Jun-2004 04:36 E Bright loop front with trailing material. Gusty outflow afterward on NE. Couple of faint ragged fronts along the day. 16-Jun-2004 11:48 SW Very faint loop front. It fades throughout C3. 16-Jun-2004 13:24 NE Extremely faint ragged loop front that quickly fades. 16-Jun-2004 13:36 WNW Elongated structure preceding the very slow development of a faint and apparently circular and twisted structure. 16-Jun-2004 19:36 ENE Faint and small 'half-loop' front. It fades throughout C2. ------------------------------------------------------------------------------------- 17-Jun-2004 02:00 NE Small loop front followed at 03:12 UT (and quickly surpassed) by a spray-like front. They both fade throughout C3. 17-Jun-2004 03:12 E Small blob-like front. It fades throughout C3. 17-Jun-2004 19:12 E Very faint ragged loop front that quickly fades in C2. 17-Jun-2004 22:12 NE Another very faint ragged loop front that quickly fades in C2. ------------------------------------------------------------------------------------- 18-Jun-2004 20:48 NE Spray-like front. ------------------------------------------------------------------------------------- **** Only partial LASCO data between 2004/06/19 - 2004/07/03 **** **** due to intermittent contact during telemetry keyhole. **** **** Most likely some events missed. **** 19-Jun-2004 04:36 ENE Very faint expanding loop system. 19-Jun-2004 08:24 NE Extremely faint and very diffuse wide loop front (barely visible). By 10:36 UT, on ENE, loop system develops and is apparently pushed toward S. 19-Jun-2004 17:48 NE Spray-like front. ------------------------------------------------------------------------------------- 20-Jun-2004 01:24 NNE Jet-like front that fades throughout C2. 20-Jun-2004 05:36 SW Small emission begins before Data Gap. **** LASCO Data Gap on 20-Jun-2004: 11:48 - 21:36 UT **** **** LASCO Data Gap on 20-Jun-2004: 22:12 - 24:00 UT **** ------------------------------------------------------------------------------------- 21-Jun-2004 00:48 NW Narrow loop front already under development. 21-Jun-2004 01:48 NNW Diffuse loop front. **** LASCO Data Gap on 21-Jun-2004: 02:12 - 04:24 UT **** **** LASCO Data Gap on 21-Jun-2004: 05:12 - 10:00 UT **** 21-Jun-2004 10:00 SW Large defined loop, faint, developed during Data Gap. Slow. 21-Jun-2004 11:12 NW Ragged loop front and fairly faint wide area front over N Pole. They both dissipate. **** NO LASCO Data between 2004/06/21 (13:30 UT) and **** **** 2004/06/24 (14:00 UT) due to SOHO S/C maneuvers, **** **** and 180 deg Roll on 2004/06/22. **** ------------------------------------------------------------------------------------ **** LASCO resumes operation on 2004/06/24 at ~ 14:00 UT **** **** after S/C maneuvers on 2004/06/22. **** 24-Jun-2004 Mostly quiet Sun. No visible activity in C2 FOV. **** LASCO Data Gap on 24-Jun-2004: 21:24 - 23:24 UT **** ------------------------------------------------------------------------------------ 25-Jun-2004 Mostly quiet Sun. No visible activity in C2 FOV. **** LASCO Data Gap on 25-Jun-2004: 00:36 - 04:12 UT **** **** LASCO Data Gap on 25-Jun-2004: 10:36 - 13:24 UT **** **** LASCO Data Gap on 25-Jun-2004: 17:48 - 21:12 UT **** ------------------------------------------------------------------------------------ 26-Jun-2004 05:48 WSW Diffuse and elongated spray front that fades throughout C3. By that time, the very slow development of a system of loops can be discerned superposed in the LOS (C2) with the (faster) spray. 26-Jun-2004 05:48 E Loop front with structured (apparently twisted) inner part developing slightly toward ENE. 26-Jun-2004 08:24 E Ragged front partly superimposed in the LOS with previous event, developing slightly toward ESE. Gusty outflow. 26-Jun-2004 13:48 W Small loop front. By that time, an slightly fainter and more diffuse front develops towards WSW. By 14:00 UT another similar front develops toward WNW. The slow development of the system of loops mentioned in event reported at 05:48 UT continues. 26-Jun-2004 15:00 ESE Ragged and elongated loop front that fades throughout C3. **** LASCO Data Gap on 26-Jun-2004: 21:12 - 23:12 UT **** 26-Jun-2004 23:12 W Ragged loop front already under development after data gap, and apparently twisted trailing material developing slightly toward WNW. ------------------------------------------------------------------------------------ 27-Jun-2004 00:00 W Ragged loop front in the trailing material of previous event, developing slightly toward WNW. 27-Jun-2004 02:24 W Small ragged front slightly to S of previous event, moving apparently faster. It fades throughout C3. Gusty outflow toward WSW. **** LASCO Data Gap on 27-Jun-2004: 03:12 - 04:48 UT **** 27-Jun-2004 07:24 WNW Small loop front that fades throughout C2. 27-Jun-2004 09:12 NW Bright loop front with twisted inner core. 27-Jun-2004 09:12 WSW Ragged and undefined loop front. It fades in C3. 27-Jun-2004 09:24 SE Faint and diffuse loop front. It fades throughout C3. **** LASCO Data Gap on 27-Jun-2004: 11:36 - 13:24 UT **** 27-Jun-2004 13:36 W Small but elongated loop front developing slightly toward WSW followed at 15:36 UT by a narrow and ragged loop front. **** LASCO Data Gap on 27-Jun-2004: 18:36 - 20:00 UT **** 27-Jun-2004 20:48 WNW Extremely narrow loop front (jet-like). ------------------------------------------------------------------------------------ 28-Jun-2004 01:24 W Bright loop front. Faint extensions to N and S (shock?). Apparently twisted trailing structure after data gap. **** LASCO Data Gap on 28-Jun-2004: 02:12 - 04:48 UT **** **** LASCO Data Gap on 28-Jun-2004: 08:24 - 13:36 UT **** 28-Jun-2004 15:31 NW Spray-like front that fades throughout C2. 28-Jun-2004 16:24 WSW Small ragged loop front. **** LASCO Data Gap on 28-Jun-2004: 17:12 - 23:36 UT **** ------------------------------------------------------------------------------------ **** LASCO Data Gap on 29-Jun-2004: 02:48 - 09:36 UT **** 29-Jun-2004 09:36 NE Expansion toward NE of an extremely faint feature already under development after data gap. 29-Jun-2004 16:00 ESE Elongated spray-like front. 29-Jun-2004 17:48 NW Wide and asymmetric loop fronts. **** LASCO Data Gap on 29-Jun-2004: 22:12 - 24:00 UT **** ------------------------------------------------------------------------------------ **** LASCO Data Gap on 30-Jun-2004: 00:00 - 02:00 UT **** **** LASCO Data Gap on 30-Jun-2004: 02:24 - 05:24 UT **** 30-Jun-2004 06:00 W Small ragged loop front. **** LASCO Data Gap on 30-Jun-2004: 07:36 - 11:12 UT **** 30-Jun-2004 11:48 W Bright ragged loop front that fades close to the inner edge of C3 FOV. It is preceded by a small ragged front. 30-Jun-2004 17:24 NE Diffuse and faint loop front followed at 20:36 UT (already under development after data gap) by a similar front slightly to N. The second front moves apparently faster than the first one in the C3 FOV and seems to surpass the first front before fading. Trailing material into next day. **** LASCO Data Gap on 30-Jun-2004: 18:48 - 20:36 UT **** 30-Jun-2004 20:57 NW Fairly faint ragged loop front already under development after data gap. It fades throughout C2. 30-Jun-2004 22:36 WSW Ragged loop front that fades close to the inner edge of C3 FOV. ==================================================================================== 01-Jul-2004 01:24 E Loop front with apparently twisted inner structure preceded (surrounded) by a fainter and diffuse front slightly ahead and to N moving faster (first seen at 01:00 UT). Both features fade in C3. 01-Jul-2004 05:48 W Bright loop front with structured interior that fades throughout C3. Extremely faint extensions to N. 01-Jul-2004 11:36 ESE Big spray-like front. At 12:48 UT, a brighter and ragged front is discernible just above the limb in the trailing material. A similar one at 14:24 UT, slightly to N. **** LASCO Data Gap on 01-Jul-2004: 14:48 - 16:24 UT **** 01-Jul-2004 19:12 SW Fairly faint front develops as a V-shaped feature (kind of 'reconexion event': starting at 20:57 UT its counterpart is discernible falling down). The outward-moving feature fades throughout C3. 01-Jul-2004 20:48 NE Expanding ragged loop front. It fades throughout C3. 01-Jul-2004 22:00 W Ragged and rather undefined loop front with an extremely faint and diffuse front ahead of it, fading very close to the inner edge of the C3 FOV. ------------------------------------------------------------------------------------ 02-Jul-2004 05:00 E Wide and diffuse loop front that develops spanning all the way from N to S Pole, surrounds a well defined loop front (PA ~ 078 - 148) and a ragged loop front (PA ~ 050 - 083) (measurements on C2 at 06:00 UT). 02-Jul-2004 05:24 N An extremely faint and diffuse front starting over the N Pole seems to cover the C2 occultor later during its evolution. It is difficult to discern whether it is related to the previous event. No significant X-ray activity reported by the time. 02-Jul-2004 05:48 SW Fairly faint and diffuse ragged loop front. 02-Jul-2004 12:24 E Very faint and ragged loop front preceded at 08:24 and 09:36 UT by a couple of blob-like fronts. 02-Jul-2004 14:00 SE Diffuse spray front preceding ragged asymmetric loop front at ~ 15:12 UT that fades throughout C2. 02-Jul-2004 17:24 SW Ragged loop front. 02-Jul-2004 20:00 W Elongated and ragged loop front developing slightly toward WNW precedes wide ragged and diffuse loop front at ~ 21:24 UT. ------------------------------------------------------------------------------------ 03-Jul-2004 05:36 E Spray-like front. Apparently twisted trailing material. 03-Jul-2004 10:36 ESE Another spray-like front. **** LASCO Data Gap on 03-Jul-2004: 16:24 - 18:24 UT **** **** SOHO out of telemetry keyhole **** **** High rate telemetry fully recovered **** ------------------------------------------------------------------------------------ 04-Jul-2004 03:36 E Fairly faint, diffuse and ragged loop front developing slightly toward ENE. It fades throughout C2. By 05:12 UT another ragged loop front, slightly wider follows, also fading throughout C2. 04-Jul-2004 06:36 SE Very faint and narrow loop front, preceding kind of asymmetric loop front that fades throughout C3. **** LASCO Data Gap on 04-Jul-2004: 15:00 - 18:36 UT **** **** End of EIT CCD bakeout. **** **** EIT resumes Observation Program at ~ 18:30 UT. **** 04-Jul-2004 20:06 W Very faint and diffuse loop front that quickly fades. ------------------------------------------------------------------------------------ 05-Jul-2004 03:30 NW Elongated and ragged (expanding) loop front. 05-Jul-2004 07:32 N Kind of 'circular' loop front accompanied by lot of gusty outflow above the NE Limb. 05-Jul-2004 13:54 WNW Very faint expanding loop fronts followed on W at 16:54 UT by a diffuse and ragged front. 05-Jul-2004 18:54 SW Spray-like front along streamer. 05-Jul-2004 19:31 SE Slow evolution of system of loops, quickly surpassed by nextevent (Halo CME). 05-Jul-2004 23:06 HALO The event was first observed in C2 at 23:06 UT already covering the occultor, much brighter in the southern hemisphere. However, close examination of its early evolution in C2, would suggest that the part corresponding to the faint front evolving above the NW limb belongs to a different event. The feature that would correspond to the Halo is first seen in C3 at 23:18 UT above the SSW limb. GOES records no significant X-ray activity, except for a couple of B-class flares: i) a B1.2 X-ray flare between 18:56 and 19:04 UT with peak emission at 19:00 UT on NOAA AR 0639 (N07W35), and ii) a B1.3 X-ray flare between 20:47 - 20:59 UT with peak emission at 20:54 UT on NOAA AR 0639 (N07W36). EIT Fe XII running difference images show signatures of an apparently backsided CME developing toward SW between 23:12 and 23:36 UT. On the other hand, an extremely faint intensity disturbance is guessed traveling toward NW apparently originated nearby NOAA ARs 0639 and 0640, starting at around 21:12 UT. The Halo CME has therefore been catalogued as backsided. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/249.html ------------------------------------------------------------------------------------- 06-Jul-2004 02:06 NE Elongated loop front in the Halo aftermath. 06-Jul-2004 04:30 ENE Kind of 'jet' preceding ragged spray-like front slightly to N in the trailing material of the Halo event reported to start at the end of previous day. 06-Jul-2004 05:30 SW Diffuse and wide loop front in the trailing material of the Halo event reported to start at the end of previous day, developing toward SSW. It is followed at 07:31 UT by a kind of 'jet'. 06-Jul-2004 10:06 NW Spray-like front. 06-Jul-2004 12:56 W Bright loop front with apparently twisted inner core and twisted trailing material, developing slightly toward WNW. Gusty outflow follows, well into next day. 06-Jul-2004 14:06 SW Kind of diffuse and asymmetric structure developing along streamer followed at 17:30 UT by a small and ragged loop front. 06-Jul-2004 18:54 NE Ragged loop front, surpassed in the C2 FOV by the following reported event (Halo CME at 20:06 UT). 06-Jul-2004 20:06 HALO Initially diffuse front followed by a bright front first seen above the SE Limb, develops as an asymmetric 'full' Halo CME by 20:30 UT (C2 time). The part of the front above the NW Limb is fainter than the rest. There is no significant X-ray activity reported by the time. Likewise EIT Fe XII images do not show any significant activity on the disk. Between 20:00 and ~21:24 UT EIT Fe XII running difference images show signatures of a big CME originated in the far side of the Sun, developing mainly toward SE. Therefore, the event has been catalogued as a 'full' Halo CME, backsided. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/250.html ------------------------------------------------------------------------------------- 07-Jul-2004 00:30 NE In the gusty outflow at NE left after the HALO event, a ragged loop front with apparently twisted inner structure develops. Faint extensions toward N and later to S (~ 02:06 UT), the latter much fainter. It fades throughout C3. It is preceded at ~ 21:54 UT (on previous day) by a loop front slightly to S. 07-Jul-2004 01:31 SE Ragged loop front. It fades throughout C3. Expanding features by 04:06 UT, developing toward the S Pole. It could be related to the faint extensions to S mentioned in previous event, though it is difficult to establish their relation, if any at all. 07-Jul-2004 12:54 E Ragged loop front that quickly fades. 07-Jul-2004 16:06 WNW System of loop fronts with apparently twisted core/ trailing material. 07-Jul-2004 18:30 NE Elongated ragged loop front. By ~ 22:30 UT a diffuse and ragged front develops within the trailing material. Gusty outflow and some ragged blob-like fronts on next day. 07-Jul-2004 18:30 ENE Ragged loop front evolving apparently jointly with the elongated loop front in previous event (though apparently a little bit slower). 07-Jul-2004 18:30 SW Initially ragged and rather undefined small front develops as a blob-like front. ------------------------------------------------------------------------------------- 08-Jul-2004 03:30 NNE Extremely faint asymmetric loop front that fades throughout C3. 08-Jul-2004 15:54 ESE Faint ragged loop front that fades throughout C3. 08-Jul-2004 20:30 ENE Ragged and elongated loop front. It fades close to the outer edge of C3 FOV. 08-Jul-2004 21:12 W Very faint and diffuse (elongated) front, developing slightly toward WNW. 08-Jul-2004 21:33 SW Extremely faint loop front. Barely visible in C3. ------------------------------------------------------------------------------------- 09-Jul-2004 00:30 ENE Bright loop front, cavity, and twisted inner core and trailing material. Due to its superposition in the LOS with event reported to start at 20:30 UT on previous day it is difficult to give an exact time of first appearance. Gusty outflow to NW well into next day. Infalling material by 19:31 UT on E. 09-Jul-2004 02:30 SW Another extrelemely faint loop front, a little bit asymmetric this time. By 05:30 UT another one (narrower than the one at 21:33 UT on previous day) develops, apparently moving faster. They fade in C3. 09-Jul-2004 06:06 W Ragged and 'thick' loop front. Kind of jet-like structure developing in parallel toward WNW. They fade throughout C3. 09-Jul-2004 17:54 WSW Very faint and ragged loop front that fades close to the inner edge of C3. Another one at ~ 22:06 UT, and also at ~ 00:54 UT on next day. ------------------------------------------------------------------------------------- 10-Jul-2004 00:54 E Ragged and diffuse loop front. It fades throughout C3. Much gusty outflow and also some infalling material along the day. 10-Jul-2004 06:30 ESE Feature that initially appears as a jet-like front develops as a narrow and ragged (faint) loop front. It fades throughout C3. Faint extensions to N. 10-Jul-2004 08:30 N Couple of diffuse and rather faint loop fronts. 10-Jul-2004 13:54 W Bright ragged loop front brighter to S, and twisted trailing material. By 16:30 UT, a faint and ragged asymmetric loop front on WSW develops slightly toward S of the bright loop front. It fades in C3. ------------------------------------------------------------------------------------- 11-Jul-2004 01:54 WSW Narrow and faint ragged loop front developing toward W. It fades close to the inner edge of C3. 11-Jul-2004 02:30 N Jet-like front that quickly fades, developing slightly toward NNW. 11-Jul-2004 03:54 NE In the gusty outflow, slow development of a faint 'V-shaped' feature. It fades throughout C3. 11-Jul-2004 10:34 N Fairly faint and ragged asymmetric loop front. It fades throughout C3. 11-Jul-2004 14:30 NE Diffuse ragged front with faint extensions above E and SE limb. It expands toward N Pole. Another front follows by 16:30 UT on NNE. They fade throughout C3. 11-Jul-2004 15:30 W Faint ragged loop front that fades throughout C2. ------------------------------------------------------------------------------------- 12-Jul-2004 05:06 W Loop front that fades close to the inner edge of C3. Faint extensions to N in C2. 12-Jul-2004 08:06 E Wide and bright loop front with cavity and twisted inner core. Trailing material. EIT Fe XII images show signatures of a huge limb event starting at ~ 07:36 UT, originated barely behind the disk. 12-Jul-2004 11:06 SW Faint and ragged elongated loop front, followed at 12:30 UT, slightly to N, by another (brighter) ragged loop front. Apparently, another one at 17:54 UT, not well defined. They fade throughout C3. 12-Jul-2004 22:30 ESE Very elongated front. ------------------------------------------------------------------------------------- 13-Jul-2004 00:54 NW Ragged loop front with faint faint extensions to S. (Faint Halo) By 01:31 UT the extensions cover the C2 occultor. Also, by 01:31 UT on NNW, bright and slower material appears developing toward NNW followed by an apparently twisted (rather circular) structure. The circular structure seems to surpass later, while still in C2, the bright material. By 05:30 UT more bright material appears above the NNW limb. GOES recorded high X-ray activity during the day. In particular, NOAA AR 0646 (by the time at N14W45), produced an M6.7 X-ray flare between 00:09 and 00:23 UT with peak emission at 00:17 UT, most likely associated to the event. EIT Fe XII shows a brightening above the aforementioned AR starting at 00:12 UT followed by a wave apparently centered in the AR. Material is seen ejected form nearby the AR toward N short after the flare. This event has therefore been determined as, at least most likely, partly Earth-directed. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/251.html 13-Jul-2004 01:54 NE Ragged loop front preceded by a fainter and more diffuse front at 01:31 UT. Difficult to characterize the event as it mixes with the faint extensions from previous event. 13-Jul-2004 06:06 WSW Faint ragged fan-like front that fades throughout C3. 13-Jul-2004 09:08 WNW Another bright ragged loop front with faint (Faint Halo) extensions to S developing in the trailing material of previous halo. During its development in C2, 2 parts are distinguishable: i) a bright ragged loop front, and ii) a fainter and diffuse front to N and ahead of the other front. By 10:06 UT the faint extensions seem to cover the C2 occultor. GOES recorded an M5.4 X-ray flare on NOAA AR 0646 (at N14W51), between 08:40 and 08:55 UT with peak emission at 08:48 UT. EIT Fe XII running difference images show signatures of the event between ~ 08:48 and 10:14 UT, showing the brightening (flare) peaking at 08:48 UT. Moreover, like in previous event, a large intensity disturbance traveling across the disk mainly toward NE is evident (wave) and also toward NW (CME signature). This event has therefore been determined as, at least most likely, partly Earth-directed. For details see: http://lasco-www.nrl.navy.mil/mail/halo_mail/252.html 13-Jul-2004 14:06 WNW Structured material slowly develops, superposed in the LOS with the trailing material of previous event. While in C2 it is surpassed by the event reported to start at 20:30 UT. 13-Jul-2004 14:30 NE Ragged loop front. Continuous outflow. 13-Jul-2004 17:54 NNE Very faint diffuse front that seems to push existent structures in the C2 FOV. Effect visible in C3. 13-Jul-2004 20:30 WNW Ragged loop front with apparently twisted inner structure preceded by a fainter and diffuse front that is first seen at 19:54 UT. GOES recorded an M6.2 X-Ray flare produced by NOAA AR 0646 (N14W56) between 19:24 - 19:36 UT with peak emission at 19:32 UT (among several others C-class X-ray flares from the same region all along the day). ------------------------------------------------------------------------------------- 14-Jul-2004 03:30 NE Kind of thick jet-like front followed by a diffuse and asymmetric ragged loop front whose northern leg matches the apparent PA of the jet. They quickly fade. 14-Jul-2004 05:06 NE Initially bright front develops as a ragged faint structure with faint extensions to S. It fades troughout C2. 14-Jul-2004 06:30 W Apparently twisted elongated structure, preceded by a kind of spray to N. It fades throughout C3. Couple of very faint and diffuse fronts follow 14-Jul-2004 12:54 NW Kind of blob-like front. **** LASCO data gap from 14:30 to 15:52 UT due to ICAL01 **** **** (intercalibration for EIT with CDS). **** 14-Jul-2004 18:54 W Faint spray. 14-Jul-2004 21:30 WSW Faint, diffuse and elongated loop front. It fades in C3. ------------------------------------------------------------------------------------- 15-Jul-2004 00:30 W Faint and very narrow expanding loop front, followed at 04:54 UT by a slightly brighter spray developing slightly toward WSW. 15-Jul-2004 02:30 SE Initially bright and narrow front along streamer accompanied by a faint and diffuse loop front to S. Very faint extensions also above the E Limb. The event fades quickly in C2 and is barely visible in C3 (toward SW). GOES recorded and X1.8 X-ray flare from NOAA AR 0649 (S09E51) between 01:30 - 01:48 UT with peak emission at 01:41 UT. 15-Jul-2004 11:30 SW Faint elongated and narrow loop front. It fades in C3. 15-Jul-2004 13:31 NNW Extremely faint and diffuse loop front preceding a faint expanding loop front at ~ 15:30 UT that fades throughout C3. 15-Jul-2004 15:08 E Very slow development of an expanding system of loops. Difficult to precise the exact time of first appearance. GOES recorded and X1.6 X-ray flare from NOAA AR 0649 (S10E43) between 18:15 - 18:28 UT with peak emission at 18:24 UT. By that time, structured and apparently twisted features develop in C2. By 22:30 UT the event spans from PA ~ 050 - 145 (C2). 15-Jul-2004 23:30 WNW Faint fan-like front followed by an elongated loop front brighter to S at ~ 01:54: UT on next day, which fades throughout C3. ------------------------------------------------------------------------------------- 16-Jul-2004 01:31 NW Extremely faint expanding loop front. 16-Jul-2004 02:54 SE Extremely faint front (barely visible) that quickly fades. GOES recorded and X1.4 X-ray flare from NOAA AR 0649 (S10E39) between 01:43 - 02:30 UT with peak emission at 02:06 UT. 16-Jul-2004 09:54 NE Ragged loop front that quickly fades. 16-Jul-2004 10:06 W Elongated and ragged loop front that fades in C3. 16-Jul-2004 12:54 E Faint expanding loop front. It fades throughout C3. 16-Jul-2004 15:54 E Bright jet-like front, followed at ~ 17:30 UT by a similar one, not that bright. A faint and ragged asymmetric half-loop front develops between the 2 jets. 16-Jul-2004 20:13 E Expanding ragged loop fronts followed at ~ 04:30 UT on next day by a faint loop front developing slightly toward ESE. ------------------------------------------------------------------------------------- 17-Jul-2004 06:30 W Extremely narrow loop front developing toward WNW. It fades close to the inner edge of C3 FOV. 17-Jul-2004 07:31 SW Very narrow and rather faint loop front that fades throughout C2. 17-Jul-2004 14:30 N Jet-like front that quickly fades. 17-Jul-2004 16:54 E Development of a rather faint loop front starts to be visible, already well above the inner edge of C2. Another one at around 19:31 UT (seems to be a kind of reconexion event: Infalling material discernible by ~20:30 UT.). By 19:54 UT follows a small ragged front that quickly fades, which in turn, is followed by a kind of of faint loop front developing toward SE (fading throughout C3). 17-Jul-2004 18:30 W Ragged loop front developing slightly toward WNW. At ~ 19:54 UT and superposed in the LOS, a not well defined loop front develops. ------------------------------------------------------------------------------------- 18-Jul-2004 01:32 SW Elongated loop front followed at ~ 05:30 UT by another expanding front aparently at the PA of its northern leg. 18-Jul-2004 12:30 E Faint and diffuse loop front that quickly fades. 18-Jul-2004 15:08 NE Ragged front just S of streamer. 18-Jul-2004 19:31 W Ragged expanding loop front. It fades throughout C3. 18-Jul-2004 20:06 E Very faint front developing superposed in the LOS with what looks like a slowly expanding system of faint loops. It is not discerned in C3. Another faint front can be discerned by 22:30 UT just appearing in C2. Extremely faint extensions can be guessed developing toward NNE. ------------------------------------------------------------------------------------- 19-Jul-2004 00:54 E Continuing last event reported on previous day, wide expanding system of faint loops. Brighter material by 05:30 UT, at the PA of the southern leg of the system of loops (SE), that develops as a ragged and elongated loop front. Gusty outflow. 19-Jul-2004 09:30 W Bright asymmetric loop front with inner core and trailing material develops toward WNW. Starting at ~08:48 UT EIT Fe XII running difference images show signatures of a big CME above the W Limb, apparently originated barely behind the disk. 19-Jul-2004 13:30 ENE Partial Halo CME. The event was first clearly Partial discerned in C2 at 13:30 UT spanning from ~ PA 320 Halo - 170, just after a short (1.5 hs) data gap. A bright loop-like feature is also seen above the ENE Limb, which develops exhibiting an apparently twisted trailing part. The event was most probably associated with complex solar activity reported by GOES, related to activity above the NOAA AR 0652, and to a lesser extent NOAA AR 0653. In particular, the C2.9 X-ray flare reported to occur between 10:47 - 10:55 UT with peak emission at 10:52 UT on AR 0652 (N07E42) was most likely associated to the event. It is also worth to mention the C2.5 X-ray flare occurred on NOAA AR 0653 (S12E52) between 13:00 - 13:22 UT with peak emission at 13:14 UT. EIT Fe XII running difference images show a brightening above AR 0652 at 10:48 UT with a dimming developing mainly NW afterward. For details: http://lasco-www.nrl.navy.mil/mail/halo_mail/253.html 19-Jul-2004 14:54 WNW Elongated bright front (dificult to establisg time of first appearance) develops as an expanding twisted structure. Starting at ~14:48 UT EIT Fe XII running difference images show signatures of a big CME above the WNW Limb, coming out from behind the disk. Gusty outflow follows, well into next day. 19-Jul-2004 19:54 E Elongated ragged loop front in the trailing material of the previous 'Partial" Halo CME. A ragged faint fan-like front follows by 20:30 UT developing slightly toward ESE. ------------------------------------------------------------------------------------- 20-Jul-2004 00:54 E Initially bright ragged loop front preceded by a faint loop front. They fade throughout C3. 20-Jul-2004 04:30 E Another ragged loop front (slightly brighter), with apparently twisted trailing material. It fades in C3. 20-Jul-2004 04:54 SE Elongated and ragged loop front along streamer. It fades throughout C3. Gusty outflow follows. 20-Jul-2004 05:30 W Elongated loop front that fades throughout C2. 20-Jul-2004 08:54 W Diffuse and faint elongated front that quickly fades. It is followed at 11:30 UT by a bright and narrow curved feature. 20-Jul-2004 13:31 N Bright loop front rising above the N Pole develops Partial as a 'partial' Halo CME. By 15:06 UT the front spans Halo in C2 ~ 164 deg, from PA ~ 280 - 084. Note also the very faint extensions developing mainly toward A and SE, and a diffuse loop front on SW. The bright loop front is first seen in the C3 FOV at 14:18 UT, while a much fainter front is also seen developing toward S and SE (already farther out), though quickly fading. Later, a wide faint front developing toward W can also be discerned. The events were associated with complex solar activity reported by GOES, related to NOAA AR 0652. That AR produced several C-class flares during the last 24 hours and one M- class flare. In particular, GOES recorded an M8.6 X-ray flare (N10E33) between 12:22 - 12:45 UT with peak emission at 12:32 UT, which was associated the bright front loop mentioned above. EIT Fe XII images show a strong brightening on the aforementioned AR starting at 12:24 UT and reaching its peak at 12:36 UT. Afterward, an intensity disturbance (wave) is seen traveling across the disk mainly toward NW. Despite the faintness of the extensions developing to S and W, it is worth to mention that, before the brightening recorded by EIT at 12:24 UT, material is seen to be ejected from the AR 0652 mainly toward SW (more precisely, starting at ~ 11:12 UT). The time coincides with a C6.0 X-ray flare recorded by GOES from NOAA AR 0652 (N03E34) between 11:01 - 11:37 UT with peak emission at 11:26 UT. Therefore, the faint extensions mentioned could probably be associated with these events. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/254.html 20-Jul-2004 14:30 NE Elongated-with-a-sharp-cusp expanding loop, followed by a similar one slightly to S (fainter) at 19:31 UT. 20-Jul-2004 18:54 NW Ragged loop front preceded by a fainter envelope in the trailing material of previous event; followed at ~23:30 UT by a kind of 'blob-like' feature. 20-Jul-2004 21:54 SE In the gusty outflow along streamer, relatively bright and elongated loop front followed at 00:30 UT on next day (a little bit to N) by a loop front. 20-Jul-2004 23:54 W Spray-like front. It fades throughout C3. ------------------------------------------------------------------------------------- 21-Jul-2004 06:06 SE Ragged loop front with fainter extension toward S followed by several ragged loop fronts (in part., at 09:06 UT). GOES recorded a C8.9 X-ray flare on NOAA AR 0652 (N03E24) between 05:05 - 05:33 UT with peak emission at 05:21 UT. EIT Fe XII running difference images show a brightening on AR 0652 starting at 05:00 UT. Material is seen to be ejected mainly toward SW. Another brightening at 08:00 UT. C3 images show the complex event developing toward SSE. 21-Jul-2004 10:54 NE Very faint and narrow loop front. Barely visible in C3. 21-Jul-2004 11:54 WNW Jet-like feature that quickly fade. 21-Jul-2004 13:31 SE In the trailing material of event reported to start at 06:06 UT, a faint and slow loop front develops (brighter to S). By 14:30 UT, a small ragged front develops above the E limb. They fade throughout C3. 21-Jul-2004 20:06 S Ragged fan-like front followed at 21:30 UT by a spray front. They both fade throughout C3. 21-Jul-2004 21:30 SE Faint ragged front. ------------------------------------------------------------------------------------- 22-Jul-2004 01:31 S An initially bright front is seen rising on the S Pole in C2, with fainter loop-like extensions above the SW Limb, and followed by much outflow on the S Limb. Later, by 05:30 UT, a ragged loop front can be discerned in the trailing material. C3 shows the development of the event as, apparently, two superposed ragged loop-like structures, one moving mainly toward S and the other slightly toward SW. Globally, the event spans in C3 ~ 100 deg at 07:42 UT, from PA ~ 140 - 240. The mean plane-of-sky speed was around 500 km/sec, as measured at PA ~ 180 and based on C3 data. GOES recorded a M9.1 X-ray flare on NOAA AR 0652 (N03E13) between 00:14 - 00:43 UT with peak emission at 00:32 UT. EIT Fe XII running difference images record a strong brightening on AR 0652 starting at 00:24 UT and peaking at 00:36 UT. Another brightening occurs at 04:00 UT. 22-Jul-2004 07:31 S Complex Event: Basically, at 07:31 UT a bright (HALO) narrow feature appears above the S Pole in C2, preceding the development of an asymmetric loop front at the S Pole with faint loop-like extensions above the SW Limb. By that time, an extremely faint and diffuse arcade-like front can be discerned in C2 developing mainly toward NE, jointly with another similar one toward NW. Their faintness makes it difficult to establish the exact time of first appearance. On the other hand, C3 shows, starting at 07:42 UT, the development of a faint and diffuse wide loop front on NNE; and starting at 08:42 UT a wide ragged loop front developing on SSW. The former seems to surround later the occultor. The mean plane-of-sky speed was around 913 km/sec, as measured at PA ~ 210; and ~ 652 km/sec as measured at PA ~ 30 (based on C3 data). GOES recorded by the time several C-class X-ray flares on NOAA AR 0652: C1.7 (N05E13) between 06:33 - 06 43 UT; Peak at 06:38 UT C2.1 (N04E12) between 06:54 - 07:07 UT; Peak at 07:00 UT C5.5 (N03E08) between 07:41 - 08:10 UT; Peak at 07:59 UT Fe XII running difference images show discernible brightenings on AR 0652 at 06:36 UT and 07:48 UT (no images between 06:48 - 07:13 UT). This event has therefore been determined, from a global point of view, as a faint 'full' halo CME frontsided. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/255.html 22-Jul-2004 08:54 SW Ragged loop front that fades throughout C2. 22-Jul-2004 11:54 S Diffuse and ragged loop front followed at 12:30 UT by a small bright front and gusty outflow. At ~ 14:30 UT in the gusty outflow begins to be discernible a loop front. It fades throughout C3. 22-Jul-2004 13:54 WNW Very faint elongated and ragged loop front. It fades throughout C2. 22-Jul-2004 17:54 NNE Faint and diffuse jet-like front that quickly fades. 22-Jul-2004 17:54 S Spray front followed at ~ 19:34 UT by a kind of asymmetric loop front. They both fade throughout C3. C3.2 X-ray flare on NOAA AR 0652 (N04E07) between 17:17 - 17:37 UT (Peak at 17:24 UT). 22-Jul-2004 23:54 SSW Diffuse and not well defined loop front. At 00:06 UT on next day, bright narrow feature superposed with the loop's leg on the S Pole. Gusty outflow follows toward S. At 01:54 and 02:30 UT couple of asymmetric loop fronts developing toward SSW. C3 shows a very faint front developing mainly toward SW, which is first seen at 00:42 UT. GOES recorded a couple of C- and one M-class X-ray flares on NOAA AR 0652: C4.1 (N03E04) between 22:01 - 22:18 UT; Peak at 22:12 UT M1.6 (N04E03) between 22:40 - 23:07 UT; Peak at 22:58 UT C1.3 (N03E02) between 23:09 - 23:45 UT; Peak at 23:21 UT Fe XII running difference images show discernible brightenings on AR 0652 at 22:12 UT and 23:24 UT (no images between 22:36 - 23:12 UT). ------------------------------------------------------------------------------------- 23-Jul-2004 03:30 W Very very slow development of an apparently twisted structure. Exiting C2 FOV by the end of the day. 23-Jul-2004 03:54 E Ragged loop front. Superposed with it, a very diffuse and faint loop-like feature seems seems to develop, moving faster. Barely visible in C3. 23-Jul-2004 07:31 SW Diffuse and not well defined loop front (difficult to give an exact time of first appearance). A faint and diffuse loop-like front follows, starting at ~ 08:30 UT above the W Limb. C3 shows a faint front (though a little bit brighter than that of previous event on SW) developing mainly toward SW and spanning about 90 deg (first seen in C3 FOV at 08:18 UT). GOES recorded a couple of C-class X-ray flares by the time: C2.3 (N03W04) between 06:41 - 07:02 UT; Peak at 06:48 UT C4.3 (N03W04) between 07:17 - 07:36 UT; Peak at 07:26 UT Fe XII running difference images show discernible brightenings on AR 0652 at 06:48 UT and 07:36 UT. 23-Jul-2004 16:06 W COMPLEX HALO CME: At 16:06 UT a very faint and HALO diffuse loop-like front is first seen (just barely) above the W Limb in C2, becoming rather bright and wide at 16:30 UT. Close inspection of the development of the event in C2 show that several features contribute to the evolution of the global pattern later observed, i.e.: i) a very wide and diffuse arcade-like front (most likely related to [a] -see below-). It is first seen in C3, above the W Limb, at 16:42 UT. Mean plane-of-sky speed at PA ~ 270: ~990 km/sec (though very poor measurement due to the diffuseness of the leading edge, based on C3 data). ii) a ragged front that first appears at 17:54 UT above the WSW Limb (most likely related to [b]). It is first seen in C3, above the WSW Limb, at 18:18 UT. Mean plane-of-sky speed at PA ~ 245: 540 km/sec (based on C3 data, LE of brightest feature). iii) another ragged front first seen above SW between 18:54 - 19:31 UT (most likely related to [c]). It is first seen in C3, above the SW Limb, at 19:42 UT, though still almost hidden by feature in ii). Mean plane-of-sky speed at PA ~ 204: 621 km/sec (based on C3 data, LE of brightest feature, last point at ~ 11 solar radii). GOES recorded by the time a couple of C- and one M-class X-ray flares on NOAA AR 0652: [a] C1.0 (N05W04) between 16:03 - 16:15 UT; Peak at 16:09 UT [b] M2.3 (N03W10) between 17:08 - 17:37 UT; Peak at 17:28 UT [c] C4.1 (N03W05) between 18:02 - 18:11 UT; Peak at 18:07 UT Among significant features observed in Fe XII running difference images it is worth to mention: i) a kind of jet-like brightening at 16:12 UT on NOAA AR 0652 and developing toward SW [a], and ii) a strong brightening [b] on the same AR at 17:24 UT with associated ejecta of material toward SW (ejecta that seems to disturb -push toward S- some loops on SW of the AR 0652); by 18:36 UT the loop system is no longer discernible). See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/256.html 23-Jul-2004 22:30 SW Slow development of a circular and twisted structure superposed in the LOS with the trailing material of event reported to start between 18:54 - 19:31 UT (see previous event). By 05:54 UT on next day, is already seen very well defined in C2 (kind-of 'flux rope' event). ------------------------------------------------------------------------------------- 24-Jul-2004 00:30 NW Bright loop front with apparently circular twisted inner core (kind of 'flux rope' event). Twisted trailing material. Gusty outflow. 24-Jul-2004 01:31 NNW Diffuse fan-like front. It fades throughout C2. 24-Jul-2004 01:54 E Ragged loop front developing slightly toward ESE. It fades close to the inner edge of C3 FOV. 24-JUl-2004 03:54 SSW Ragged front to S of flux-rope reported at 22:30 UT on previous day, followed at 06:54 by another ragged front and some gusty outflow. 24-Jul-2004 11:06 E Small ragged front apparently preceded by a faint and elongated expanding loop front. 24-Jul-2004 18:54 ESE Very faint asymmetric loop front. It fades throughout C2. 24-Jul-2004 19:31 W Faint ragged loop front. It fades throughout C3. 24-Jul-2004 22:30 NW Ragged loop front that quickly fades. GOES recorded a C1.4 X-ray flare from NOAA AR 0652 (N10W21) between 21:59 - 22:15 UT with peak emission at 22:07 UT. 24-Jul-2004 23:54 SW Bright loop front developing toward SSW, trailing twisted structure. By the time, a faint and diffuse loop front develops toward SW. The latter is seen a little bit ahead. GOES recorded a C2.7 X-ray flare from NOAA AR 0652 (N03W26) between 23:11 - 23:32 UT with peak emission at 23:22 UT. ------------------------------------------------------------------------------------- 25-Jul-2004 06:30 NW Small ragged fronts along streamer. They fade in C2. GOES recorded a M7.1 X-ray flare from NOAA AR 0652 (N10W30) between 05:39 - 05:58 UT with peak emission at 05:51 UT. 25-Jul-2004 13:31 WSW Faint asymmetric loop front surpassed by next event. 25-Jul-2004 14:30 SW Extremely bright loop front develops as a 'full' halo CME: By 15:30 UT, faint extensions in the western hemisphere, and even fainter ones on the N Pole surround the C2 occultor. A fainter second front is seen to appear later above the SW Limb in C2, at 15:54 UT. Gusty outflow follows at PA around 225. The event is first seen in C3 at 15:18 UT above the SW Limb. By 15:52 UT, faint extensions already surround the C3 occultor. For reference, the mean plane-of-sky speeds at PA 145 was ~ 1280 km/sec (based only on C3 data). A protons storm accompany the development of the event (and outlast it). GOES recorded by the time a couple of M- and one C-class X-ray flares on NOAA AR 0652: C2.1 (N04W29) between 13:18 - 13:32 UT; Peak at 13:25 UT M2.2 (N04W30) between 13:37 - 13:55 UT; Peak at 13:49 UT M1.1 (N08W33) between 14:19 - 16:43 UT; Peak at 15:14 UT Among significant features observed in Fe XII running difference images it is worth to mention: i) a moderate brightening at 13:26 UT on NOAA AR 0652, signature of the C2.1 X-ray flare; ii) a strong brightening on the same AR at 13:48 UT (signature of the M2.2 X-ray flare) with associated ejecta of material toward SW (ejecta that seems to disturb -push toward S- some loops on SW of the AR 0652); and iii) another couple of brightenings in the same AR peaking by 15:00 UT and 16:00 UT (most likely signatures of the relatively long duration M1.1 X-ray event). Please also note that at 14:48 UT, an expanding system of loops develops on the WSW Limb, apparently with its source just behind the limb (by 16:00 UT post-flare loops can be discerned raising from behind the limb). The event has therefore been determined as a complex 'full' halo CME, frontsided. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/257.html 25-Jul-2004 19:54 SSW Elongated loop front in the trailing material of previous event. Much gusty outflow to N (on SW). 25-Jul-2004 21:54 NW Very slow development of a system of loops. Difficult to give an exact time of first appearance. 25-Jul-2004 22:30 ENE Very faint ragged fan-like front that quickly fades. ------------------------------------------------------------------------------------- 26-Jul-2004 00:30 WNW Slowly expanding system of loops. 26-Jul-2004 00:30 SSW Ragged loop front. It fades throughout C3. 26-Jul-2004 02:30 SE Small and faint loop front that quickly fades. 26-Jul-2004 04:30 SW Elongated ragged loop front in the gusty outflow left by event on previous day. It fades throughout C3. More gusty outflow with some small ragged fronts along the day. 26-Jul-2004 09:30 E Very faint elongated loop front, barely visible in C3. 26-Jul-2004 12:30 S Jet that quickly fade. 26-Jul-2004 18:06 SW Kind of 'explosive' ragged front preceded at ~16:30 UT by an extremely faint spray-like front above the WSW Limb. Much high energy protons follow in the C2 FOV. Some in C3. The event fades throughout C3. Several small ragged fronts follow at the end of the day. GOES recorded a M1.1 X-ray flare from NOAA AR 0652 (N04W47) between 17:23 - 17:37 UT with peak emission at 17:30 UT, and a C4.7 (N11W50) between 16:50 - 17:11 UT with peak emission at 16:59 UT. ------------------------------------------------------------------------------------- 27-Jul-2004 00:30 NW Expanding loop front (brighter to N) pushing loop structures ahead of it. Rather faint in C3. GOES recorded a M1.4 X-ray flare from NOAA AR 0652 (N11W52) between 23:47 (on 7/26) - 00:20 UT with peak emission at 00:00 UT. 27-Jul-2004 03:54 SW Couple of faint ragged loop fronts (brighter to S). 27-Jul-2004 06:06 SW Bright ragged loop front (brighter to S), faint extensions to N. Apparently twisted trailing material. GOES recorded a M1.1 X-ray flare from NOAA AR 0652 (N04W54) between 05:41 - 05:52 UT with peak emission at 05:45 UT. 27-Jul-2004 11:54 NE Slowly expanding system of loops (and diffuse front superposed in the LOS) develops, slightly towards NNE. Another loop front starts to be discerned by 18:30 UT. 27-Jul-2004 14:06 SW Couple of ragged loop fronts. 27-Jul-2004 15:54 SW Another bright ragged loop front (brighter to S), faint extensions to N. Apparently twisted trailing material. Similar to that at 06:06 UT. By the time, GOES recorded from NOAA AR 0652 a: - C3.0 X-ray flare (N04W58) between 15:01 - 15:11 UT with peak emission at 15:07 UT. - C2.8 X-ray flare (N03W58) between 15:21 - 15:36 UT with peak emission at 15:25 UT. Small ragged loop front follos at ~17:30 UT on WSW. 27-Jul-2004 15:54 NE Ragged elongated looop front at PA that apparently matches that of the southern leg of event reported to start at 11:54 UT, developing slightly toward ENE. 27-Jul-2004 20:06 W Just a small loop front followed at ~ 20:58 UT by a very diffuse brightening above the W limb, both quickly fading. GOES recorded a M1.5 X-ray flare from NOAA AR 0652 (N10W64) between 19:59 - 20:37 UT with peak emission at 20:20 UT. 27-Jul-2004 23:30 SW Another bright ragged loop front (brighter to S; narrower than previous events), faint extensions to N. Apparently twisted trailing material. By the time, GOES recorded from NOAA AR 0652 a: - C2.9 X-ray flare (N04W63) between 22:27 - 22:36 UT with peak emission at 22:33 UT. - C1.1 X-ray flare (N02W64) between 22:52 - 23:02 UT with peak emission at 22:57 UT. ------------------------------------------------------------------------------------- 28-Jul-2004 00:06 NE In the trail of event reported to start at 11:54 UT on previos day, a faint loop front (apparently moving faster) develops. At ~ 02:30 follows a relatively bright and narrow front. Gusty outflow. 28-Jul-2004 02:30 W Wide event. A diffuse loop front appears above the W Limb becoming very bright by 03:30 UT. A cavity and bright inner core follow. By 06:54 UT a ragged and elongated loop front follows, at the PA of the southern leg of the wide loop front (on SW Limb). During the development in C2. very faint material above the SE limb is seen to be pushed aside (shock?). In C3, faint expanding extensions are seen above the N Pole and on SE. GOES recorded a long duration C4.4 X-ray event on NOAA AR 0652 (N03W81) between 02:32 - 08:03 UT with peak emission at 06:09 UT. During its rising phase a C2.0 X-ray flare was recorded from N09W67 between 02:57 - 03:07 UT with peak emission at 03:03 UT. 28-Jul-2004 14:06 SW Kind-of half loop front. It is preceded at 12:30 UT (slightly to S) by a faint and diffuse ragged front that quickly fades. By that time a faint loop front and gusty outflow develop above the W Limb. GOES recorded on NOAA AR 0652 a : - C3.0 X-ray flare (N02W72) between 11:41 - 11:53 UT with peak emission at 11:47 UT. - C1.2 X-ray flare (N05W72) between 13:35 - 13:46 UT with peak emission at 13:38 UT. 28-Jul-2004 15:54 SW Another kind-of half loop front, similar to the previous one. Trailing material. GOES recorded on NOAA AR 0652 a: - C3.6 X-ray flare (N04W74) between 15:28 - 15:36 UT with peak emission at 15:34 UT. - C3.3 X-ray flare (N12W75) between 16:08 - 16:33 UT with peak emission at 16:27 UT. 28-Jul-2004 19:32 SW Narrow ragged front that quickly fades. Faint expanding loops superposed in the LOS. 28-Jul-2004 21:54 SW Bright elongated loop front. A curved feature (kind of half loop front) evolves in parallel to N, which is seen in C3 as an expanding loop developing toward WSW. By 22:30 UT a ragged front is discerned a little bit to S. GOES recorded a C1.6 X-ray event on NOAA AR 0652 (N04W77) between 21:27 - 21:36 UT with peak emission at 21:33 UT. Small ragged fronts into next day. 28-Jul-2004 22:30 SE Diffuse loop front. It fades in C3. Very slowly expanding system of faint loops to S afterward. ------------------------------------------------------------------------------------- 29-Jul-2004 06:54 SW Bright elongated loop front (brighter to S). GOES recorded a C1.1 X-ray flare on NOAA AR 0652 (N05W83) between 06:22 - 06:26 UTwith peak emission at 06:26. 29-Jul-2004 10:54 WSW Ragged front later surpassed by event at 11:54 UT. GOES reported a B6.8 X-ray flare on NOAA AR 0652 between 09:56 - 10:15 UT with peak emission at 10:04 UT. 29-Jul-2004 11:54 WSW Very bright and wide loop front with bright inner core. Faint extensions develop on SE and NW (shock?). GOES reported a long duration C2.1 X-ray flare on NOAA AR 0652 between 11:42 - 14:02 UT with peak emission at 13:02 UT. EIT Fe XII shows a filament eruption between 11:12 - 11:48 UT right above the W Limb nearby AR 0652. Material is seen to be pushed toward S. Coming back to C2, starting at 16:06, expansion of trailing features and much gusty outflow that last through well into next day. GOES reported a C2.8 X-ray flare on NOAA AR 0652 (N03W86) between 16:28 - 16:38 UT with peak emission at 16:33 UT. Mean plane-of-sky speed (based on C3 data) at PA ~ 250 was ~ 1320 km/sec showing practically no acceleration. 29-Jul-2004 14:30 E Extremely faint (barely visible at the beginning) front slowly develops (the core of previous event is already out of C2 FOV). By 16:30 UT the front seems to span from the NW limb to the S Pole, though it is difficult to say much due to the trailing material of previous event superposed in the line of sight on NW. ------------------------------------------------------------------------------------- 30-Jul-2004 00:30 SW Kind of half loop front (loop seen almost edge on?). It fades throughout C3. Much gusty outflow, before and after. GOES reported a C1.0 X-ray flare on NOAA AR 0652 (N06W90) between 23:54 (on 7/29) - 00:14 UT with peak emission at 00:12 UT. 30-Jul-2004 06:30 SW Couple of ragged fronts in the gusty outflow. 30-Jul-2004 08:30 ENE Faint and narrow expanding loop front. 30-Jul-2004 09:30 N Expanding ragged loop front slowly developing. A faint and diffuse front seems to develop toward NE. They fade throughout C3. A kind of very long jet develops on NNW, fading throughout C2. 30-Jul-2004 16:30 WSW Faint elongated and ragged loop front. It fades throughout C3. 30-Jul-2004 23:54 WSW Very faint elongated and ragged loop front that also fades throughout C3. ------------------------------------------------------------------------------------- 31-Jul-2004 05:30 W Very bright and wide loop front with bright inner core (Limb event). It practically covers the whole western hemisphere (C2) by 08:06 UT. By 09:42 UT faint extensions surrounding the C3 occultor (shock?) can be discerned (by that time, the LE of the event on the western hemisphere is almost at the end of the C3 FOV). Gusty outflow on SW-WSW follows, all along the day. Mean plane-of-sky speed (based on C3 data) at PA ~245 was ~ 1346 km/sec. GOES reported a C8.4 X-ray flare on N05W89 (NOAA AR 0652) between 05:16 - 09:14 UT with peak emission at 06:57 UT. Another X-ray follows (C5.3) on N12W88 between 10:35 - 11:49 UT with peak emission at 11:01 UT. 31-Jul-2004 06:54 SE Asymmetric and rather narrow loop front. At ~ 10:34 follows a faint and narrow expanding loop front (slightly to N). A V-shaped front discernible at ~ 13:54 UT. 31-Jul-2004 22:30 SW Small ragged front that fades throughout C3. ===================================================================================== 01-Aug_2004 01:54 E Faint expanding loop front followed by a similar one at 03:54 UT. 01-Aug_2004 12:30 W Very slow development of a loop front. A faint, diffuse and undefined front seems to develops by the time (slightly faster), superposed in the LOS with the loop front. The loop front develops as a typical 'flux-rope' event. 01-Aug_2004 18:30 E Very faint spray-like front. It fades throughout C2. ------------------------------------------------------------------------------------- 02-Aug-2004 03:06 ESE Very faint and elongated loop front. It fades throughout C3. 02-Aug-2004 14:30 SE Very faint and diffuse front precedes development of an expanding ragged loop front that fades throughout C3. Spray-like front by 19:31 UT. 02-Aug-2004 16:30 N Extremely faint and barely visible small front develops as a very faint loop front that fades throughout C3. 02-Aug-2004 23:06 E Ragged loop front developing slightly toward ENE. It fades throughout C2. 02-Aug-2004 23:06 S Jet-like front that quickly fades. ------------------------------------------------------------------------------------- 03-Aug-2004 00:54 W Very faint jet-like front that quickly fades, developing slightly toward WSW. 03-Aug-2004 04:54 E Faint loop front that quickly fades. 03-Aug-2004 09:30 SE Extremely faint (barely visible) loop front preceding an expanding faint loop front by around 12:30 UT (difficult to give an exact time due to its faintness). Another one at 16:06 UT. They all fade throughout C2. ------------------------------------------------------------------------------------- 04-Aug-2004 01:31 E Ragged narrow front followed at 01:54 UT on ENE by a ragged loop front. They both quickly fade in C2. 04-Aug-2004 04:30 E Another narrow front immediately followed on ENE by a ragged loop front. They fade throughout C2. Another ragged loop front on ENE at 05:54 UT, that also quickly fades. 04-Aug-2004 08:54 NE Elongated ragged front along streamer. It fades throughout C3. 04-Aug-2004 11:30 ENE Diffuse and ragged front precedes an initially bright ragged loop front by 13:31 UT. By the time, an elongated and faster front develops a little bit to N, along streamer. 04-Aug-2004 16:06 NE Another elongated front develops along streamer. A ragged loop front develops a little bit to S by the time. A faint loop follows above the E Limb at 16:54 UT. 04-Aug-2004 18:30 ENE Elongated ragged loop front followed at 20:06 UT (a little bit to S) by an expanding asymmetric loop front brighter to N. ------------------------------------------------------------------------------------- 05-Aug-2004 07:54 ENE Kind of half loop front. It fades throughout C3. 05-Aug-2004 12:30 WSW Very faint and diffuse elongated front. **** LASCO data gap from 14:00 to 15:30 UT due to ICAL01 **** **** (intercalibration for EIT with CDS). **** 05-Aug-2004 16:30 E Very faint spray-like front that fades troughout C2. 05-Aug-2004 17:06 E Kind of blob-like front already close to the end of the C2 FOV when discernible. It fades throughout C3. 05-Aug-2004 21:30 ENE Ragged loop front. It fades throughout C3. ------------------------------------------------------------------------------------- 06-Aug-2004 00:54 E Elongated and extremely faint expanding feature. 06-Aug-2004 09:54 W Slow development of a loop front, with a diffuse helmet-shaped front ahead of it. By 20:30 UT (C2 time) it is clearly seen as a well developed flux- rope CME (LE at the end of the C2 FOV). Twisted trailing material. Much gusty outflow well into next couple of days. 06-Aug-2004 15:06 E Elongated and faint loop front developing slightly toward ENE. ------------------------------------------------------------------------------------- 07-Aug-2004 05:30 ENE Bright ragged loop front with structured interior and twisted trailing material. Gusty outflow well into next day. 07-Aug-2004 15:30 W In the gusty outflow, faint elongated loop front. ------------------------------------------------------------------------------------- 08-Aug-2004 08:54 W Ragged loop front developing jointly with following (Halo) event. EIT Fe XII running diference images show an extremely faint ejection a little bit to N of NOAA AR 0655 starting at around 05:48 UT and developing toward W. For details see also: http://lasco-www.nrl.navy.mil/mail/halo_mail/258.html 08-Aug-2004 08:54 HALO Bright and wide loop front above the E Limb with extensions surrounding completely the C2 occultor (fainter above the NW Limb). Some trailing material is seen by 09:30 UT above the NE Limb). A fainter and diffuse front can be discerned a little bit ahead of the bright loop front spanning from ~ PA 060 - 150. The event is first seen in C3 at 09:18 UT appearing above the E Limb, though faint extensions already surround the C3 occultor. The mean plane-of-sky speed was ~ 860 km/sec at PA 085. EIT Fe XII running difference images show the development of a backsided CME above the ENE Limb between ~ 08:24 - 10:38 UT. A faint intensity disturbance is seen travelling to S, above the limb. No significant X-ray activity could be associated to the event. The event has been characterized as a 'full' halo CME, backsided. For more details: http://lasco-www.nrl.navy.mil/mail/halo_mail/258.html 08-Aug-2004 09:54 SW In the HALO aftermath, a wide ragged loop front can be discerned, one leg (the brighter one) on SE. A narrower one follows on SW at 10:34 UT. 08-Aug-2004 12:30 ENE Loop front that quickly fades. It is followed by another loop front at ~ 14:54 UT. By the time this second front fades (~ 17:54 UT) another loop front becomes visible, already at the end of the C2 FOV. This last one fades throughout C3. 08-Aug-2004 16:06 SSW Jet-like front that quickly fades. 08-Aug-2004 21:54 SE Ragged and not well defined loop front with structured interior becomes discernible. Difficult to give an exact time of first appearance. 08-Aug-2004 22:30 E Faint loop front developing toward ESE. ------------------------------------------------------------------------------------- *** On 09-Aug-2004 there was much gusty outflow (and several small and ragged *** *** loop fronts that fade throughout C3 -some of those best discerned reported *** *** below-) on the EASTERN hemisphere all along the day and into next day. *** *** It is most likely associated with C-class X-ray activity from NOAA AR 0656 *** *** (~ 14 C-class X-ray flares from that AR reported on this day). *** 09-Aug-2004 00:30 SE Curved feature expanding towards S. 09-Aug-2004 03:30 SE Ragged loop front followed at ~ 05:30 UT by another one. 09-Aug-2004 05:06 E Faint expanding loop front. Another one can be guessed ahead of it. 09-Aug-2004 06:30 WNW Fast spray-like front followed at 09:06 UT by an elongated and expanding loop front. 09-Aug-2004 10:30 SW Extremely faint asymmetric loop front. It fades throughout C3. 09-Aug-2004 10:30 W Slow development of a twisted structure (difficult to give an exact time of first appearance), superposed in the LOS with a diffuse and undefined front moving faster. Twisted trailing material. Some inflows on next day. 09-Aug-2004 12:30 ESE Faint ragged and elongated loop front. 09-Aug-2004 15:54 ENE Couple of elongated ragged fronts (one developing toward E and the other toward ENE). ------------------------------------------------------------------------------------- *** On 10-Aug-2004 the gusty outflow likely associated to high activity on *** *** NOAA AR 0655 slowly shifts toward SE, in correlation to the passage of *** *** that AR. Again several faint and elongated ragged loop fronts that fade *** *** throughout C3 (those best discerned reported below). *** 10-Aug-2004 02:06 ESE Faint and elongated ragged front. A similar one on SE. 10-Aug-2004 05:06 E Elongated ragged front. 10-Aug-2004 07:54 SE Another couple of narrow and ragged loop fronts. 10-Aug-2004 13:31 S Diffuse front on SSE that quickly fades, immediately followed by an asymmetric loop front above the S Pole. Expanding curved feature (toward SW) ahead. They fade in C3. 10-Aug-2004 16:30 W Relatively bright ragged front and some trailing material. 10-Aug-2004 16:30 SE System of expanding loops, spanning up to above the S Pole. Faint extensions on SW (clearly seen at 20:30 UT) make it difficult to disentangle its development from that of the event reported to start at 16:30 UT on the W Limb. Please note that those faint extensions on SW are seen to move faster than the system of loops. Those 'extensions' seem to be related to a faint CME starting at around 16:12 UT in EIT Fe XII running difference images, developing mainly toward SW. 10-Aug-2004 21:54 ESE Faint and thin expanding loop front (slow). 10-Aug-2004 21:54 E Narrow loop front already close to the end of C2 FOV when discerned, followed at 23:30 UT by a kind of thick jet front that quickly fades, a little bit to S. By 23:54 UT, another narow ragged loop front follows at roughly the PA of the first one. ------------------------------------------------------------------------------------- *** On 11-Aug-2004 the gusty outflow likely associated to high activity on *** *** NOAA AR 0655 slowly shifts toward SSE, in correlation to the passage of *** *** that AR. Moreover, the very slow development of a faint system of thin *** *** loops can be followed on SSE since early in the day. Several faster *** *** events superpose later, in the LOS, during its development. The slow *** *** expansion continues all along the day spanning up to SW, and into next *** *** day. Barely visible in C3. *** 11-Aug-2004 04:54 ESE Faint and thin expanding loop front (slow). 11-Aug-2004 04:54 W Ragged front that fades close to the inner edge of C3. An extremely faint ragged front follows at ~ 08:54 UT. 11-Aug-2004 06:54 ENE Initially bright spray-like front that fades throughout C3. 11-Aug-2004 07:31 S Not well defined faint and diffuse front(s), spanning all above the SE Limb. By 08:54 UT, a couple of ragged fronts is discerned on SE (first seen in C3 by 10:20 UT), followed by kind of reconexion event at ~ 10:06 UT at around 3 solar radii from sun center (PA ~ 135): a small feature moving out and another one falling down. Gusty outflow afterward on SE and some discernible ragged fronts along the day. 11-Aug-2004 08:30 S Narrow loop front developing slightly toward SSW. 11-Aug-2004 11:30 ENE Another spray-like front that fades close to the inner edge of C3. A faint and narrow ragged front follows at ~ 12:30 UT a little bit to S. 'Gusty' infalling material through the rest of the day. ------------------------------------------------------------------------------------- *** On 12-Aug-2004 the system of faint expanding loop fronts continue all *** *** over the S Pole. Some rather well discerned fronts reported below. *** *** Morphology observed most likely related to activity on NOAA AR 10656. *** 12-Aug-2004 04:54 NNE Faint and diffuse elongated loop front followed at 06:30 UT by a very narrow (jet-like) loop front. They both fade throughout C2. 12-Aug-2004 06:54 SSW Faint loop front becomes discernible, and followed at 08:30 UT by another one at around the PA of the leg on the S Pole. The second loop fades throughout C2; the other one fades throughout C3. 12-Aug-2004 10:30 SE Ragged small front becomes discernible. 12-Aug-2004 12:06 WNW Very slow development of a ragged and structured feature. Difficult to give an exact time of first appearance. By the end of the day the outermost part of the LE is only at ~ 3.78 solar radii. 12-Aug-2004 11:54 E Blob like front becomes visible. Infalling material. The 'blob' fades throughout C3. 12-Aug-2004 12:30 SSE A faint and slow expanding loop front similar to that one at 06:54 UT starts to be visible. By 14:54 UT is well discerned. It fades throughout C3. 12-Aug-2004 14:54 SW Very faint and not well defined expanding front becomes discernible. At 16:30 UT an initially faint front on SSW develops into curved structures expanding toward SW. It seems to follow the evolution of the event reported to start at 12:30 UT. 12-Aug-2004 17:30 NNE Kind-of long jet followed by a faint narrow fan- like front at ~ 20:30 UT. 12-Aug-2004 18:30 N Jet-like front that quickly fades developing slightly toward NNW. 12-Aug-2004 18:54 NNE Another jet-like front that quickly fades, to N of event reported to start at 17:30 UT. 12-Aug-2004 20:30 SSW Apparently another faint expanding front. ------------------------------------------------------------------------------------- *** During 13-Aug-2004 a system of faint expanding loop fronts develops *** *** since early on the day above the W Limb, partly superposed with the slow *** *** event reported at 12:06 Ut on previous day. Difficult to say whether it *** *** is the same event or not. *** 13-Aug-2004 00:30 WNW Fast ragged loop front superposed in the LOS with the ragged structure reported at 12:06 UT on previous day. It fades throughout C3. 13-Aug-2004 00:54 N Jet-like front that fades throughout C2. 13-Aug-2004 02:54 S More faint curved structures expanding toward SW. **** LASCO-C2 Data Gap between 15:30 - 18:48 UT **** 13-Aug-2004 19:36 SSW Bright and narrow ragged loop front. Fainter loop- like extensions over the S Pole. The narrow loop seems to 'drag' the extensions during its develop- ment. Development of loop-like structures continues well into next day all above the SW Limb. 13-Aug-2004 20:30 WNW Diffuse and elongated loop front followed at 22:30 UT by another not well defined front later expanding slightly toward N. ------------------------------------------------------------------------------------- *** On 14-Aug-2004 a system of faint expanding loop fronts continue all *** *** over the SW Limb. Some rather well discerned fronts reported below. *** *** Morphology observed most likely related to activity on NOAA AR 10656. *** 14-Aug-2004 01:54 W Faint expanding loop structure becomes discernible, followed by a couple of similar expanding structures at 03:54 UT and 05:54 UT. **** LASCO-C2 Data Gap between 02:30 - 13:54 UT **** 14-Aug-2004 11:54 NE Jet like front. It fades throughout C2. 14-Aug-2004 19:54 SW System of wide loop fronts, most likely related to M-class X-ray activity on NOAA AR 10656. ------------------------------------------------------------------------------------- *** On 15-Aug-2004 there is still a continuous development of expanding *** *** loop-like fronts on SW all along the day, most likely associated with *** *** M-class X-ray activity on NOAA AR 10656. *** 15-Aug-2004 06:06 NW Faint expanding loop front. 15-Aug-2004 09:30 W Faint narrow loop front already close to the end of C2 FOV when discernible. It fades throughout C3. 15-Aug-2004 19:54 WSW+ Faint and diffuse elongated front. It fades throughout C3. ------------------------------------------------------------------------------------- *** On 16-Aug-2004 there is still a continuous development of expanding *** *** loop-like fronts on SW all along the day, most likely associated with *** *** X-ray activity on NOAA AR 10656. *** 16-Aug-2004 00:30 SW Relatively narrow loop-like feature with a faint and diffuse expanding (and wider) loop front ahead. By 06:30 UT becomes discernible an inner structure in the form of a narrower loop front with a bright top. 16-Aug-2004 06:06 ESE Faint and small loop front that quickly fades. 16-Aug-2004 12:30 WNW Bright loop front and twisted inner material (HALO) followed later by much gusty outflow. By 12:54 UT extremely faint extensions begin to be visible above the N Pole. By 14:30 UT, barely N of the northern leg of the loop feature, a faint expanding front seems to develop. The loop structure is first seen in C3 at 13:42 UT above the WNW Limb. By 16:18 UT extremely faint extensions already surround the occultor. The mean plane-of-sky speed for the LE of the loop front at PA ~ 286 was ~ 550 km/sec (based only on C3 data). Starting at 11:48 UT, EIT Fe XII running difference images show signatures of a CME originated, at most, a few days behind the limb, and developing above the WNW Limb (most likely the C2 loop front counterpart). Between 12:00 - 12:12 UT inner material begins to be seen (most likely counterpart of the twisted inner material seen in C2). Also by 12:12 UT, a faint and diffuse loop arise and seems to develop with a different angle respect to the plane of sky than that of the loop front. Globally, the event could therefore be determined as a very asymmetric and faint 'full' halo CME, backsided. However, given the apparent origin of the event, an Earthside component cannot be disregarded. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/259.html 16-Aug-2004 16:06 NW Small ragged fronts in the trailing material of the loop front at 12:30 UT (northern leg). In particular, at around: 16:06, 17:54, 18:54, and 20:54 UT. 16-Aug-2004 18:30 WNW Elongated loop front becomes visible in the trailing material of the loop front at 12:30 UT (southern leg). It is followed by a similar one at 20:06 UT. Gusty outflow well into next day. 16-Aug-2004 23:54 WNW More ragged fronts. ------------------------------------------------------------------------------------- 17-Aug-2004 06:06 SE Bright loop front (1) with cavity and twisted inner core (2). A Very faint front (3) develops above the NE and N limbs, starting at ~ 08:06 UT. By 11:06 UT a relatively bright narrow front (4) becomes discernible in the trailing material (SE) developing as an apparent circular and twisted structure. Gusty outflow follows. EIT Fe XII images show the eruption of a transequatorial filament (2) connecting NOOA AR 10661 with region at around S10E20, between 03:48 - 06:12 UT. The ejection develops toward SE. By 05:48 UT the filament is already shown in emission. A big loop front (arcade) (1) can be seen accompanying the development of the filament ahead of it. Between 05:48 - 07:13 UT ejecta from NOAA AR 10661, most likely related to (3). GOES recorded a C1.8 X-ray flare from NOAA AR 10661 (N05E23) between 10:44 - 10:50 UT with peak emission at 10:47 UT. Timing makes the X-ray event likely associated to (4). 17-Aug-2004 09:30 WSW Small ragged front becomes discernible in the gusty outflow. Another one at ~ 14:30 UT, a little bit to S. They both fade throughout C3. 17-Aug-2004 18:55 NE Faint elongated and narrow front that quickly fades. 17-Aug-2004 20:06 W Ragged front becomes discernible, developing slightly toward WNW. It fades througout C3. 17-Aug-2004 20:06 SE Faint elongated and narrow front. It fades in C3. ------------------------------------------------------------------------------------- 18-Aug-2004 04:30 WNW Apparently, a ragged and not well defined front that quickly fade in the already existent gusty outflow. 18-Aug-2004 11:06 WNW Faint small ragged front that quickly fades. 18-Aug-2004 11:54 SE Small ragged front that fades throughout C3. Very faint extendsions above the E Limb. 18-Aug-2004 16:54 E Elongated and ragged loop front followed at 18:30 UT by a bright (wider and faster) ragged loop front and trailing material. The first front is surpassed by this second feature in the C3 FOV. By 18:30 UT extremely faint extensions seem to cover the C2 occultor (especially to N). EIT Fe XII running difference images show a CME from nearby what later would be NOAA AR 10662 (nearby N12E28) between ~ 18:12 - 18:48 UT, exhibiting a dimming and an apparent wave to E of the AR. 18-Aug-2004 17:54 WSW Very bright and wide loop front with structured interior and trailing material. It is preceded, a little bit to S, by a very faint and diffuse front (1), which is quickly surpassed by the 'big' event. Note that GOES recorded multiple C-class X-ray activity from NOOA AR 10656 all along the day. In particular, an X1.8 X-ray occurred on that region (by the time at S13W88) between 17:29 - 17:54 UT with peak emission at 17:40 UT, which was clearly associated with the big CME event as depicted in EIT Fe XII running difference images. They show a strong brightening right on the W Limb above the AR mentioned above peaking at 17:36 UT followed by the blow-out of pre-existing structures. Prior to that, starting at around 16:24 - 16:36 UT a CME signature is seen coming out from apparently right behind the WSW limb, likely the EIT counterpart of (1). In particular, a C7.2 X-ray flare was recorded on S12W88 between 16:21 - 17:01 UT with peak emission at 16:46 UT. 18-Aug-2004 19:31 SE Slow diffuse loop front with structured interior develops toward ESE. It fades throughout C3. ------------------------------------------------------------------------------------- *** On 19-Aug-2004 there is a system of 'continuous' expanding loops above *** *** the SW Limb, and infalling material above the W Limb, all along the day. *** 19-Aug-2004 01:31 W Very faint front becomes discernible at around 2 solar radii above the limb (Kind-of 'reconexion' event). 19-Aug-2004 02:54 E Narrow and ragged loop front that fades throughout C3. 19-Aug-2004 04:30 E Faint loop (initially asymmetric) front begins to be discernible. It develops slightly toward ESE, and fades throughout C3. Difficult to give an exact time of first appearance. 19-Aug-2004 10:54 E Narrow and diffuse loop front. Blob-like feature a little bit to N and developing slightly toward ENE. 19-Aug-2004 17:54 E Extremely faint and not well defined front. Barely visible in C3. 19-Aug-2004 18:30 NW Faint spray-like front that fades throughout C2. ------------------------------------------------------------------------------------- *** On 20-Aug-2004 both the infalling material and the 'continuous' *** *** expanding loops system continue. *** 20-Aug-2004 06:30 ENE Diffuse loop front with faint extensions to N, followed by another loop front at 06:54 UT. By 08:30 UT a very faint and not well defined front follows above the E Limb. 20-Aug-2004 13:31 NE Jet-like front , immediately followed just to S, by a narrow and elongated loop front. They both fade throughout C3. 20-Aug-2004 15:30 NE Faint and diffuse loop front, followed at 15:54 UT on ENE by a bright ragged loop front. The diffuse front develops mainly toward NE while the bright loop becomes asymmetric and develops mainly toward ENE. They both fade throughout C3. ------------------------------------------------------------------------------------- 21-Aug-2004 01:54 SW Small front (blob-like) becomes visible. Difficult to give an exact time of first appearance. It fades throughout C3. **** LASCO-C2 Data Gap between 02:30 - 03:54 UT **** 21-Aug-2004 05:54 NNW Extremely faint and diffuse elongated loop front. Another ones at 08:30, 10:56, and 12:54 UT. 21-Aug-2004 14:54 E Faint and not well defined ragged front. Several similar fronts during the rest of the day. 21-Aug-2004 07:31 W Ragged loop front that quickly fades. 21-Aug-2004 23:06 W Ragged transequatorial loop front. By 02:30 UT on next day, a similar (though narrower) front becomes visible above the WSW Limb. They both fade througout C3. An infalling feature is seen at ~ 07:31 UT (next day) on WSW. ------------------------------------------------------------------------------------- 22-Aug-2004 05:54 E Ragged front that fades close to the inner edge of C3. 22-Aug-2004 09:54 W Ragged loop front that quickly fades. 22-Aug-2004 17:06 E Another ragged front. It fades throughout C2. A brighter and very narrow feature can be distinguished to N during its development. ------------------------------------------------------------------------------------- 23-Aug-2004 00:30 E Bright and elongated loop front, followed a little bit to S (at 00:54 UT) by a ragged and diffuse loop front that fades throughout C2. The elongated front fades throughout C3. 23-Aug-2004 11:30 NW Diffuse front along streamer that quickly fade. The very slow development of an apparent system of loops along the streamer can be discerned by the time. 23-Aug-2004 21:54 NW Faint, diffuse, and not well defined front develops superposed in the LOS with the streamer and the apparent system of loops. Difficult to give an exact time of first appearance. ------------------------------------------------------------------------------------- 24-Aug-2004 02:30 NE Faint elongated loop front followed at 04:30, a little bit to N, by a similar one. They both fade close to the inner edge of C3. 24-Aug-2004 13:54 E Bright ragged loop front with faint extensions to N. Twisted trailing material. At 16:54 UT, a fainter ragged front becomes discernible in the trailing material. By the time, and a little bit to N of it, a bright and small front develops. By 18:06 UT, a kind of reconexion event occurs at about 2.8 solar radii (PA ~ 80), apparently involving the small front (material is seen faliing down). 24-Aug-2004 15:30 SW Very faint spray-like front, followed by another one, a little bit to N, at 16:54 UT. 24-Aug-2004 21:30 W Very faint and diffuse front precedes a brighter small ragged front at 21:54 UT and a ragged loop front at 22:06 UT. The diffuse front can be seen to extend up to the S Pole during the development of the event. The whole event fades throughout C3. ------------------------------------------------------------------------------------- 25-Aug-2004 03:30 NW An extremely faint ragged loop front becomes discernible. Difficult to give an exact time of first appearance. 25-Aug-2004 12:54 ESE Very faint loop developing very slowly. By 20:37 UT Partial the loop front can be clearly seen extending all Halo above the S Pole, though much fainter there. The event is first clearly seen in C3 at about 21:36 UT, after an almost 3 hours C3 data gap due to the EIT Shuterless run between 19:00 - 21:40 UT. The front spans approximately 170 from PA ~ 075 - 245 at 02:18 UT on next day. By ~ 07:42 UT (on next day) is practically longer visible, without having reached the end of C3 FOV. The mean plane-of-sky speed for the LE of the loop front at PA ~115 was ~200 km/sec (based only on C3 data). Please note (*) that by 17:55 UT a faint ragged and elongated loop front can be guessed above the E Limb on C2, followed by the development of a system of faint and wide loop fronts that seems to affect the development of the front previously mentioned. EIT Fe XII images do not show any visible signature associated to the event on the disk. Likewise, GOES did not record any significant X-ray activity by the time that could be associated to the event. The event has therefore been determined as a faint 'partial' halo CME, most likely backsided. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/260.html 25-Aug-2004 14:54 WSW Very faint elongated loop front that fades in C2. It is followed, a little bit to N at 15:30 UT by a small ragged front that quickly fades. 25-Aug-2004 17:55 E Faint ragged and elongated loop front becomes discernible [see (*) in previous event]. 25-Aug-2004 18:28 W Bright and elongated loop front developing slightly toward WSW. It fades throughout C3. **** Only ~ 1 LASCO C2 image per hour, no LASCO C3 images **** **** between 19:00 - 21:40 UT due to EIT Shutterless Campaign **** **** EIT CME watch resumed at 21:40 UT on 25-Aug-2004. **** ------------------------------------------------------------------------------------- 26-Aug-2004 00:54 W Faint and diffuse loop front that quickly fades. 26-Aug-2004 01:54 SW Slow development of a system of faint loops. 26-Aug-2004 09:30 W Diffuse jet-like front developing slightly toward WSW. It fades throughout C2. 26-Aug-2004 10:30 SSW Diffuse front. Difficult to give an exact time of Partial first appearance due to the diffuseness of the Halo front. The event later develops as a system of wide loop fronts clearly discerned since 12:54 UT. By 18:06 UT, when the front almost reached the outer edge of C2, the event already extended over the S Pole. The event is first seen in C3 above the SW Limb at 16:42 UT. Several fronts can be discerned developing afterward. In particular, one that is first seen above the S Pole at 19:42 UT. By 00:18 UT on next day the whole event spans ~ 130 deg from PA ~ 140 - 270. By ~ 05:42 UT (on next day) the event is practically no longer visible, apparently without having reached the end of C3 FOV. The mean plane-of- sky speed for the LE of the outermost loop front at PA ~ 207 was ~ 245 km/sec (based only on C3 data) showing a slight acceleration. This event apparently disturbs the evolution of the event reported to start at 01:54 UT, as inferred from C2 images. However, it is not seen to be surpassed by our event (in C3). EIT Fe XII images show signatures of a CME event (filament lift-off) between 11:00 - 15:24 UT nearby NOAA AR 10664 (mainly to the SE of it). The ejection is seen to develop toward SW. On the other hand, GOES did not record any significant X-ray activity by the time that could be associated to the event. The event has therefore been determined as a 'partial' halo CME, frontsided. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/261.html 26-Aug-2004 13:31 NW Faint spray-like front preceding a ragged loop front at 16:30 UT. 26-Aug-2004 18:30 W Small ragged front that fades throughout C2. 26-Aug-2004 20:58 E Very faint expanding loop front becomes discernible. Another one develops within. The latter apparently surpasses the first one close to the inner edge of C3. Difficult to give an exact time of first appearance. ------------------------------------------------------------------------------------- 27-Aug-2004 01:54 SE Extremely narrow and elongated expanding loop front at the PA of the southern leg of event reported to start at 20:58 UT on previous day. 27-Aug-2004 09:06 W Bright loop front, cavity and twisted inner core. Typical 3-part structure CME. Gusty outflow and gusty infalling material well into next day. 27-Aug-2004 10:30 E Faint assymetric front becomes discernible. It develops toward ENE. 27-Aug-2004 13:54 SE Very faint front develops as an elongated loop. By 17:30 UT, a little bit to N, another front becomes discernible. And by 18:30 UT, still a little bit to N, a front smilar to the first one starts developing at about 2 solar radii. Infalling material afterward. They all fade throughout C3. 27-Aug-2004 23:30 ENE Very faint small front develops as a ragged loop front that fades close to the inner edge of C3. ------------------------------------------------------------------------------------- **** LASCO-C2 Data Gap on 28-Aug-2004 between 02:30 - 03:54 UT **** 28-Aug-2004 12:06 W Faint fan-like front. It fades throughout C2. 28-Aug-2004 20:58 NE Very faint ragged front that quickly fades. ------------------------------------------------------------------------------------- 29-Aug-2004 02:30 W Bright ragged loop front followed at 03:54 UT by a faint loop front that quickly fades. Bt that time, just behind the bright front, a narrower ragged loop-like structure can be discerned (already close to the outer edge of the C2 FOV). They both fade throughout C3. 29-Aug-2004 04:30 SE Very faint jet-like front, apparently followed by extremely faint expanding curved structures that develop toward the S Pole. 29-Aug-2004 13:31 SE Another jet-like front that quickly fades. Afterward (difficult to give an exact time of first appear- ance), again a system of extremely faint expanding curved structures develop toward the S Pole. They are barely visible in C3. ------------------------------------------------------------------------------------- 30-Aug-2004 03:54 W Ragged loop front that fades close to the inner edge of the C3 FOV. By 05:54 UT another ragged loop front follows. By 07:31 UT, a narrow and faster loop front follows to N. Another (fainter) ragged front at 09:06 UT (it quickly fades). Gusty emission follows. GOES recorded a C2.4 X-ray flare from NOAA AR 10663 (N06W66) between 03:04 - 03:18 UT with peak emission at 03:11 UT. And several B-class flares from the same active region between 09:54 - 15:04 UT (peak emissions at 10:00, 14:03, 14:52, and 15:02 UT). 30-Aug-2004 16:54 W Another ragged loop front that fades throughout C3. Event most likely related to activity on NOAA AR 10663. **** LASCO-C2 Data Gap on 30-Aug-2004 between 18:06 - 19:55 UT **** 30-Aug-2004 20:54 W Another ragged loop front followed at 21:54 and 23:30 UT by a couple of similar ragged fronts. They all fade throughout C3. Events most likely associated to activity on NOAA AR 10663. Please also note that GOES recorded a C1.0 X-ray flare from NOAA AR 10663 (N04W78) between 18:06 - 18:29 UT with peak emission at 18:18 UT (possible C2 event associated to the X-ray event likely missed in the data gap). 30-Aug-2004 23:06 NNE Very faint and diffuse asymmetric front. Barely visible in C3. ------------------------------------------------------------------------------------- 31-Aug-2004 01:31 W Another ragged loop front. GOES recorded a B9.3 X-ray flare from NOAA AR 10663 (N03W83) between 00:40 - 00:52 UT with peak emission at 00:46 UT. 31-Aug-2004 05:54 W Bright loop front with structured interior. GOES recorded an M1.4 X-ray flare from NOAA AR 10663 (N06W82) between 05:24 - 05:47 UT with peak emission at 05:38 UT. 31-Aug-2004 06:30 W Just behind the bright loop front reported to start at 05:54 UT, a slow twisted structure develops (flux-rope type event). Difficult to give an exact time of first appearance. 31-Aug-2004 06:54 SE Faint and diffuse spray front. It fades throughout C3. 31-Aug-2004 14:54 W Faint ragged front that fades throughout C2. It is superposed in the LOS with event at 06:30 UT. GOES recorded a B5.5 X-ray flare from NOAA AR 10663 (N03W90) between 14:07 - 14:20 UT with peak emission at 14:15 UT. 31-Aug-2004 20:06 NE Vary faint loop front. It fades throughout C2. ===================================================================================== 01-Sep-2004: ************ 02:30 ESE - Ragged loop front. It fades close to the inner edge of C3 FOV. 03:30 ENE - Very faint ragged and diffuse front that quickly fades. It is followed at 06:54 UT by a similar front above the E Limb that also quickly fades. 03:30 W - Ragged elongated loop front with fain loop-like extensions to S. It is preceded at 01:54 UT by a faint kind-of spray-like front. 06:30 E - Another very faint and ragged front that quickly fades. 12:55 N - Extremely faint and diffuse front. Difficult to give an exact time of first appearance. Its development seems to be affected by event at 15:38 UT. **** Only ~ 1 LASCO C2 image per hour, no LASCO C3 images **** **** between 14:00 - 16:40 UT due to EIT Shutterless Campaign **** **** EIT CME watch resumed at 16:40 UT on 01-Sep-2004. **** 15:38 WSW - Complex event that developed as a very asymmetric full halo CME. (HALO) The event was first observed in C2 at about 15:38 UT above the WSW Limb as, apparently, two loop fronts embedded in a diffuse structure. By 17:30 UT the event developed as a very asymmetric full halo CME in C2; the leading edge in the SW direction having already left the C2 FOV, while in the E direction the front is barely above the C2 occultor. The event was first seen in C3 at 16:38 UT above the WSW Limb. Please note that by that time a feature brighter to N starts developing toward ENE in the C3 FOV, and seems to give a different appearance to our event. By ~ 00:18 UT on next day the event is practically no longer visible, apparently without having reached the end of the C3 FOV. The mean plane-of-sky speed for the LE of the outermost loop front at PA ~ 245 was ~ 442 km/sec. On the other hand, the inner front showed a plane-of- sky speed of about 400 km/sec at PA ~ 250 (in both cases based only on C3 data). GOES did not record any significant X-ray activity by the time. Likewise, the available EIT Fe XII images do not show any signature on the visible disk. Please note that by that time EIT was performing the Run #2 of the Shutterless Campaign. Inspection of the EIT movie made with the images of the Shutterless sequence do not show anything (in the restricted FOV) that could be related to our event. The event has therefore been determined as an asymmetric 'full' halo CME, most probably backsided. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/262.html 23:06 WNW - Elongated and diffuse loop front. ------------------------------------------------------------------------------------- 02-Sep-2004: ************ 01:31 W - Blob-like front becomes discernible. 09:30 WNW - Diffuse and elongated ragged loop front. 14:54 W Small ragged front developing slightly toward WSW. It fades throughout C2. 17:06 N - Extremely faint front It fades throughot C2. 17:30 WSW - System of elongated ragged loop fronts. ------------------------------------------------------------------------------------- 03-Sep-2004: ************ 00:30 NW - Extremely faint and diffuse front surrounding almost the C2 occultor. SEE description of event reported to start at 00:40 UT. 00:30 WSW - Bright ragged feature. SEE description of event reported to start at 00:40 UT. 00:54 SE - Almost circular front develops as a 'full' halo CME. The 'halo' (HALO) event (hereafter Event #1) was first observed in C2 above the SE Limb extending up to the SW Limb. Please note that already by 00:30 UT an extremely faint and diffuse front is also seen surrounding almost completely the C2 occultor. Closer inspection of the development of this faint front shows that what at first glance seemed only one front are in fact two: one moving out mainly toward NW (Event #2), and another one developing mainly toward SE (Event #3). Starting also at 00:30 UT a ragged feature (brighter than the other features described above) develops toward WSW - SW (Event #4), which is followed at 03:06 by a twisted feature. Also at that time, an elongated ragged feature can be seen developing toward NE (Event #5).The five events are first seen in C3 by 01:42 UT: Event #1 just barely seen above the SW Limb, Event #2 (on NW) and #3 (on SE) further out, Event #4 above the WSW Limb as a bright ragged feature, and Event #5 just above the NE Limb. For reference, the mean plane-of-sky speed for the LE of the different events is shown below (based on C3 data): Event #1: PA 128 --> 412 km/sec (practically no acceleration) Event #2: PA 291 --> 484 km/sec (very diffuse LE) Event #3: PA 086 --> 599 km/sec (very diffuse LE) Event #4: PA 241 --> 388 km/sec (practically no acceleration) Event #5: too difficult to track it accurately, but its speed is in the 350-450 km/sec range. GOES did not record any significant X-ray activity by the time. On the other hand, EIT Fe XII images show the lift-off of a filament located around equatorial latitudes, past half way to the W Limb, starting at around 18:00 UT. This signature is likely to be the EIT counterpart of either what we called Event #4 or the twisted feature coming behind. Other than that, there is no other visible signature on the disk that could be related to the other events mentioned above. It is not clear whether Events #2 and #3 are related to any of the other two events or are monsters of a diferent nature. As for Event #1, it has therefore been determined as a 'full' HALO CME, backsided. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/263.html 10:30 HALO - Very faint and diffuse circular front in the northern hemisphere, brighter above the ENE Limb. By 10:54 UT the C2 occultor is completely surrounded. By that time, a brighter front begins to be visible above the E Limb up to the S Pole. Inspection of the C2 running difference movie shows an almost perfect circular front inside the diffuse circular front described at the beginning. The C3 occultor is completely surrounded by this second feature at 11:42 UT. For reference, the mean plane-of-sky speed for the LE of the various features is given below (based on C3 data): . LE of the diffuse circular front at PA 120: 692 km/sec (practically no acceleration) . LE of the second circular front at PA 115: 517 km/sec (practically no acceleration) GOES did not record any significant X-ray activity by the time. Likewise, EIT Fe XII images do not show any signature that could be related to the Halo event. The event has therefore been determined as a 'full' halo CME, backsided. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/264.html 18:30 WSW - Faint ragged loop front that fades throughout C3. 19:31 WNW - Small and bright loop front followed by a diffuse front slightly to N moving apparently faster. They fade througout C3. 19:54 ENE - Very faint and not well defined front. It fades throughout C3. Gusty outflow before and after. ------------------------------------------------------------------------------------- 04-Sep-2004: ************ 02:06 W - Bright and elongated loop front. It fades throughout C3. 06:54 E - Bright loop front. By 07:31 UT a wide and bright loop front (HALO) can be seen developing mainly toward E accompanied by a much fainter and diffuse loop front extending all above the N Pole. By 08:06 UT the C2 occultor is completely covered (with very faint extensions above the SW Limb). Please note that by 08:30 UT, above the NE Limb, an apparently flat ragged front is discernible superposed in the LOS with our event. On the other hand, features corresponding to the halo event are first seen in C3 at 07:42 UT above the E - ESE Limb, exhibiting a diffuse front ahead of a bright loop front. The C3 occultor is covered by 08:42 UT. For reference, the mean plane-of-sky speed for the LE of various features is given below (based on C3 data): . LE of the diffuse front at PA 112: 970 km/sec . LE of the bright loop front at PA 112: 850 km/sec . LE of the outermost feature at PA 295: 457 km/sec GOES did not record any significant X-ray activity by the time. EIT Fe XII images show a CME signature that develops above the E Limb, starting at around 07:36 UT. Such an ejection seems to be rooted with one leg on the visible side and the other one behind the limb. It is most likely the EIT counterpart of the 'flat' front mentioned above. As for the halo event, there is no visible signature on the Earthside of the Sun as seen on EIT Fe XII images that could be associated. The event has therefore been determined as an asymmetric 'full' halo CME, backsided. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/265.html 09:54 E - Very ragged loop front. It fades throughout C3. Gusty outflow. Infalling material on SE along the rest of the day. 18:30 W - Very faint spray-like front. ------------------------------------------------------------------------------------- 05-Sep-2004: ************ 05:30 E - Faint ragged loop front that fades close to the inner edge of C3. 06:30 NW - Big bright loop front. EIT Fe XII running difference images show CME signature from nearby N20W60 travelling toward NW starting at around 05:24 UT. Apparent dimming centered on source. 06:54 S - Very faint asymmetric loop front developing slowly. It fades throughout C3. 07:54 E - Wide and bright loop front with structured interior. It is followed at 12:54 UT by a small and relatively bright front. By 07:25 UT EIT Fe XII running difference images show an apparently backsided CME above the E Limb. No significant X-ray activity reported by GOES. 13:31 SSW - Diffuse jet-like front that quickly fades. 18:54 E - Another wide and bright loop front with structured interior. Starting at 18:24 UT EIT Fe XII running difference images show an apparently backsided CME above the E Limb. No significant X-ray activity reported by GOES. 20:30 W - Ragged front that fades close to the inner edge of C3. 20:58 E - Bright ragged loop front moving apparently faster than the one at 18:54 UT. Difficult to give an exact time of first appearance due to the superposition of events in the LOS. By 23:42 UT the first front is apparently surpassed in the C3 FOV by this second front. Close inspection of the C2-C3 sequence of images seems to reveal a third front (even more explosive) starting also at around 20:58 UT and developing slightly toward ESE. By 00:18 UT a faint halo seems to develop in C3. Nothing significant in Fe XII running difference images on the disk. Most likely, the source for the likely 3 events (if not 4) was in the backside, as for the event at 18:54 UT. Likewise, no significant X-ray activity was reported by GOES by the time. Gusty outflow well into next day. ------------------------------------------------------------------------------------- 06-Sep-2004: ************ 05:54 ESE - Ragged loop front. It is preceded by several other ragged fronts on E -e.g., at 03:30 UT- and ESE -e.g., at 02:30 UT-, and also afterward -e.g., at 10:30 UT- (intermitent activity). 16:30 SE - Slow development of a system of asymmetric loops that spans later all above the S Pole. Continuous development of loops well into the first half half of next day. As time goes by, the main direction of the flow seems to rotate toward W, like following the Sun's rotation. Activity most likely associated with the 'cluster' of active regions 10667, 10669, and 10670. In particular, GOES recorded a B8.2 X-ray flare form NOAA AR 10667 (S14E19) between 15:30 - 15:49 UT with peak emission at 15:39 UT. ------------------------------------------------------------------------------------- 07-Sep-2004: ************ 08:30 W - Small and very faint loop front that quickly fades. EIT Fe XII running difference images show an 'apparently' barely backsided starting at around 07:36 UT above the W Limb. GOES recorded a C1.1 X-ray flare from NOAA AR 10668 (S08W88) between 07:06 - 08:03 UT with peak emission at 07:38 UT. 15:30 E - Bright and wide loop front with structured interior and trailing material and much gusty outflow well into next day. By 16:54 UT an apparent different structure seems to develop inside the previos CME and spanning up to above the S Pole. The development of two different structures is clearer in C3. EIT Fe XII running difference images show a big and barely backsided CME above the E Limb starting at around 14:00 UT. Please also note that between 15:24 - 16:12 UT an intensity disturbance is seen travelling all above the SE Limb (maybe related to the second feature seen in C2 FOV?). GOES recorded a long duration X-ray event, i.e., a C2.8 X-ray flare from N03E85 between 13:40 - 16:43 UT with peak emission at 15:29 UT. 17:30 W - Very faint asymmetric front that fades close to the iner edge of C3. 18:54 SW - Diffuse and wide loop front. Continuos development of a system of loop fronts into next day. EIT Fe XII running difference images show a faint CME signature from nearby NOAA AR 10671 starting at around 18:12 UT. Post-event loops develop afterward. ------------------------------------------------------------------------------------- 08-Sep-2004: ************ 0:06 E Gusty outflow continues. Several small ragged fronts along the day can be discerned (e.g.,: ~ 02:06, 04:06, 05:30, 07:31, 10:30, and 16:30 UT). GOES recorded a C1.5 X-ray flare from N05E85 between 00:59 - 01:26 UT with peak emission at 01:10 UT. 02:30 NE - Ragged and elongated loop front that fades throughout C3. 02:30 SW - Superposed in the LOS with event reported to start at 18:54 UT on previous day, a faint ragged front develops moving apparently faster. More similar fronts afterward. 04:30 S - Faint and elongated front. Gusty outflow toward S, rotating with the Sun toward W. GOES recorded a B9.0 X-ray flare from NOAA AR 10669 (S05E02) between 03:41 - 03:57 UT with peak emission at 03:49 UT. 12:30 WSW - Not well defined faint and diffuse front becomes discernible. **** LASCO data gap from 14:00 to 15:30 UT due to ICAL01 **** **** (intercalibration for EIT with CDS). **** 18:54 SE - Diffuse elongated loop front that quickly fades. 19:31 E - Initially bright elongated loop front (slightly developing toward ESE) preceded at 18:54 UT (a little bit to N) by a narrow ragged front. They fade throughout C3. 23:06 E - Spray-like front developing slightly toward ESE. ------------------------------------------------------------------------------------- 09-Sep-2004: ************ 01:54 E - Narrow and asymmetric expanding loop front. 02:54 SW - Faint elongated and ragged loop front. It fades throughout C3. Infalling material to N. 06:06 E - Bright and wide loop front, cavity, and inner core. Trailing material. Some small ragged fronts in the trailing material, e.g. at 14:06, 15:54, 19:31, 20:06, and 21:30 UT. The loop front is preceded by a narrow and asymmetric front at around 05:06 UT. EIT Fe XII running difference images show signatures of a CME, barely backsided, above the E Limb starting at ~ 04:48 UT. Post event loops can be seen afterward developing just above the E Limb. GOES recorded a C3.2 X-ray flare from NOAA AR 10672 (E Limb) between 04:50 - 06:40 UT with peak emission at 06:01 UT. 09:30 W - Slow development of a faint system of asymmetric loop fronts. Difficult to give an exact time of first appearance. 14:06 WSW - Elongated and asymmetric loop front at roughly the southern leg (on the inner side) of event reported to start at 09:30 UT, moving apparently faster. It develops mainly toward W. 14:30 WNW - Elongated loop front at roughly the northern leg (on the inner side) of event reported to start at 09:30 UT. 18:06 WSW - Faint asymmetric loop front. GOES recorded a B9.3 X-ray flare from NOAA AR 10671 (S11W68) between 17:55 - 18:13 UT with peak emission at 18:00 UT. ------------------------------------------------------------------------------------- 10-Sep-2004: ************ 00:30 E - Faint, ragged, and not well defined front. GOES recorded a C1.0 X-ray flare from NOAA AR 10672 between 21:59 - 22:26 UT with peak emission at 22:16 UT (on 2004/09/09). 08:06 WSW - Faint (initially asymmetric) loop front. It fades throughout C3. 09:30 E - Couple of faint fronts in the gusty outflow, most likely related to activity on NOAA AR 10672. 20:34 E - Initially bright ragged front. GOES recorded a C1.7 X-ray flare from NOAA AR 10672 (N01E59) between 18:56 - 20:15 UT with peak emission at 19:41 UT. 21:49 W - Ragged loop front followed. It fades throughout C3. **** No EIT data 2004/09/10 (20:00 UT) - 2004/10/03 (~22:00 UT). **** **** (EIT in CCD bakeout mode). **** ------------------------------------------------------------------------------------- 11-Sep-2004: ************ **** Only partial LASCO data between 2004/09/11 - 2004/10/06 **** **** due to intermittent contact during telemetry keyhole. **** **** Most likely some events missed. **** 03:36 W - Faint ragged loop front already under development. Start missed due to degrades data. It fades throughout C3. 04:54 W - Small and faint ragged loop front developing slightly toward WSW. 05:12 E - Elongated and ragged faint loop front with apparently twisted trailing material. 08:12 W - Another couple of faint loop fronts becomes discernible. **** LASCO C2 Data Gap on 2004/09/11 between 12:00 - 18:00 UT due to **** **** LASCO cooperation with UVCS and Mars Express in Faraday Rotation **** **** Measurements (#7079) program. During that time, C3 full field images **** **** pB sequence (512x512) at 17 minutes cadence. **** ------------------------------------------------------------------------------------- 12-Sep-2004: -KEYHOLE- ************ 00:36 E - Bright loop front that develops as an off-centered halo CME. A strong cavity and inner core can be well distinguished by 01:24 UT. At that time the LE on E is already above the end of C2 FOV, and fainter loop-like extensions already cover the C2 occultor, spanning from the N to the S Pole, all above the W Limb. Much trailing material follows on E. The event is first seen on C3 at 01:18 UT above the E Limb. By 02:18 UT the C3 occultor is completely covered, the LE on the E Limb being at ~ 13 solar radii, while on W the LE is only at above 5.5 solar radii from disk center. For reference, the mean plane-of-sky speed for the LE of the outermost feature at various PA is given below (based on C3 data): . PA 044 : 1150 km/sec . PA 086 : 1262 km/sec . PA 140 : 1326 km/sec . PA 221 : 787 km/sec . PA 296 : 470 km/sec GOES recorded an M4.8 X-ray flare from the NOAA AR 10672 (N03E49) between 00:04 - 01:33 UT with peak emission at 00:56 UT. Please note that SOHO entered a telemetry keyhole on 2004/09/11 that will last until 2004/10/06. Between 2004/09/10 @ 22:00 UT - 2004/10/03 @ 22:00 UT EIT will be performing the CCD bakeout and therefore no EIT images will be available during that period. The event has therefore been determined as an off-centered 'full' halo CME, most frontsided in spite of the temporal correlation observed with the X-ray event. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/266.html 02:54 E - In the trailing material of previous event, a small and bright front can be discerned. It fades throughout C3. 12:12 WSW - Very elongated loop front. **** LASCO C2 Data Gap (for CME watch) on 2004/09/12 between 16:40 - 17:40 **** **** UT due to LASCO cooperation with UVCS and Mars Express in Faraday **** **** Rotation Measurements (#7079) program. During that time, C2 subfield **** **** (26x16 block) in NE at 8.3 minutes cadence. **** 18:48 W - Couple of faint loop fronts, one developing toward W (fades in C3) and the other one (discernible a little bit later) slightly toward WNW (fades in C2). 20:12 NE - Faint ragged loop front that fades throughout C2. It is followed at 22:54 UT by a kind-of faint half loop front. ------------------------------------------------------------------------------------- 13-Sep-2004: -KEYHOLE- ************ 02:48 NE - Ragged expanding front. It fades throughout C3. 07:36 ESE - Slow development of a ragged system of loops. Difficult to give an exact time of first appearance. After the data gap, a trailing twisted structure is seen under development. GOES recorded a C1.4 X-ray flare from NOAA AR 10672 (N03E31) between 13:34 - 13:42 UT with peak emission at 13:39 UT. **** LASCO C2 Data Gap (for CME watch) on 2004/09/13 between 11:50 - 17:50 **** **** UT due to LASCO cooperation with UVCS and Mars Express in Faraday **** **** Rotation Measurements (#7079) program. During that time, C2 subfield **** **** (26x16 block) in NE at 8.3 minutes cadence. **** 20:24 W - Ragged loop front followed at 22:24 and 23:12 by a couple of faint ragged fronts. They seem to fade throughout C2. A curved feature expands just to N of the first front. Proton storm. GOES recorded another C1.4 X-ray flare from NOAA AR 10672 (N07E26) between 20:07 - 20:14 UT with peak emission at 20:11 UT. ------------------------------------------------------------------------------------- 14-Sep-2004: -KEYHOLE- ************ 01:24 E - Ragged loop front developing slightly toward ESE. It is followed at 03:12 UT by a loop front a little bit to S. An apparently twisted feature with an initially bright top follows (04:36 UT) at roughly the PA of the second loop, and slightly expanding toward SE. 08:24 E - Faint and not well defined loop front. Its development seems to be affected by the event at 10:12 UT. 10:12 SE - Initially bright ragged loop front preceded by a much fainter and diffuse ragged front. An apparently different front seems to develop toward SSE. By 11:12 UT, an extremely faint loop front develops toward E, partly superposed in the LOS with the trailing material of the first front mentioned. Starting at 11:18 UT, C3 shows a ragged loop front developing toward SE, and another (fainter) loop front developing toward SSE a little bit farther out. Further development missed by the following data gap. GOES recorded an M1.5 X-ray flare from NOAA AR 10672 (N03E16) between 07:47 - 10:00 UT with peak emission at 09:30 UT. 10:48 NNW - Ragged and diffuse loop front. **** LASCO C2 Data Gap (for CME watch) on 2004/09/14 between 14:10 - 17:35 **** **** UT due to LASCO cooperation with UVCS and Mars Express in Faraday **** **** Rotation Measurements (#7079) program. During that time, C2 subfield **** **** (26x16 block) in NE at 8.3 minutes cadence. **** 18:24 SE - Small and faint ragged front already under development. It fades throughout C3. 21:36 SE - Slow development of a blob-like feature that fades throughout C3. Difficult to give an exact time of first appearance. ------------------------------------------------------------------------------------- 15-Sep-2004: -KEYHOLE- ************ 01:36 SE - Ragged and not well defined faint loop front that fades throughout C3. 02:12 E - Very faint loop front. It fades throughout C2. 08:12 E - Another very faint loop front slowly developing. 09:12 SE - Faint and elongated diffuse loop front. It fades throughout C3. A ragged asymmetric front follows at 19:12 UT. 14:12 WNW - Faint ragged front that quickly fades. 19:36 W - Diffuse loop front that quickly fades followed at 20:57 UT by another one that also quickly fades. ------------------------------------------------------------------------------------- 16-Sep-2004: -KEYHOLE- ************ 03:12 SSE - Extremely faint ragged front. It fades throughout C3. 03:36 NE - Faint elongated expanding loop front that fades throughout C3. **** LASCO Data Gap on 2004/09/16 between 10:12 - 13:24 UT. **** 13:36 SE - Slow expansion of a system of loops already under development after data gap. At 15:36 UT a faint and diffuse loop front seems to develop superposed in the LOS, apparently moving faster. Another one at 21:24 UT. Continuos development of faint expanding loop fronts into next day, all along the day. 16:12 NE - Expanding fan-like front. ------------------------------------------------------------------------------------- 17-Sep-2004: -KEYHOLE- ************ 00:12 S - Extremely faint ragged front. Barely discernible in C3. **** LASCO Data Gap on 2004/09/17 between 11:12 - 18:24 UT. **** 20:36 E - Faint and diffuse front. ------------------------------------------------------------------------------------- 18-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/18 between 00:24 - 07:36 UT. **** **** LASCO Data Gap on 2004/09/18 between 08:54 - 16:48 UT. **** 20:12 NE - Very faint blob-like front. Difficult to give an exact time of first appearance. It fades throughout C3. 23:12 W - Very faint blob-like front developing slightly toward WSW. Difficult to give an exact time of first appearance. ------------------------------------------------------------------------------------- 19-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/19 between 00:24 - 07:24 UT. **** **** LASCO Data Gap on 2004/09/19 between 14:36 - 22:24 UT. **** 22:24 W - Big CME under development after data gap (LE already out of C2 FOV). Proton storm. ------------------------------------------------------------------------------------- 20-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/20 between 00:00 - 07:36 UT. **** 12:12 W - Blob-like front developing toward W. Gusty outflow in what seems to be the trailing part of event reported to start at 22:24 UT on previous day. 12:12 WSW - Blob-like front developing toward WSW. **** NO LASCO Data between 2004/09/20 (14:0 UT) and **** **** 2004/09/22 (~22:00 UT) due to SOHO S/C maneuvers, **** **** and 180 deg Roll on 2004/09/21. **** ------------------------------------------------------------------------------------- 22-Sep-2004: -KEYHOLE- ************ **** LASCO resumes operation on 2004/09/22 at ~ 22:00 UT **** **** after S/C maneuvers on 2004/09/21. **** 23:08 N - Faint and diffuse 'helmet-like' loop front. ------------------------------------------------------------------------------------- 23-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/23 between 00:00 - 07:36 UT. **** 08:54 W - Faint and diffuse loop front. **** LASCO Data Gap on 2004/09/23 between 09:24 - 13:24 UT. **** 13:24 SE - Ragged 'blob-like' front already after development after data gap. 13:24 WSW - Thin, elongated and ragged loop-like feature already under development. 14:54 WSW - Elongated spray-like front. **** LASCO Data Gap on 2004/09/23 between 16:24 - 21:36 UT. **** ------------------------------------------------------------------------------------- 24-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/24 between 00:00 - 02:48 UT. **** 03:12 SE - Small blob-like front already under development. **** LASCO Data Gap on 2004/09/24 between 04:24 - 15:12 UT. **** 15:24 NW - Trailing material of a prior event missed in the data gap. **** LASCO Data Gap on 2004/09/24 between 16:24 - 21:12 UT. **** 21:24 SW - Apparently trailing material of a prior event missed in the data gap. ------------------------------------------------------------------------------------- 25-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/25 between 00:00 - 07:36 UT. **** 07:36 W - Ragged loop front already under development after data gap. It is followed at 08:36UT by a smaller ragged front at roughly the PA of its southern leg. **** LASCO Data Gap on 2004/09/25 between 12:12 - 14:48 UT. **** 14:48 W - Wide ragged loop front already under development after data gap. Close inspection show that, apparently, a different front is developing in parallel toward WNW giving the appearance of a wide event (though it is difficult to be certain). Development of a system of loops afterward, slightly toward WNW. ------------------------------------------------------------------------------------- 26-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/26 between 00:00 - 07:36 UT. **** 08:24 WSW - Ragged front. Because of the data gap, it is difficult to say whether it's a different event or part of the trailing material of event reported to start at 14:48 UT on previous day. **** LASCO Data Gap on 2004/09/26 between 14:54 - 21:36 UT. **** ------------------------------------------------------------------------------------- 27-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/27 between 00:00 - 08:24 UT. **** **** LASCO Data Gap on 2004/09/27 between 12:12 - 14:48 UT. **** ------------------------------------------------------------------------------------- 28-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/28 between 00:00 - 05:24 UT. **** **** LASCO Data Gap on 2004/09/28 between 06:36 - 12:36 UT. **** 15:12 W - Wide loop front. Development missed in C2 due to data gap. Development of a system of wide and faint loops after data gap. **** LASCO Data Gap on 2004/09/28 between 15:24 - 20:36 UT. **** ------------------------------------------------------------------------------------- 29-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/29 between 04:54 - 13:24 UT. **** 13:36 ENE - Small ragged front already under development. It fades in C2. **** LASCO Data Gap on 2004/09/29 between 16:12 - 20:24 UT. **** 20:24 WNW - Relatively big twisted structure already under development. 22:36 W - Ragged loop front superposed in the LOS with previous event, developing apparently faster. ------------------------------------------------------------------------------------- 30-Sep-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/09/30 between 00:12 - 08:54 UT. **** 10:12 ENE - Bright ragged structure already under development. 10:12 NW - Elongated (apparently) twisted structure already under development. **** LASCO Data Gap on 2004/09/30 between 10:54 - 21:24 UT. **** 22:12 W - Faint ragged front already under development after data gap. ===================================================================================== 01-Oct-2004: -KEYHOLE- ************ **** LASCO Data Gap on 2004/10/01 between 01:36 - 13:12 UT. **** 13:36 WSW - Ragged front already under development after data gap. ------------------------------------------------------------------------------------- 02-Oct-2004: -KEYHOLE- ************ 04:12 ENE - Diffuse front that quickly fades. 20:36 E - Slow loop front develops as a flux-rope type event (circular twisted structure and trailing material well into next day). It is preceded by a diffuse front on north, though it is difficult to give an exact time of first appearance due to its slow development. ------------------------------------------------------------------------------------- 03-Oct-2004: -KEYHOLE- ************ 14:00 SW - Ragged and diffuse loop front. It is accompanied by an elongated and relatively thin ragged front at roughly the PA of its northern leg. 17:12 ENE - Elongated spray-like front. Twisted trailing material. Some infalling material a little bit to S. **** LASCO Data Gap on 2004/10/03 between 21:36 - 24:00 UT. **** ------------------------------------------------------------------------------------- 04-Oct-2004: -KEYHOLE- ************ **** End of EIT CCD bakeout. **** **** EIT resumes Observation Program at ~ 00:00 UT. **** 13:54 E - Bright loop front developing slightly toward ESE. Trailing material. Some small loop fronts discernible in the trailing material. The event fades throughout C3. A bright an elongated structure develops in parallel slightly toward ENE, also fading throughout C3. Some small and very faint blob-like fronts prior to the event. 18:06 NE - Extremely faint elongated loop front. It fades in C2. ------------------------------------------------------------------------------------- 05-Oct-2004: -KEYHOLE- ************ 05:54 SW - Extremely faint thin loop that faint throughout C2. 14:30 NE - Faint and very thin expanding loop-like feature. 23:55 E - Initially bright loop front. It fades throughout C3. 23:55 W - Ragged loop front that fades throughout C3. Gusty outflow into next day. **** SOHO out of telemetry keyhole **** **** High rate telemetry fully recovered **** ------------------------------------------------------------------------------------- 06-Oct-2004: ************ 04:55 WNW - Ragged and apparently twisted feature. Difficult to give an exact time of first appearance. 04:55 NE - Very thin loop-like feature. It fades throughout C2. 12:00 NE - Faint loop front becomes discernible at about 3.2 solar radii ("pair formation": corresponding infalling feature starts to be seen by that time). Couple of similar (fainter) events afterward. 12:59 NE - Another very thin loop-like feature, almost jet-like, a little bit to S of event at 04:55 UT. It quickly fades. 16:58 W - Ragged front. A not-well-defined and faint front precedes it. 18:56 E - Bright ragged front and trailing material, well into next day. 20:43 NE - Another very thin loop-like feature, almost jet-like, at roughly the PA of event at 04:55 UT. It fades throughout C2. **** LASCO Data Gap between 22:06 - 02:34 UT (next day) due to **** **** C3 Filter Wheel hang at 22:22 UT. **** ------------------------------------------------------------------------------------- 07-Oct-2004: ************ 18:06 SW - Ragged and diffuse front preceding an expanding system of loops at ~ 20:06 UT. It continues well into next day. 22:06 WSW - Ragged front, smaller and faster than previous event. It fades throughout C2. Gusty emissions well into next day. ------------------------------------------------------------------------------------- 08-Oct-2004: ************ 03:06 WSW - Small loop front at roughly the PA of the northern leg of the expanding loop system. It is followed by another ragged loop front at ~ 05:54 UT. 11:57 WSW - Thin and elongated ragged loop front. 18:06 WSW - Bright and thin fan-like front. ------------------------------------------------------------------------------------- 09-Oct-2004: ************ 01:57 SW - Not well defined front already under development. Difficult to give an exact time of first appearance. 05:55 NE - Fan-like front that quickly fades. 18:06 ESE - Ragged front. It fades in C3. ------------------------------------------------------------------------------------- 10-Oct-2004: ************ 01:31 WSW - 'Pair formation', very faint. Difficult to give an exact time of first appearance. 02:06 NW - Faint loop front in the gusty outflow. 07:30 W - Small and narrow ragged loop front developing slightly toward WSW, and followed by a similar one at 08:54 UT. They fade throughout C2. 11:00 NW - Faint and diffuse loop front that quickly fades. Another one at 15:06 UT that also quickly fades. Slow development of a system of loops along the streamer superposed in the LOS. 12:54 W - Fan-like front that fades throughout C2. 21:54 NW - Ragged loop front. A more diffuse one on W. ------------------------------------------------------------------------------------- 11-Oct-2004: ************ 00:30 SE - Elongated and ragged loop front. 06:30 NW - Kind of explosive loop-like feature that fade throughout C2. 07:31 W - Very thin ragged loop front that fades throughout C2 is followed at 09:54 UT by a brighter ragged loop front that also fades in C2. By 12:30 UT, a bright spray-like loop front follows. 11:06 ESE - Ragged front. It fades throughout C2. **** LASCO Data Gap between 20:30 - 23:54 UT **** ------------------------------------------------------------------------------------- 12-Oct-2004: ************ 06:30 W - Ragged front developing slightly toward WNW. It fades throughout C2. 10:54 E - Small ragged front developing slightly toward ESE in the gusty outflow. It fades throughout C2. 12:06 W - Spray-like front. It fades throughout C3. ------------------------------------------------------------------------------------- 13-Oct-2004: ************ 00:30 N - Very faint and diffuse elongated front developing slightly toward ENE. 00:30 NW - Extremely faint elongated and ragged loop front. 03:54 NE - Ragged loop front followed at 11:06 UT by a jet-like front that quickly fades. 08:06 W - Thin spray-like front. It fades throughout C2. 11:06 NE - Faint jet-like front that quickly fades. 15:06 NW - Very faint elongated loop front. Difficult to give exact time of first appearance. 20:30 E - Very slow development of a twisted (rather cicular) structure. It is very difficult to give an exact time of first appearance due to its slow development. 21:55 NW - Kind of 'explosive' ragged front. Expanding loop-like structures following, well into next day. Bright elongated feature on S West (followed by a faint, diffuse, and apparently twisted elongated structure). Very faint halo extensions above the N Pole and Eastern hemisphere by 22:30 - 23:30 UT. The extensions fade throughout C2. Please note that GOES reported by the time a couple of X-ray flares on NOAA AR 0682 (not likely related to the event on NW): - a B2.2 X-ray flare (S17E61) between 21:08 - 21:17 UT with peak emission at 21:14 UT, and - a C1.0 X-ray flare (S16E63) between 21:20 - 22:20 UT with peak emission at 22:06 UT. ------------------------------------------------------------------------------------- 14-Oct-2004: ************ 00:30 ESE - Bright ragged loop front, most likely related two the 2 flares mentioned below. Some trailing material. Gusty outflow to N starting at about 04:06 UT. The event develops superposed in the LOS with the circular twisted structure reported at 20:30 UT (on previous day), moving much faster. By 06:54 UT, the circular structure is close to the end of C2 FOV. GOES reported a couple of X-ray flares on NOAA AR 0682 late on 2004/10/13: - a B2.2 X-ray flare (S17E61) between 21:08 - 21:17 UT with peak emission at 21:14 UT, and - a C1.0 X-ray flare (S16E63) between 21:20 - 22:20 UT with peak emission at 22:06 UT. Please also note the C1.7 X-ray flare reported by GOES from the same AR (S16E59) between 03:28 - 03:56 UT with peak emission at 03:49 UT. That AR produce also several X-ray B flares during the rest of the day. 14:30 ESE - Faint ragged loop front. 18:06 ENE - Elongated loop front immediately followed at 18:30 UT by a wider loop front extending up to N East. 18:54 NE - Very narrow (initially jet-like) and relatively bright loop front superposed in the LOS with previous event. 23:30 E - Elongated loop front developing toward ESE. ------------------------------------------------------------------------------------- 15-Oct-2004: ************ 00:30 NE - Narrow and faint loop front. It fades close to the inner edge of C3. 03:06 W - Small and diffuse loop front that quickly fades. 03:54 SSW - Relatively thick jet-like front that fades throughout C2. 06:54 NW - Fan-like front. It fades close to the inner edge of C3. 07:54 ESE - Ragged loop front with a ragged inner structure. It fades in C3. 15:54 W - Faint and diffuse ragged loop front that fades close to the inner edge of C3. 19:31 NNE - Very slow development of a diffuse expanding loop front followed by a system of faint expanding loops that span later all above the N Pole. It is difficult to give an exact time of first appearance. The development continues into next day. ------------------------------------------------------------------------------------- 16-Oct-2004: ************ 00:06 NW - Very slow development of a system of loops along the streamer. It is difficult to give an exact time of first appearance. 15:54 W - Ragged loop front partly superposed in the LOS with event at 00:06 UT on NW. 19:54 NW - A not well defined and difficult to discern faint front develops much faster than the slow system of loops apparently affecting its development. By ~ 06:06 UT on next day an apparent (also not well discerned) front seems to strongly affect the expansion rate of the slow loop system. 21:30 NE - Elongated loop front moving apparently faster than the event reported to start at 19:31 UT on previous day. ------------------------------------------------------------------------------------- 17-Oct-2004: ************ 09:54 ESE - Gusty outflow in the form of small ragged fronts. 19:31 NNW - Diffuse and narrow fan-like front that fades throughout C2. 21:30 E - Wide ragged loop front developing slightly toward ESE. It fades throughout C2. Some infalling material early on next day. ------------------------------------------------------------------------------------- 18-Oct-2004: ************ 00:30 ENE - Ragged outflow in the form of elongated and relative thin ragged loop fronts all along the day. 03:54 SW - Elongated and bright twisted structure (diffuse front). It fades throughout C3. 12:30 SW - Elongated spray-like front that fades throughout C2. 12:54 W - Very faint loop front superposed in the LOS with the very slow development of a system of faint loops that started early on the day. By ~ 16:30 UT a brighter asymmetric loop front follows moving much faster. Apparent twisted structures are seen evolving in the LOS. 14:06 NW - Bright and very elongated fan-like front followed at 15:06 UT by a very elongated loop front. A couple more (smaller) at 17:06 and 18:06 UT. 15:30 E - Very diffuse loop-like front that quickly fade. A system of ragged loop fronts begins to develop very slowly toward ENE afterward, superposed in the LOS with a kind of gusty outflow that continues well into next day. ------------------------------------------------------------------------------------- 19-Oct-2004: ************ 01:54 W - Apparent breaking up of a faint loop in the trailing material of event reported on previous day at 12:54 UT. Infalling material? By ~07:30 UT a faint expanding loop front becomes discernible. 17:30 W - Very diffuse and ragged front that fades throughout C2. It is followed at ~ 22:30 UT by an asymmetric and elongated asymmetric loop front much brighter to S that fades close to the inner edge of C3. ------------------------------------------------------------------------------------- 20-Oct-2004: ************ 03:30 SW - Extremely faint (barely visible) 'half-loop' front. It fades in C2. GOES reported a C4.5 X-ray flare from NOAA AR 0682 (S13W23) between 02:09 - 02:16 UT with peak emission at 02:13 UT. 06:30 W - Small, not well defined loop front that fades in C2. 07:31 NE - Diffuse and ragged loop front. It fades close to the inner edge of C3. 08:30 ENE - Faint and elongated front, later surpassed by following event. 11:06 ENE - Bright ragged loop front and trailing material. Faint extensions on SE by 12:54 UT (not discerned in C3, only C2). Couple of faint ragged loop fronts on E and ENE starting at 15:30 UT that fade throughout C3. GOES reported an M2.6 X-ray flare from NOAA AR 0687 (N11E68) between 10:43 - 10:56 UT with peak emission at 10:51 UT. 11:54 W - Faint and not well defined front that fades throughout C2. 17:54 E - Ragged loop front. It fades throughout C3. 22:30 ENE - Initially bright, 'explosive' ragged loop front, later surpassed by following event. ------------------------------------------------------------------------------------- 21-Oct-2004: ************ 00:54 ENE - Bright ragged loop front followed: i) at 02:30 UT, a little bit to S by another bright loop front (narrower), ii) at 05:30 UT, at roughly the same PA as the one at 02:30, by another similar front, which in turn it was preceded at 04:30 UT by a fainter and elongated ragged front, iii) at 07:31 UT by a wider (like the first one) bright ragged loop front and trailing material, iv) at 09:54 UT by a bright and relatively narrow ragged loop front, v) at 14:30 UT, by another ragged loop front, and vi) at 19:54 UT, by a bright and big ragged loop front with structured inner part. During the day, GOES reported several C class X-ray flares from NOAA AR 0687, most likely associated to the events seen in C2: . C7.8 (N11E60) between 00:18 - 00:52 UT; peak emission at 00:40 UT, . C4.3 (N11E62) between 02:10 - 02:18 UT; peak emission at 02:15 UT, . B4.9 (N09E57) between 04:00 - 04:11 UT; peak emission at 04:08 UT, . C2.0 (N05E60) between 05:05 - 05:15 UT; peak emission at 05:12 UT, . C5.2 (N08E57) between 06:44 - 06:57 UT; peak emission at 06:53 UT, . B9.8 (N11E55) between 09:21 - 09:41 UT; peak emission at 09:34 UT, . B9.9 (N07E53) between 14:01 - 14:08 UT; peak emission at 14:06 UT. . C9.9 (N10E50) between 19:24 - 19:56 UT; peak emission at 19:48 UT. 06:30 NNW - Narrow jet-like front that quickly fades. 07:31 WSW - Faint ragged loop front and some trailing material. It fades throughout C3. 17:30 SW - Faint and diffuse front barely visible in C3. Couple of C class X-ray flares from NOAA AR 0682. Peak emissions at 14:42 UT (C1.7 at S14W42), and 15:22 UT (C4.3 at S13W41). 20:06 NW - Faint 'half' loop front expanding toward WNW. ------------------------------------------------------------------------------------- 22-Oct-2004: ************ 02:30 NE - Couple of bright and narrow structures followed at 04:30 UT by a ragged loop front. Very faint in C3. GOES recorded a B6.8 X-ray flare from NOAA AR 0687 (N09E47) between 01:46 - 01:58 UT with peak emission at 01:53 UT. 08:30 NE - 'Explosive', bright, and wide loop front. Trailing material and gusty outflow. A discernible small front at ~19:54 UT. Faint extensions on SE. GOES recorded a M2.1 X-ray flare from NOAA AR 0687 (N11E44) between 07:52 - 08:16 UT with peak emission at 08:11 UT. 09:30 WSW - Very faint and diffuse front extending up to above the W limb. Not discernible in C3. Associated to previous event?? ------------------------------------------------------------------------------------- 23-Oct-2004: ************ 01:31 NE - Very narrow and bright fast loop front. A couple more afterward. GOES recorded a C5.1 X-ray flare late on previous day from NOAA AR 0687 (N15E44) between 22:09 - 22:16 UT with peak emission at 22:13 UT, and a B8.0 X-ray flare from the same AR (N13E42) between 00:59 - 01:08 UT with peak emission at 01:03 UT. 05:54 E - Bright loop front, cavity and inner twisted core. Typical 3-part structure CME. 16:06 ENE - Narrow jet-like front followed at 17:54 UT by a ragged loop front with faint extension on NE and E. GOES recorded a C9.9 X-ray flare from NOAA AR 0687 (N11E30) between 16:22 - 17:08 UT with peak emission at 16:54 UT. ------------------------------------------------------------------------------------- 24-Oct-2004: ************ 00:06 NW - Spray-like front. It fades close to the inner edge of C3. 03:30 NE - Very diffuse loop front just appearing. A couple of diffuse jet- like fronts precede its development: one on NNW and the other one 180 deg apart, on SSE. The whole event is barely visible in C3. GOES recorded several C-class X-ray flares by the time (from NOAA AR 0687): . C1.6 (N13E27) between 01:28 - 01:44 UT; peak emission at 01:42 UT, . C1.9 (N14E30) between 02:23 - 02:30 UT; peak emission at 02:27 UT, . C1.7 (N11E19) between 02:54 - 03:13 UT; peak emission at 03:03 UT. 11:54 NNW - Spray-like front. It fades close to the inner edge of C3. 21:30 NE - Ragged loop front, with a diffuse front (shock?) ahead to N. GOES recorded an M2.3 X-ray flare from NOAA AR 0687 (N10E15) between 20:17 - 20:35 UT with peak emission at 20:28 UT. ------------------------------------------------------------------------------------- 25-Oct-2004: ************ 00:54 E - Ragged and not well defined front. Expanding system of ragged loops behind. They fade throughout C3. 05:30 WNW - Faint jet-like front that quickly fades. Another one at 12:06 UT. 14:06 WNW - Very faint elongated ragged front. It fades throughout C2. 18:06 ENE - Faint, narrow and elongated loop front that fades close to the inner edge of C3. Another one at 21:54 UT, a little bit to N. ------------------------------------------------------------------------------------- 26-Oct-2004: ************ 00:30 WSW - Very slow development of a faint system of expanding loops all along the day with apparent twisted structure. Difficult to give an exact time of first appearance. A blob-like front by the end of the day. 02:54 E - Diffuse and ragged loop front. It fades close to the inner edge of C3. 08:06 E - Another ragged and diffuse loop front, developing toward ENE. It fades throughout C3. 16:06 E - Ragged loop front developing slightly toward ESE. It fades throughout C2. 16:54 W - Ragged loop front developing slightly toward WNW. It fades close to the inner edge of C3. 22:30 W - Ragged loop front that fades throughout C3. ------------------------------------------------------------------------------------- 27-Oct-2004: ************ 03:54 WSW - Faint and narrow ragged front that fades close to the inner edge of C3. 05:30 NW - Faint blob-like front. 06:54 E - Bright and very narrow front that quickly fades. 10:30 ENE - Wide loop front developing mainly toward NE, with another apparent loop front inside. The wide loop front is first seen in C3 at 12:42 UT, exhibiting an average plane-of-sky speed in C3 of about 275 km/sec at PA 63 deg with practically no acceleration. However, that feature shows a slight acceleration while in the C2 FOV. By 14:30 UT, the loop spans about 140 deg in C2 (from PA 340 - 120). Afterward, it seems to fully cover the occultor, having the appearance of a very asymmetric 'full' halo CME, though it is difficult to be certain due to the superposition with the feature described in event reported to start at 12:30 UT on S. 12:30 S - Very faint and diffuse wide loop front. It is too faint (barely discernible) in C3 to give an accurate value of its plane-of-sky speed. However, a value of 312 km/sec at PA 184 was measured. Please note that there is report of only one significant X-ray event prior to this or previous event (the one at 10:30 UT): GOES recorded a C1.1 X-ray flare from the NOAA AR 10687 (N09W19) between 05:54 - 06:05 UT with peak emission at 05:59 UT. It does not seem likely to have any association with any of the features seen in C2. But, on the other hand, EIT 195 images show, starting at about 09:24 UT, what it seems to be a faint ejection from nearby NOAA AR 0691 (~N15E25) toward S. Moreover, by 12:00 UT, it shows another apparent small ejection from NOAA AR 0689 (by the time pretty close to the central meridian, North 10). It is difficult to say if any of the events seen in C2 is related to the apparent ejections seen in EIT. This event jointly with the one at 10:30 UT could have been determined as a complex, probably frontsided event, in spite of the temporal correlation observed with the EIT 195 images. But, it is hard to be certain. 17:30 W - Faint blob-like front. It fades throughout C3. ------------------------------------------------------------------------------------- 28-Oct-2004: ************ 07:31 E - Expanding faint system of loops. Difficult to give an exact time of first appearance. It fades throughout C3. Kind of continuos gusty outflow on SW. NOOA AR 10693 produced several B- and C-class X-ray flares all along the day. 09:30 NW - Diffuse and ragged loop front preceded by an even more diffuse front. By ~ 11:30 UT another faint and not well defined front follows. Another faint ones at ~ 14:54 and 21:54 UT. Gusty outflow. 18:54 SW - Initially bright ragged front that fades throughout C3. Much gusty outflow. GOES reported a B9.0 X-ray flare from NOAA AR 10687 (N13W38) between 18:02 - 18:08 UT with peak emission at 18:05 UT. ------------------------------------------------------------------------------------- 29-Oct-2004: ************ 04:54 NW - Faint and diffuse ragged front that fades close to the inner edge of C3. 09:54 NW - Very thin and elongated front followed at 13:32 UT by a faint and very diffuse elongated front. They both fade throughout C2. 11:30 ESE - Bright ragged loop front. Some infalling material. GOES reported a C1.1 X-ray flare from NOAA AR 10693 (S14E53) between 10:51 - 10:57 UT with peak emission at 10:55 UT. ------------------------------------------------------------------------------------- 30-Oct-2004: ************ 00:06 ESE - Ragged loop front preceded by a faint expanding loop front. It fades throughout C3. **** LASCO Data Gap between 02:30 - 05:30 UT **** 05:30 WNW - Faint and big ragged front already under development after data gap. Later: * by 06:54 UT on W, a bright and wide ragged loop front, * by 07:31 UT, faint circular extensions are discernible all above the E - SE - S Limb. The extensions are not discernible in C3. * at 09:30 UT, a big expanding loop front follows right above the W Limb, * at 12:06 UT, a bright loop front developing mainly toward WSW follows. Circular extensions on NW and all above the E - SE - E Limb are discerned. The extensions are not visible in C3, * at 15:06 UT, a relatively small ragged loop front on W, (HALO) * at 16:54 UT, another bright ragged loop front developing slightly toward WSW. By 17:30 UT, faint circular extensions are discernible above the E - SE - E Limb, and also on NW. An even fainter and diffuse front seems to develop also on NE. By 18:18 UT, the event looks like a very asymmetric 'full' halo CME in C3, * at 18:06 UT, a relatively small and asymmetric loop front follows on W, * and by 20:30 UT, a diffuse and asymmetric loop front develops slightly toward WNW. On the other hand, GOES reported lot of X-ray activity on NOAA AR 10691 since late on previous day. In particular, the following X-ray flares on 2004/10/30: . a C9.7 (N14W19) between 00:39 - 00:53 UT; peak at 00:49 UT, . a M3.3 (N13W20) between 03:23 - 03:37 UT; peak at 03:33 UT, . a M4.2 (N13W22) between 06:08 - 06:22 UT; peak at 06:18 UT, . a C5.5 (N16W22) between 06:55 - 07:05 UT; peak at 07:01 UT, . a M3.7 (N14W24) between 09:09 - 09:30 UT; peak at 09:28 UT, . a C7.2 (N13W25) between 10:20 - 10:41 UT; peak at 10:35 UT, . a C1.0 (N12W26) between 11:17 - 11:27 UT; peak at 11:22 UT, . a X1.2 (N13W25) between 11:38 - 11:50 UT; peak at 11:46 UT, . a C2.6 (N12W27) between 13:59 - 14:10 UT; peak at 14:06 UT, . a M5.9 (N13W28) between 16:18 - 16:37 UT; peak at 16:33 UT (this is the one most likely associated to the HALO CME at 16:54 UT). Please also note that there was a C3.7 X-ray flare from NOAA AR 0687 (N13W59) between 12:45 - 13:03 UT with peak emission at 12:51 UT. 19:54 ESE - Elongated expanding loop front. ------------------------------------------------------------------------------------- 31-Oct-2004: ************ 01:31 W - Ragged loop front. 01:54 NW - Asymmetric and diffuse expanding loop front. Faint extensions over the N Pole. 03:30 ESE - Spray-like front that fades close to the inner edge of C3. 03:30 NE - Elongated and diffuse loop front that fades throughout C2. 06:30 WSW - Ragged loop front followed by gusty outflow. GOES reported an M2.3 X-ray flare from NOAA AR 0691 (N12W36) between 05:23 - 05:39 UT with peak emission at 05:32 UT. Extremely faint extensions seem to surround the C2 occulter during the development of the event. However, no extensions can be seen in C3. 12:06 NW - Very faint and elongated loop front. 18:30 ESE - Elongated expanding loop front preceded by a diffuse and also elongated loop front from which is difficult to give an exact time of first appearance. 20:30 W - Elongated and ragged loop front. It fades throughout C3. 22:30 W - Big ragged loop front and gusty outflow. Faint extensions to N. GOES reported a C7.0 X-ray flare from NOAA AR 0691 (N11W45) between 21:08 - 21:38 UT with peak emission at 21:27 UT. ===================================================================================== 01-Nov-2004: ************ 00:54 W - Ragged loop front. GOES reported a B7.8 X-ray flare (N13W48) between 00:34 - 00:40 with peak emission at 00:38 UT. 03:54 W - Bright loop front. By 04:06 UT, very faint extensions show up above HALO the S and N Poles. Shortly afterward, a very tenuous 'full' halo seems to evolve in the C2 FOV. The loop front is first seen in C3 at 04:42 UT, above the W Limb. The halo extensions are not discernible, either because they are too faint to be seen or because they are masked by the next 'energetic' event (06:06 UT). Please note that the angular extent of the loop front developing toward W is only ~ 90 deg (from PA ~230 - 320). The mean plane-of- sky speed of the LE of the loop front at PA 271 was ~ 555 km/sec (based on C2 and C3 data, C3 only a couple of points due to superposition with the following event). GOES reported an M1.1 X-ray flare on NOAA AR 10691 (N12W49) between 03:04 - 03:26 UT with peak emission at 03:22 UT, most likely asssociated to the events described above. EIT 195 images show a strong brightening on the aforementioned AR at 03:24 UT, followed by an intensity disturbance travelling across the disk developing mainly toward W and S. In summary, this event has therefore been determined as a very faint 'full' halo CME, frontsided, only seen in C2. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041101. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/269.html 06:06 W - Big and very wide loop front and trailing material. Proton storm starting at ~06:30 (C2 time). The event is faster than the previous one (mean plane-of-sky speed of ~ 790 lm/sec at PA 271, based on C3 data), and it is first seen in C3 above the W Limb at 06:42 UT. By 08:18 UT, it seems to have surpassed the CME reported to start at 03:54 UT. EIT 195 images show a big CME coming from behind the W Limb, starting at 05:48 UT. See also movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041101 14:30 W - Elongated ragged loop front that fades throughout C3. It is preceded at 11:06 UT by a fainter and ragged front, masked in the trailing material of previous event. ------------------------------------------------------------------------------------- 02-Nov-2004: ************ 03:06 W - Elongated spray-like front that fades throughout C3. It is followed at 05:30 UT by an elongated and 'sharp' expanding loop front. It also fades throughout C3. 03:54 WNW - Another elongated spray-like front. It fades very close to the inner edge of C3. 05:30 NW - Very slow development of a system of expanding loops along the streamer. It is difficult to give an exact time of first appearance. By the end of the day, the 'leading edge' is close to the outer edge of the C2 FOV. ------------------------------------------------------------------------------------- 03-Nov-2004: ************ 02:06 W - Kind of 'explosive' (and initially bright) ragged loop front. Infalling material afterward. Pushed material superposed in the LOS on NW with the slow development of the system of loops reported on previous day (05:30 UT). The event fades throughout C2. GOES reported an M2.8 X-ray flare from NOAA AR 0691 (N12W75) between 01:23 - 01:37 UT with peak emission at 01:33 UT. EIT 195 images show a strong brightening on NOAA AR 0691 at 01:36 UT and a big CME signature afterward, all above the western Limb. 03:54 ENE - Bright loop front with a very faint and diffuse extension all above Partial the SE Limb and S Pole. It develops toward NE as a bright loop front, Halo the southern leg much fainter than the rest. By 04:30 UT, a ragged front begins to be seen above the S Pole. Its evolution shows that this front seems to extend all above the W Limb, N Pole, and NE Limb, looking like a second front in the C2 FOV (just behind the original one at 03:54 UT) on NE. The event was first seen on C3 above the E Limb, developing afterward mainly toward NE as an asymmetric loop front. The event looks pretty faint on SE, S, SW, and W. By the time, the LE on NE reaches the outer edge of C3 (about 10:42 UT), the event looks like a partial halo, spanning ~ 135 deg from PA 330 - 105. However, in C2 one could say that the event (bulk of the mass plus eventual shock) covers completely the occultor. The mean plane-of-sky speed of the LE of the front at PA 49 was ~ 750 km/sec (based on C3 data) showing practically no acceleration. GOES reported an M1.6 X-ray flare on NOAA AR 10696 (N09E45) between 03:23 - 03:57 UT with peak emission at 03:35 UT, most likely associated to the event described above. EIT 195 images show a strong brightening on the aforementioned AR at 03:36 UT, followed by an intensity disturbance travelling mainly toward NE, jointly with a wave-like disturbance travelling partially across the disk with apparent epicenter on AR 10696. In summary, and based on its appearance in the C3 FOV, the event has therefore been determined as a partial halo CME, frontsided. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041103a. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/270.html 16:06 ENE - Bright loop front with a faint and diffuse extension all above the HALO SE Limb and S Pole. It's morphology is pretty similar in appearance to that of the event at 03:54 UT. The difference is basically that i) it moves apparently faster, ii) the faint extensions on SE and S look a little bit brighter, and iii) the C3 occultor seems to be completely covered (by 18:42 UT). The event is first seen in C3 at 16:42 UT. The mean plane-of-sky speed of the LE of the front at PA 43 was ~ 1016 km/sec (based on C3 data) showing practically no acceleration. GOES reported an M5.0 X-ray flare on NOAA AR 10696 (N09E38) between 15:35 - 15:55 with peak emission at 15:47 UT, most likely associated to the event described above. EIT 195 images show a strong brightening on the aforementioned AR at 15:48 UT, followed as in the previous reported event by an intensity disturbance travelling mainly toward NE, jointly with a wave-like disturbance travelling partially across the disk with apparent epicenter on AR 10696. In summary, the event has therefore been determined as an asymmetric 'full' halo CME, frontsided. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041103b. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/271.html 18:54 ENE - Ragged expanding front with a bright inner part. Please also note that GOES reported an M1.0 X-ray flare again from NOAA AR 10696 between 18:03 - 18:35 UT with peak emission at 18:26 UT. EIT 195 images show a brightening on the aforementioned AR starting at ~ 18:00 - 18:12 UT and an intensity disturbance shortly afterward travelling mainly toward W. By 22:08 UT, the event spans only about 70 deg in C3, from PA 20 - 90. 23:40 N - Faint and big expanding loop front. ------------------------------------------------------------------------------------- 04-Nov-2004: ************ 01:54 NE - Faint and diffuse elongated loop front. 04:06 SW - Ragged loop front that fades in C3. 09:54 NE - Bright loop front with a faint and diffuse extension all above Partial the NW, W, and NW Limbs. The event was first seen on C3 at 10:42 UT Halo above the NE Limb, developing mainly toward NE. The extensions continue very clear all around the N Pole, NW, W, and SW Limbs. Nothing can be distinguished above the SE Limb. By 13:42 UT, the event (excess brightness) spans in C3 ~ 280 deg from PA 180 - 100. The mean plane-of-sky speed of the LE of the front at PA 31 was ~ 635 km/sec (based on C3 data) showing practically no acceleration. GOES reported an C6.3 X-ray flare on NOAA AR 10696 (N09E28) between 08:45 - 10:04 UT with peak emission at 09:05 UT, most likely asssociated to the event described above. EIT 195 images show a brightening on the aforementioned AR at 09:00 UT, with signatures of a CME developing mainly towards NE. But please note that since around 07:13 UT excess activity begins to be seen on that AR. GOES reported also a C1.0 X-ray flare on NOAA AR 10696 (N09E28) between 07:23 - 07:28 UT with peak emission at 07:26 UT. In summary and based on its appearance in the C3 FOV, the event has therefore been determined as a partial halo CME, frontsided. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041104a. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/272.html 16:30 ESE - Faint and elongated expanding loop front. 23:30 NE - Extremely bright loop front spanning all above the N Pole. By Partial 00:30 UT on next day, fainter extensions can be seen all around Halo the western hemisphere. The event was first seen on C3 at 23:42 UT just appearing above the NE Limb, and developing mainly toward NE. The events looks much brighter than the previous reported one. Even though, nothing can be distinguished above the SE Limb. Close inspection of C3 images show apparently another front coming behind the first front. This first front seems to develop mainly toward NE while the second one seems to be the one that continues all around the western hemisphere. The whole event spans in C3 about 290 deg (by 02:42 on 2004/11/05) from PA 180 - 110. The mean plane-of-sky speed of the LE of the outermost front at PA 27 was ~ 1053 km/sec (based on C3 data) and showing practically no acceleration. GOES reported an M2.5 X-ray flare on NOAA AR 10696 (N11E19) between 21:42 - 22:53 UT with peak emission at 22:29 UT, most likely associated to the first front; and an M5.4 X-ray flare on the same AR (N08E18) between 22:53 - 23:26 UT with peak emission at 23:09 UT, most likely asssociated to the second front. EIT 195 images show a brightening on the aforementioned AR at ~22:00 UT, with signatures of a CME developing mainly towards NE. A strong wave-like intensity disturbance can be distinguished developing mainly toward N, NW, and W. By 23:12 UT another strong brightening can be seen on the aforementioned AR developing afterward with similar morphological characteristics as before. In summary, and from a global point of view, the event as a whole has therefore been determined as a complex partial halo CME, frontsided. Please keep in mind that in fact two events close in space and time occurred. See movies and images of the complex event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041104b. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/273.html ------------------------------------------------------------------------------------- 05-Nov-2004: ************ 03:30 N - In the aftermath of previous halo event, several faint and expanding loop fronts. 06:30 W - Jet-like front that quickly fades. It is followed at 07:54 UT by a bright and very narrow 'fan-like' loop front. 10:30 W - Similar event to the previous one. A jet-like front that quickly fades preceding at 12:06 UT a brighter feature resembling a very narrow loop front. 12:54 ENE - Ragged and elongated front. It is preceded at 10:54 UT, on E, by a very faint and diffuse loop front that fades throughout C2. Apparent expanding outflow all around the occulter. GOES reported an M4.0 X-ray flare on NOAA AR 10696 (N08E15) between 11:23 - 11:33 UT with peak emission at 11:30 UT. 14:54 W - Bright and narrow front that fades throughout C3. ------------------------------------------------------------------------------------- 06-Nov-2004: ************ 01:31 N - Extremely bright loop front spanning all above the N Pole. Faint Partial extensions can be seen on SW. By 02:06 UT, an apparent new front Halo seems to develop in C2 toward N. C3 images show the complex event starting at 02:18 UT, almost surrounding completely the occultor. However, as in previous events, the signal is barely visible above the S Pole and on SE. After 02:42 UT, C3 images show the development of a more diffuse front mainly toward NE (extensions on SW apparently associated with this first front) followed by a brighter front spannig ~ 215 deg, from PA 265 - 120 (05:18 UT). By 06:18 UT, the angular span of the event considered as a whole is about 275 deg from PA 205 - 120. The mean plane-of-sky speed of the LE of the outermost front at PA 23 was ~ 960 km/sec (based on C3 data) showing an slight acceleration. And just for reference, the mean plane-of-sky speed of the outermost front at: i) PA 093: 643 km/sec, and ii) PA 256: 550 km/sec. GOES recorded three X-ray flares almost one after another form NOAA AR 10696, by the time at N10E08: . an M9.3 between 00:11 - 00:42 UT with peak emission at 00:34 UT, . an M5.9 between 00:44 - 01:10 UT with peak emission at 00:57 UT, . an M3.6 between 01:40 - 02:08 UT with peak emission at 01:57 UT. EIT 195 images show a brightening on the aforementioned AR starting at ~ 00:24 UT, and peaking at 00:36 UT. Signatures of a big CME develop afterward with epicenter on the AR are clearly visible. Another brightenings on the same AR can be seen at 01:13 UT, and 01:48 UT. In spite of the weakness of the signal above the S Pole and SE Limb, and from a global point of view, the event as a whole has therefore been determined as a complex partial halo CME, frontsided. However, the symmetry of the event makes it suspicious and one is lead to think whether it was a full halo. Please also keep in mind that in fact a couple of events close in space and time occurred. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041106. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/274.html 05:30 N - Elongated ragged loop front in the halo aftermath. Also an expanding loop front on NW. 08:06 NE - Fast and elongated fan-like front. It fades throughout C3. It is followed at ~ 11:54 UT by a very faint and diffuse loop front barely visible in C3. 12:30 NNW - Diffuse and ragged loop front that fades throughout C3. 18:54 NNW - Very faint, elongated and diffuse loop front in the trailing material of previous event. Infalling material to S. It is followed at ~ 23:30 UT by a similar front. Gusty outflow. 19:31 ESE - Ragged loop front that quickly fades. 22:30 W - Faint spray-like front developing slightly toward WSW. It quickly fades. ------------------------------------------------------------------------------------- 07-Nov-2004: ************ 03:30 NW - Ragged front in gusty outflow. By 06:30 UT, a faint loop front develops, fading later throughout C3. 07:54 ESE - Faint ragged loop front. 09:30 NE - Jet like front that quickly fades. 09:30 NW - Ragged loop front followed a little bit to S by the very slow development of a system of loops along the streamer. 14:30 NW - Bright loop front above the NW Limb, developing superposed in the LOS with the slow evolution of a system of loops along the streamer. By 17:06 UT, the event is completely surpassed by the following 'halo' event. See next event for more details. 17:06 NW - Bright and very wide loop front, developing mainly toward WNW, HALO with faint extensions on S that give the appearance of a full halo CME from its very beginning. The halo event is first seen in C3 at 17:18 UT. Please note that the previous front (the one at 14:30 UT) first appeared in C3 at 16:18 UT, being completely surpassed by the halo event at 17:18 UT. During the evolution of the halo event in the C3 FOV, a proton storm develops, becoming stronger by 21:30 UT (C2 time). The mean plane-of-sky speed of the LE of the outermost front at PA 2 was ~ 1770 km/sec (based on C3 data) showing practically no acceleration. If taken into account the LE as the outermost part of the brightest feature (not the outermost one), the mean speed was 1460 km/sec at PA 356. And just for reference, the mean plane-of-sky speed of the outermost front at: i) PA 052: 1180 km/sec, and ii) PA 229: 1100 km/sec. GOES recorded high X-ray activity with several B- and C-class X-ray flares all along the day from NOAA AR 10696. In particular, note the X2.0 X-ray flare from that AR (N09W17) between 15:42 - 16:15 UT with peak emission at 16:06 UT, most likely associated to the Halo event. It is also worth to mention the C7.0 X-ray flare (N08W14) between 13:58 - 14:20 UT with peak emission at 14:07 UT, most likely related to the event reported to be seen on NW at 14:30 UT. EIT 195 images show a brightening on the aforementioned AR starting at ~ 14:00 UT, followed at 15:12 UT by the apparent ejection of material toward NW. By 16:00 UT, a very strong brightening is seen to occur above the aforementioned AR (signature of the X2.0 X-ray flare) followed by a strong intensity disturbance travelling across the disk with epicenter in that AR (the disturbance is stronger toward N). For completeness, please note that the C3 images show, starting at about 21:18 UT, signatures of what it could be considered as an apparent much fainter and ragged halo in the aftermath of the previous big halo event. In summary, the event as a whole has therefore been determined as a 'full' halo CME, frontsided. But please keep in mind that in fact a couple of events close in space and time occurred. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041107. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/275.html 22:30 NW - 'Explosive' ragged front in the halo aftermath. ------------------------------------------------------------------------------------- 08-Nov-2004: ************ 04:06 S - Signatures likely related to the event were first seen in the C2 HALO FOV at 04:06 UT: i) a faint and diffuse loop front above the S Pole, and ii) a narrow and brighter ragged front developing toward NW, preceded at 03:30 UT by ragged and not well defined narrow front. By 04:30 UT, the C2 occultor is already completely covered by a rather symmetric and diffuse halo. Signatures of the event marked as ii) are first seen in C3 at 04:18 UT surrounded by a diffuse front ahead of it. The 'halo' itself covers the C3 occultor by 05:42 UT. For reference, the mean plane-of-sky speed of the outermost front of the 'halo' at several PA was: a) PA 042: 443 km/sec, b) PA 214: 520 km/sec, and c) PA 147: 430 km/sec. As for the elongated feature in NW, the mean plane-of-sky speed at PA 318 was ~ 500 km/sec. EIT 195 images show a brightening on NOAA AR 10696 starting at ~ 02:12 UT, peaking at 02:24 UT, and followed by an intensity disturbance (CME signature) developing apparently toward N, E, and S. Another brightening can be distinguished at 03:36 UT, most likely related to a C7.9 X-ray flare (see below). GOES recorded a C7.9 X-ray flare (during a long duration X-ray event) from NOAA AR 10696 (N08W20) between 03:25 - 03:36 UT with peak emission at 03:29 UT, possibly associated to the event related to the features described in ii). Please also note that the CME signature in EIT is before the X-ray flare. Also several optical flares from nearby that AR were reported, in particular at 02:24, 02:45, 03:00, and 03:30 UT (peak emission). In summary, the event as a whole has therefore been determined as a 'full' halo CME, frontsided. But again please keep in mind that in fact a couple of events close in space and time occurred. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041108. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/276.html 07:31 SW - Elongated loop front that fades throughout C3. **** LASCO Data Gap between 11:06 - 14:06 UT. **** 14:54 NW - Bright ragged loop front preceded at ~ 11:06 UT by a fainter ragged front. Gusty outflow well into next day. GOES reported a C7.7 X-ray flare from NOAA AR 10696 (N06W35) between 14:30 - 14:38 UT with peak emission at 14:35 UT. There is a report from NOAA of another X-ray flare afterward from the same AR: an M2.3 X-ray flare (N08W36) between 15:43 - 15:52 UT with peak emission at 15:49 UT. By 17:30 UT an extremely faint and not well defined front could be guessed in the C2 FOV. ------------------------------------------------------------------------------------- 09-Nov-2004: ************ 01:27 WNW - Ragged loop front followed by an elongated ragged loop front a little bit to S (at 02:50 UT). By 05:06 UT another ragged front follows. Infalling material to S, on W Limb. They all fade throughout C3. 09:26 ESE - Bright ragged loop front and trailing material. A faint twisted structure seems to develop very slowly afterward superposed in the LOS with the trailing material. 17:26 WNW - Very bright and wide loop front. By 17:50 UT, the LE already exited Asymmetric the C2 FOV (the event develops mainly toward NW). Faint extensions HALO (shock?) up to NE. The C2 occultor is completely surrounded by the faint extensions by 18:26 UT, though on SE the excess intensity is just above the occulter. C3 images show the event starting at 17:48 UT, on NW. By 18:18 UT the C3 occultor is completely covered, the event having the appearance of a very asymmetric 'full' halo event. Please note that the 'bulk' of the mass, i.e., the loop front itself, only spans from PA 215 - 360 (at 18:42 UT, measured in C3). For reference, the mean plane-of-sky speed of the outermost layer of the 'halo' at several PA was: i) PA 297: 1853 km/sec, ii) PA 004: 967 km/sec, and iii) PA 224: 1236 km/sec. EIT 195 images show a strong brightening on NOAA AR 10696 starting at ~ 17:12 UT, and followed by an intensity disturbance developing across the Sun's surface with epicenter in the AR. GOES recorded a M8.9 X-ray flare from NOAA AR 10696 (N08W51) between 16:59 - 17:32 UT with peak emission at 17:19 UT, most likely associated to the halo event. In summary, the event has therefore been determined as an asymmetric 'full' halo CME, frontsided. Much gusty outflow follows. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041109. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/277.html 18:50 SE - Bright ragged loop front starts to develop toward SE. Trailing material. The bright ragged loop is most likely associated to activity on the SE Limb, as can be seen in the EIT 195 images starting at 17:36 UT (Limb CME signature). ------------------------------------------------------------------------------------- 10-Nov-2004: ************ 02:26 WNW - Very bright and wide loop front, pretty fast. By 02:50 UT, the LE Asymmetric already exited the C2 FOV (the event develops mainly toward NW). HALO A proton storm starts developing by the time and continues all day long and well into next day. Faint extensions (shock?) up to NE. The C2 occultor is completely surrounded by the faint extensions by 03:06 UT, though on SE the excess intensity is just above the occulter. C3 images show the event starting at 02:42 UT developing toward NW. By 03:42 UT, the C3 occultor is completely covered (as in C2, the excess intensity on SE is seen barely above the occulter), the event having the appearance of a very asymmetric 'full' halo event. Please note that the 'bulk' of the mass, i.e., the loop front itself only spans from PA 215 - 010 (at 03:42 UT, measured in C3). For reference, the mean plane-of-sky speed of the outermost layer of the 'halo' at several PA is given (based on C3 data): i) PA 305: 2900 km/sec (*), ii) PA 002: 1975 km/sec, and iii) PA 221: 1477 km/sec; showing practically no acceleration. (*) The error is big as the outermost part becomes very diffuse. Just for completeness, if taken as LE the brightest part of the LE of the front at PA 305, the mean plane-of-sky speed becomes almost 2000 km/sec, pretty much alike the one at PA 002. GOES recorded an X2.5 X-ray flare from NOAA AR 10696 (N09W49) between 01:59 - 02:20 UT with peak emission at 02:13 UT, associated to the halo event. EIT 195 images show an extremely strong brightening on NOAA AR 10696 starting at ~ 02:12 UT, and followed by an intensity disturbance developing across the Sun's surface with epicenter in the AR. Release of a huge amount of material from a big extension on the Earth-side face of the Sun can be guessed also from the EIT images. In summary, the event has been determined as an asymmetric 'full' halo CME, frontsided. Much gusty outflow on NW afterward. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041110. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/278.html 04:50 WNW - In the halo aftermath, an asymmetric and ragged expanding loop front develops. By 05:50 UT, at roughly the PA of its northern leg (NW), an elongated and ragged loop front can be guessed followed by much gusty outflow. 10:50 E - Very faint and small expanding loop front that fades throughout C3. 13:27 WNW - Diffuse, narrow and apparently loop-like front that fades in C3. 17:06 WNW - Faint expanding fan-like front accompanied by gusty outflow to N. Difficult to give an exact time of first appearance. It is followed at 21:26 UT by a blob-like front. 18:06 ESE - Ragged and not well defined front that quickly fades. ------------------------------------------------------------------------------------- 11-Nov-2004: ************ **** LASCO Data Gap between 02:06 - 05:26 UT **** 05:26 W - Elongated fan-like front developing slightly toward WSW. Infalling material to S. 07:27 E - Extremely faint ragged loop front developing slighty toward ENE. It fades very close to the inner edge of C3. 18:26 E - Faint spray-like front that fades close to the inner edge of C3. 20:26 WSW - Very faint and narrow (jet-like) loop front vanishing by 23:50 UT. By that time, a faint loop front is seen instead fading in C3. ------------------------------------------------------------------------------------- 12-Nov-2004: ************ 01:27 WSW - Very narrow loop front (jet-like) that fades very close to the inner edge of C3. 08:50 SW - Extremely faint ragged front that fades throughout C2. EIT 195 shows between 07:36 - 08:24 UT on SW, very faint loops and filament erupting. 10:50 ESE - Faint and diffuse asymmetric loop front that fades throughout C3 (extremely faint in C3). 12:26 ESE - Slow development of a system of narrow loops along streamer. Exiting the C2 FOV by the end of the day. **** LASCO Data Gap between 19:26 - 23:39 UT **** ------------------------------------------------------------------------------------- 13-Nov-2004: ************ 08:06 NW - Extremely faint loop front that quickly fades. Infalling material. 11:26 W - Extremely faint and diffuse front that quickly fades. 18:26 W - Faint ragged loop front followed at ~ 20:06 and 22:06 UT by a couple of similar fronts. They all fade throughout C2. 20:50 NW - The development of a very faint asymmetric loop front begins to be discernible already half way across the C2 FOV, above the NW Limb. Barely discernible in C3. ------------------------------------------------------------------------------------- 14-Nov-2004: ************ 00:50 NW - Very faint spray-like front that fades throughout C2. Infalling material. 08:50 NW - Elongated spray-like front. It also fades throughout C2. 10:06 W - Faint and diffuse ragged front. It fades throughout C2. 11:26 SW - Faint and elongated loop front that fades close to the inner edge of C3. 13:27 W - Small front that quickly fades. Still infalling material to N. ------------------------------------------------------------------------------------- 15-Nov-2004: ************ 00:06 SSE - Faint expanding loop front. It is preceded by an extremely faint slow-developing system of loops since previous day (difficult to give an exact time of first appearance). It spans over the S Pole by ~ 02:50 UT. 15:50 E - Very faint and elongated expanding asymmetric loop front developing slightly toward ENE. It fades very close to the inner edge of the C3 FOV. 16:26 NNW - Faint and diffuse ragged loop front. It fades in C3. Infalling material to S. 23:06 SE - Faint and narrow loop that fades throughout C3. 23:50 W - Extremely diffuse and not well defined front that extends up to NW precedes a brighter front at 02:50 UT (see next day (*)). Infalling material on WSW. ------------------------------------------------------------------------------------- 16-Nov-2004: ************ 02:50 W - Ragged loop front (*) preceded by a wide and diffuse front that extends up to NW. Another similar ragged front by 04:06 UT. 06:26 NE - Very bright loop front followed apparently by another bright front. Trailing material. The mean plane-of-sky speed of the LE at PA ~ 50 deg was ~ 435 km/sec showing practically no acceleration (based on C3 data). Please note that already since 04:26 UT (C2 time) excess intensity in the form of a diffuse front can be seen above the NE Limb. Some asymmetric fronts are discernible in the trailing material, in particular one at ~ 17:36 UT (on E). 11:50 SW - Very faint and diffuse elongated loop front. It fades throughout C2. 14:50 SW - Another very faint and diffuse loop front. It fades close to the inner edge of C3. 19:27 W - Slow development of a system of loops along a streamer. Difficult to give an exact time of first appearance. 21:50 ESE - Faint loop front that fades close to the inner edge of C3. 23:26 W - Elongated ragged loop front with structured interior almost superposed in the LOS with event reported to start at 19:27 UT. Gusty outflow into next day. The event develops slightly toward WSW. The development of the slow system of loops seems to be affected by this event, though it is difficult to say. 23:50 NE - In the aftermath of event at 06:26 UT, much gusty outflow on NE (along a streamer) well into next day after a narrow front that seems to form at around 23:50 UT. Several other blob-like fronts all along the next couple of days. ------------------------------------------------------------------------------------- 17-Nov-2004: ************ 09:26 E - Narrow loop front that fades close to the inner edge of C3. 12:06 E - Small and bright ragged loop front accompanied by a fainter and ragged loop front to S that develops slower (extremely faint in C3). Infalling material. 19:27 E - Another narrow (small) and ragged loop front that fades throughout C2. ------------------------------------------------------------------------------------- 18-Nov-2004: ************ 00:06 WSW - Diffuse ragged front that quickly fades followed at ~ 01:27 UT by another one that also quickly fades. Gusty outflow all along the day. 04:06 E - Narrow and elongated loop front followed at ~ 06:26 UT by a faint asymmetric front. Infalling material afterward all along the day. 18:26 WSW - Ragged loop front that fades close to the inner edge of the C3 FOV. A bright and elongated feature can be seen at the beginning at roughly the PA of the northern leg of the loop. By ~ 20:06 UT, an apparent twisted structure starts developing very slowly, superposed in the LOS with the passage of the ragged loop front. 20:06 E - A faint blob-like front starts to be discernible. It fades in C3. Infalling material continues. ------------------------------------------------------------------------------------- 19-Nov-2004: ************ 05:50 W - Elongated and ragged loop-like structure developing slightly toward WSW. It is preceded at 03:06 UT by a small and narrow front that quickly fades. The slow development of an apparently twisted and faint structure to S continues. 16:26 SW - Small and diffuse front that quickly fades. 20:26 SW - Faint and diffuse front followed at around 23:06 UT on WSW by an expanding ragged loop front. A narrow and structured feature seems to develop at roughly the PA of the northern leg of the expanding loop front (above the W Limb). ------------------------------------------------------------------------------------- 20-Nov-2004: ************ 00:26 SW - Superposed in the LOS with the event reported to start at 20:26 UT on previous day, a rather circular twisted structure (with later twisted trailing material) starts developing very slowly (difficult to give an exact time of first appearance). It is clearly seen in C3 at ~ 16:42 UT. 06:26 SE - Extremely faint loop front that quickly fades. 09:06 NW - Faint and narrow fan-like front. 16:06 W - Narrow and elongated structured feature. 18:26 E - Bright loop front with fainter extensions to N and S. ------------------------------------------------------------------------------------- 21-Nov-2004: ************ 00:06 NE - Very faint expanding loop front followed at ~ 07:27 UT by a well defined 'pair formation' event (separation point at ~ 3 solar radii -PA ~ 30 deg- ). By around 10:06 UT, some other very faint fronts. They al fade throughout C3. 13:50 E - Faint ragged and small front that fades close to the inner edge of C3. 15:26 NW - Jet-like front. 18:06 E - Narrow ragged loop front that fades close to the inner edge of C3. 22:26 E - Another narrow ragged loop front that also fades close to the inner edge of C3 (same PA as previous event). 23:26 SW - Blob-like front develops along the streamer, followed by a couple of smaller fronts: 'Reconexion' type events (infalling material afterward). ------------------------------------------------------------------------------------- 22-Nov-2004: ************ 02:26 E - Faint and narrow fan-like front that fades throughout C2. 06:50 E - Bright loop front preceded by a diffuse brightening starting at about 05:26 UT. Structured inner part. By 10:26 UT a narrow loop- like feature seems to develop followed at ~ 12:50 UT by a blob- like front. Some infalling material. 08:06 N - Jet-like front developing toward NNE. 10:50 NW - Very faint and elongated narrow loop front. It fades throughout C2. 15:26 SW - Diffuse and faint front preceding the slow development of a system of loops along the streamer. 17:50 N - Jet-like front that quickly fades. 22:53 E - Another small blob-like front can be discerned developing in the aftermath of the event reported to start at 06:50 UT. More blob- like fronts along next day. ------------------------------------------------------------------------------------- 23-Nov-2004: ************ 02:06 N - Faint expanding loop front becomes discernible. It fades throughout C3. It is preceded by a very faint system of expanding loops since afternoon on previous day. 03:50 E - Elongated and narrow loop front that fades very close to the inner edge of C3. Infalling material to N, already since early in the day, all along the day. 09:26 E - Extremely faint and diffuse front that quickly fades. 12:06 E - Blob-like front becomes discernible in the gusty outflow. **** LASCO Data Gap between 14:06 - 17:50 UT **** 18:06 NNW - Couple of extremely faint loop fronts already under development after data gap. Some others follow, also into next day. ------------------------------------------------------------------------------------- 24-Nov-2004: ************ 03:26 SE - Kind of 'reconexion' event (pair formation: blob-like front going out and another one falling down). Difficult to give an exact starting time. Separation point: ~ 4 solar radii at PA ~ 110 deg. More infalling material to N. 03:50 NW - Faint loop front developing toward WNW. It fades throughout C2. An elongated and narrow feature develops by the time at roughly the PA of the northern leg of the loop front. This feature can be followed in C3 only close to the inner edge. 04:26 SW - Faint elongated and expanding loop-like feature developing slowly. Difficult to give an exact time of first appearance. 08:26 E - Diffuse and ragged loop front that fades throughout C2. It seems to be preceded at 07:27 UT by a a very diffuse and narrower front right above the E Limb. Couple of slightly brighter fronts follow (also narrower than the first one mentioned, spray-like) starting at 09:50 and 12:06 UT. 12:50 NE - Initially bright loop front develops along streamer. It is followed by another loop front developing similarly, not as bright, at 17:06 UT. Another one at 20:06 UT. 18:06 E - Narrow ragged loop front. Couple more a little bit to N by 19:50 UT and 20:54 UT. The development of the last two ones show very faint loop-like extensions to N, that seems to connect with the corresponding loop fronts developing along the streamer at 17:06 and 20:06 UT (see entry at 12:50 UT). 19:50 WSW - Very faint and small front developing toward W that quickly fades. 22:06 E - Faint and diffuse loop front preceding at 23:26 UT on NE (at roughly the PA of its northern leg) a ragged looop front along the streamer, and a narrow ragged loop front on E at 00:26 UT on next day. As in previous case, this narrow loop front on E would seem to be connected by faint extensions to the loop along streamer. Gusty outflow follows along the streamer on NE. ------------------------------------------------------------------------------------- 25-Nov-2004: ************ 02:26 E - Narrow ragged loop fronts continue developing. Other ones at 04:50 and 06:26 UT. 05:50 SW - Very faint loop front is seen to start development at a couple of solar radii above the limb. 07:50 NNW - Very faint blob-like front. Difficult to give an exact time of first appearance. Some others follow on NW. 11:26 NE - Bright loop front with some twisted trailing material. ------------------------------------------------------------------------------------- 26-Nov-2004: ************ 02:26 NW - Small blobs start to be discerned at a couple of solar radii above the limb. 02:50 W - Very narrow and small loop front. Also very slow development of a faint and apparently twisted feature superposed in the LOS with some outflow. Difficult to give an exact time of first appearance. By that time, on WSW, an elongated and narrow loop-like feature develops. 16:26 E - Jet-like front that quickly fades. ------------------------------------------------------------------------------------- 27-Nov-2004: ************ WSW - Since early in the day, very slow development of an extremely faint system of loops. W - Several blob-like fronts start developing already at a couple of solar radii above the limb since early in the day. They continue all along the day. Corresponding infalling material. 04:06 SW - Jet-like front that quickly fades. 11:26 E - Elongated loop-like front with twisted trailing material. It fades throughout C3. 23:26 E - Kind of 'spray-like' front. It is preceded by 20:06 UT (difficult to give an exact time) by a faint front on ENE that is pushed toward N as the spray-like front develops. ------------------------------------------------------------------------------------- 28-Nov-2004: ************ 05:26 E - Ragged front developing toward NE. It fades in C3. 06:50 W - Jet-like front. 15:26 E - Extremely narrow loop front (jet-like) that fades throughout C2. ------------------------------------------------------------------------------------- 29-Nov-2004: ************ 01:27 E - Initially bright front that fades throughout C2. Faint diffuse extensions to N. Another very faint expanding front follows on NE developing toward NE (~ 03:26 UT). 06:26 E - Another initially bright front followed at 08:06 UT on ENE-NE by an asymmetric and structured expanding loop-like feature. By 08:26 UT a bright narrow feature follows, a little bit to N. And by 12:50 UT (though difficult to give an exact time) a faint and narrow loop front can be discerned already at around 1.5 solar radii (NE+ Limb). 17:50 NE - Very narrow and elongated loop-like feature (jet-like) that fades close to the inner edge of C3. ------------------------------------------------------------------------------------- 30-Nov-2004: ************ 07:27 NE - Bright ragged loop front. By 07:50 UT, a narrow and asymmetric ragged feature can be discerned on ENE (at roughly the PA of the southern leg of the big loop front). GOES reported a C4.8 X-ray flare from NOAA AR 10708 (N09E33) between 06:32 - 07:22 UT with peak emission at 06:58 UT. By 11:26 UT a faint ragged loop front can be discerned developing toward NNE in the trailing material of the event (fading throughout C3). Also by that time, on ENE, a faint an asymmetric expanding loop front seems to develop. Please note that GOES also reported a C1.8 X-ray flare from NOAA AR 10707 (S13W05) between 10:54 - 11:06 UT with peak emission at 11:02 UT, though it is difficult to establish any association to the C2 events described above. **** LASCO Data Gap between 16:51 - 20:01 UT due to **** **** EIT Shutterless Campaign between 17:00 - 19:40 UT. **** 20:01 NNW - Faint loop front followed by what looks like a system of thin loops apparently extending all above the western hemisphere. 22:33 NE - Small jet-like front that quickly fades. ===================================================================================== 01-Dec-2004: ************ 02:29 SW - Faint asymmetric front that seems to extend later up to NW. 04:53 NNE - Jet-like front. 07:53 NNE - At least three different features can be guessed at this time: i) a diffuse ragged front that will develop mainly toward NE-NNE, ii) a wide and ragged loop front that extends up to above the N Pole, (just appearing at this time), and iii) a bright front also just appearing on ENE that will develop as a relative narrow loop (as compared to the other two features). Both, the feature described in i) and the one in iii) are first seen in the C3 FOV at 08:18 UT, while the wide loop in ii) is first seen in C3, all above the N Pole, by 09:18 UT. The total angular spans by 10:42 UT is about 180 deg (C3), form PA ~ 270 - 090, and it matches apparently the angular span of the wide loop front [ii)]. The mean plane-of-sky speed of the LE of the different features observed is given below (based on C3 data): Feature i) : PA 036 --> 742 km/sec Feature ii) : PA 342 --> 326 km/sec Feature iii): PA 073 --> 731 km/sec GOES recorded an M1.1 X-ray flare from NOAA AR 10708 (N09E19) between 07:00 - 07:41 UT with peak emission at 07:20 UT, most likely associated to at least one of the features described above. EIT 195 images show a strong brightening on NOAA AR 10708 at 07:13 UT, followed by a rather circular intensity disturbance traveling away from the AR. In summary, the event has therefore been determined as a complex partial halo event, with at least one of its components, frontsided. Keep in mind that several features contribute to the overall morphology of the event. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041201. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/279.html 18:29 NNW - Faint loop front preceded by the development of an apparent system of faint loops. By 19:27 UT, an elongated feature develops at roughly the central PA of the loop front. As it develops, it shows up as a blob-like front. A similar one at 22:06 UT (a little bit fainter). ------------------------------------------------------------------------------------- 02-Dec-2004: ************ 01:27 WNW - Faint ragged front accompanied to N by a narrow front moving apparently a little bit faster. By 02:50 UT, on NNW, a couple of blob-like fronts start to be discerned. They all fade throughout C3. Gusty outflow follows on NNW in the form of small blobs all along the day (in particular some clearly discerned at: 03:06, 10:06, and 19:27 UT). 07:50 N - Very faint and raged front developing slightly toward NNE. It fades throughout C3. By 08:50 UT a very narrow loop-like feature (jet-like) is seen at roughly the PA of its southern leg. And by 09:26 UT another faint and ragged loop front can be seen above the N Pole. ------------------------------------------------------------------------------------- 03-Dec-2004: ************ 00:26 HALO - The event is first seen in C2 at 00:26 UT already surrounding the occulting disk. In particular, a brighter feature can be discerned developing above the N Pole - NE with faint extensions extending a little further out, and all the way through the western hemisphere, S Pole (most faint), and eastern hemisphere. The event is first seen in C3, all above the N Pole by 00:42 UT. The event looks extremely faint in the S - SE region of the C3 FOV during its whole development. The mean plane-of-sky speed of the LE of the outermost layers of the event at several PA is given below (based on C3 data, all cases showing practically no acceleration): PA 002: 937 km/sec; PA 076: 1074 km/sec; PA 267; 773 km/sec; PA 326: 1150 km/sec. GOES reported an M1.5 X-ray flare on NOAA AR 10708 (N08W02) between 23:44 (on Dec.02) - 00:35 UT with peak emission at 00:06 UT, which was clearly associated with the LASCO event. EIT 195 images show a strong brightening on NOAA AR 10708 just starting at 23:48 UT (on Dec.02), followed by a rather circular intensity disturbance traveling away from the AR, and a relative large dimming region to NW of the AR (and also to E). Nice post-flare loops. A filament previously 'winding' through the region cannot be seen any longer. In summary, the event has therefore been determined as a 'full' halo CME event, frontsided. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041203. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/280.html 13:50 SW - Small blob-like front. Difficult to give an exact time of first appearance. More later above W and NW limbs, all along the day. Also infalling material. 19:27 E - Small diffuse front that quickly fades. ------------------------------------------------------------------------------------- 04-Dec-2004: ************ W - Infalling material and some small blobs coming out all across the Western hemisphere all along the day. 00:06 SW - Very slow development of a faint system of loops along streamer. Difficult to give an exact time of first appearance. Early on next day, small blobs start to form along the streamer, continuing all along the day. 16:26 E - Very faint and elongated loop front. It fades in C3. ------------------------------------------------------------------------------------- 05-Dec-2004: ************ W - Infalling material and some small blobs coming out all across the Western hemisphere all along the day. Otherwise, MOSTLY QUIET. ------------------------------------------------------------------------------------- 06-Dec-2004: ************ W - Infalling material and some small blobs coming out all across the Western hemisphere all along the day. Otherwise, MOSTLY QUIET. 18:06 N - Extremely faint and diffuse elongated loop front that fades throughout C2. ------------------------------------------------------------------------------------- 07-Dec-2004: ************ W - Infalling material and some small blobs coming out all across the Western hemisphere all along the day. 01:50 ENE - Very faint and thin ragged loop front that fades throughout C2. 15:06 ESE - Faint brightening along streamer developing slowly. It fades throughout C2. 21:50 NNE - Very faint and ragged blob-like front that fades throughout C2. Difficult to give an exact time of first appearance. ------------------------------------------------------------------------------------- 08-Dec-2004: ************ W - Infalling material and some small blobs coming out all across the Western hemisphere all along the day. Otherwise, MOSTLY QUIET SUN until close to the end of the day when a Full Halo Event occurred. 05:26 SSE - Faint elongated and thin loop front followed at 06:50 UT a little bit to N by a faint jet-like front. 20:26 NW-SE - Brightenings above the NW and SE Limbs. The event develops as a (HALO) Full Halo CME by 21:26 UT (C2 occulting disk fully surrounded by that time). LASCO Data Gap afterwards (See Notes below). GOES reported a long duration X-ray event (C2.5) originating from NOAA AR 10709 (N01W07) between 19:34 - 20:44 UT with peak emission at 19:59 UT, associated to the event seen on LASCO. EIT 195 images show a brightening on the AR mentioned above starting at 19:36 UT. Post flare loops afterward. Relatively large dimming region to E and W of the AR. For completeness, also note that a second X-ray flare (C1.1) was reported, this time originating on NOAA AR 10710 (S09E49) on 2004/12/09 between 00:09 - 00:15 UT with peak emission at 00:10 UT. In summary, the event has therefore been determined as a potential 'full' halo CME, frontsided. See movies and images of the event at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20041208. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/281.html **** LASCO/EIT Data Gap on 2004/12/08 between 21:26 - 24:00 UT **** **** due to SPACECRAFT ESR (Cause currently unknown). **** **** Briefly: SOHO lost Telemetry at 21:58 UT, recovered in **** **** low rate at 22:12 UT. Spacecraft in ESR (Emergency Sun **** **** Reacquisition Mode) when telemetry recovered. As part of **** **** nominal recovery SOHO entered CRP mode (Coarse Roll **** **** Pointing) on 2004/12/09 at 04:44 UT. **** ------------------------------------------------------------------------------------ 09-Dec-2004: **** LASCO/EIT Data Gap on 2004/12/09. Recovery maneuvers. **** ************ ------------------------------------------------------------------------------------- 10-Dec-2004: **** LASCO Data Gap on 2004/12/10. EIT started obs at 00:48 UT. **** ************ ------------------------------------------------------------------------------------- 11-Dec-2004: **** LASCO Data Gap on 2004/12/11 between 00:00 - 15:54 UT. **** ************ **** No EIT data 2004/12/11 (15:24 UT) - 2004/12/28 (~ 10:00 UT). **** **** (EIT in CCD bakeout mode). **** 16:12 E - Diffuse and ragged loop front (fan-like) already under development after Data Gap that fades in C3. 21:24 W - Slow development of a very long jet-like feature (it looks like a very thin loop-like structure seen edge on). It fades in C3. 22:36 NW - Ragged and not well defined loop front that fades throughout C2. 23:24 ENE - Small blob-like front starts to be discerned already at a couple of solar radii above the limb. ------------------------------------------------------------------------------------- 12-Dec-2004: ************ 02:00 SW - Faint and diffuse elongated loop front. It fades close to the inner edge of the C3 FOV. 09:00 E - Faint and diffuse elongated loop front apparently preceeding a ragged and asymmetric (wider) structure. Some infalling material. The event fades throughout the C3 FOV, not too far from the inner edge. 11:48 SW - Extremely faint and diffuse elongated loop front that fades throughout C2. 14:12 SE - Faint and diffuse elongated loop front with some inner structure. It can be followed till almost the end of the C3 FOV. 21:24 NW - Big ragged loop front. By 22:00 UT, a ragged front on the W limb, at roughly the PA of the southern leg, can be discerned. Some twisted trailing material. Streamer to N pushed further to N in C3. ------------------------------------------------------------------------------------- 13-Dec-2004: **** Telemetry KEYHOLE # 7: 2004/12/13 to 2004/12/29. **** ************ 01:48 NW - Faint ragged loop front starts to be discernible in the trailing material of event reported to start at 21:24 UT on previous day. Another one above the NNW Limb. 23:36 E - Very faint, diffuse, and elongated loop front that fades throughout C2. ------------------------------------------------------------------------------------- 14-Dec-2004: - KEYHOLE - ************ 00:48 NE - Bright loop front with twisted core and twisted trailing material. Some infalling material can be seen later in the trailing material. In particular, 'pair formation' at ~ 10:12 UT (separation point at ~ 4.3 solar radii, PA ~ 72). 03:00 SW - 'Pair formation', 180 deg opposite to previous event. Separation point at ~ 4 solar radii (PA ~ 232). 10:48 NNE - Very faint loop front followed by another faint and asymmetric ragged front that seems to extend up to almost above the E Limb. ------------------------------------------------------------------------------------- 15-Dec-2004: - KEYHOLE - ************ SW - Small and faint blob-like fronts along streamer since late on previous day, all along the day. 06:12 W - Faint, elongated, and thin loop-like structure preceeding at ~ 08:24 UT another elongated and ragged structure. Also note that prior to the event, by ~ 04:36 UT, a jet-like front develops slightly toward WNW. 10:36 SE - Bright ragged loop front with structured interior. Some infalling material to N, during its development. 17:36 N-NW - The event was first seen in C2 at 17:36 UT above the NW limb as (HALO) well as on the N Pole. Extremely faint extensions above the S Pole and SW Limb can also be seen, giving to the event the appearance of a Full Halo. The development of the event shows a ragged loop- like structure moving out toward NW (1), a little behind a much wider (and fainter) ragged structure (2) that extends all above the W Limb, N Pole, and up to the SE Limb. The whole event was first seen in C3 at 18:42 UT all above the N Pole. Extensions to S are barely discernible. The mean plane-of-sky speed (based on C3 data) of the structure moving toward NW (1) measured at PA 311 was about 483 km/sec, showing practically no acceleration. As for the wide ragged structure (2), the speed at a couple of PA was: PA 315--> 524 km/sec; PA 000--> 516 km/sec (the corresponding HT profiles also show practically no acceleration). No significant X-ray activity was reported by GOES by the time. There were no EIT images as EIT is performing a CCD bakeout (2004/12/11-2004/12/28). In summary, and taking into account the very faint extensions to S, the event has therefore been determined as a 'full' halo event, most probably backsided. See movies and images of the event at (only C2 and C3): ftp://ares.nrl.navy.mil/pub/lasco/halo/20041215. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/282.html 18:48 WNW - In the aftermath of (1) -see previous event- a faint and ragged loop-like structure can be discerned. Very faint extensions to N. Another fainter structure follows by 20:24 UT. More structured material later. 20:48 ENE 'Pair formation' (couple of small blobs coming out and in, respectively). Separation point: ~ 4.35 solar radii at PA ~ 77. 23:24 W Elongated and expanding loop-like structure developing slightly toward WSW. Trailing material into next day. ------------------------------------------------------------------------------------- 16-Dec-2004: - KEYHOLE - ************ 04:24 SE - Elongated spray-like front. It superposes in the LOS with the slow evolution of a system of elongated and faint loops. 05:12 NW - Extremely faint ragged loop front that fades in C2. ------------------------------------------------------------------------------------- 17-Dec-2004: - KEYHOLE - ************ 14:48 NNW - Jet-like front. **** LASCO Data Gap between 15:36 - 20:12 UT. **** 20:24 NE - Slow development of a very faint system of loops. ------------------------------------------------------------------------------------- 18-Dec-2004: - KEYHOLE - ************ **** LASCO Data Gap between 02:36 - 09:36 UT. **** 09:48 NE - Faint loop front already under development after data gap (already close to the outer edge of C2). Also by that time a ragged front starts to be discerned at the northern leg of the loop followed by gusty outflow in the form of small blobs along streamer. 10:24 W - Bright loop front with twisted inner core. By 11:24 UT, faint and diffuse extensions can be seen above the N Pole. No significant X-ray activity was reported by GOES by the time. **** LASCO Data Gap between 13:48 - 22:00 UT. **** 23:24 W - Faint ragged front. ------------------------------------------------------------------------------------- 19-Dec-2004: - KEYHOLE - ************ **** LASCO Data Gap between 03:00 - 08:36 UT. **** 08:48 SE - Faint loop front (fainter to N) already under development after data gap. **** LASCO Data Gap between 09:36 - 20:12 UT. **** 20:24 NNE - Ragged fronts along streamer (gusty outflow) already under development after data gap, well into next day. Some infalling material to S. ------------------------------------------------------------------------------------- 20-Dec-2004: - KEYHOLE - ************ 00:36 NW - Jet-like front. 01:48 ESE - Faint and diffuse spray-like front. **** LASCO Data Gap between 04:36 - 08:36 UT. **** **** LASCO Data Gap between 09:48 - 14:48 UT. **** 14:48 E - Couple of big ragged loop fronts already under development after data gap. One is developing toward ESE, already close to the end of the C2 FOV, and the other, behind, toward E. **** LASCO Data Gap between 15:48 - 20:24 UT. **** **** LASCO closed doors at 21:00 UT in preparation to S/C **** **** maneuvers on 2004/12/21 (Station keeping, Momentum **** **** management, and 180 deg roll). It will reopen on **** **** 2004/12/23 at ~ 20:45 UT. **** ------------------------------------------------------------------------------------- 23-Dec-2004: - KEYHOLE - ************ **** First LASCO C2 image taken at 21:23 UT **** 22:12 ENE - Jet like front developing toward NE, followed by another one at 22:24 UT. ------------------------------------------------------------------------------------- 24-Dec-2004: - KEYHOLE - ************ **** LASCO Data Gap between 00:00 - 05:24 UT. **** 05:24 ESE - Big loop front. By 06:00 UT another bright loop front follows, jointly with an apparently different ragged structure to S. Development missed in the following data gap. C3 images show by 16:42 UT a wide CME spanning from ENE up to the S Pole with its LE almost at the outer edge of the FOV. It is difficult to say whether this signature corresponds to the continuation of the events described above or belongs to a separate event. Note that by that time, C2 shows the development of faint wide loop fronts developing mainly toward ENE and E (see event at 19:36 UT). 05:36 WNW - Big and bright loop front with bright inner core (very nice and clear prominence material). Development missed in the following data gap. **** LASCO Data Gap between 07:36 - 16:12 UT. **** 16:12 WSW - Loop front with apparently structured interior, already under development after data gap. 19:36 NE - Ragged and not well defined faint front that quickly fades. Difficult to say whether it is related to any of the features describes in entry at 05:24 UT. ------------------------------------------------------------------------------------- 25-Dec-2004: - KEYHOLE - ************ **** LASCO Data Gap between 00:00 - 05:24 UT. **** 07:24 E - Apparently wide and ragged loop front. Development missed in the following data gap. **** LASCO Data Gap between 08:24 - 20:00 UT. **** 20:48 SSE - Faint blob-like front, preceded by another one already under development after previous data gap. 22:12 NNW - Faint loop front preceded at 20:57 UT by a faint structure that seems to be pushed toward N. Outflow discerned toward N - NNE. ------------------------------------------------------------------------------------- 26-Dec-2004: - KEYHOLE - ************ 00:24 W - Bright ragged loop front and apparently twisted trailing material. Difficult to say whether it is associated with the event reported to start at 22:12 UT on previous day. Some infalling material can later be seen in the aftermath. 08:24 ESE - Diffuse jet-like front that fades throughout C2. 11:48 E - Thin, asymmetric, and diffuse loop front. It fades throughout C3. 13:12 WSW - Loop front that quickly fades. 17:00 SE - Faint jet-like front, slightly 'curved'. 18:12 S - Couple of faint blob-like fronts. Smaller ones can be discerned before, too, but it is difficult to precise the time of appearance. They all fade throughout C3. 19:12 SE - Diffuse loop front a little bit to N of the faint jet. It is followed at 19:36 UT by a very faint and asymmetric loop front. They both fade throughout C3. 23:36 E - Wide and ragged loop front that fades throughout C2. ------------------------------------------------------------------------------------- 27-Dec-2004: - KEYHOLE - ************ 07:12 SW - Initially bright and very narrow front immediately followed by a faint and diffuse ragged loop front. Similar couple of features follow starting at 08:36 UT. They all fade throughout C3. 14:24 W - Small front followed by faint ragged loop-like fronts on WSW at 15:12, 17:48, and 21:12 UT, all of them developing toward WSW. After the one at 21:12 UT, the slow development of a faint system of loops can be discerned to S (SW Limb). 23:12 SW - Ragged front partly superposed in the LOS with the slow development of a system of faint loops. ------------------------------------------------------------------------------------- 28-Dec-2004: - KEYHOLE - ************ 00:36 SW - Ragged asymmetric loop front. 01:48 SW - Another ragged asymmetric loop front. 02:48 E - Faint and diffuse loop front that fades throughout C3. 03:48 WSW - Small ragged front. 04:36 WSW - Not well defined front. 06:36 SW - Another ragged asymmetric loop front. 09:48 SW - Bright asymmetric and ragged loop front (brighter to S). 13:12 SW - Another bright ragged loop front, with a bright feature developing toward W. 16:12 SW - Another bright ragged front, much brighter to S. 18:12 E - Diffuse loop front [1] with extensions to N and S. After the following data gap, a bright and strong ragged loop front [2] can be seen developing in C2 with a structured (twisted) inner core. Some infalling material to S. By the time, GOES reported the following X-ray events on NOAA AR 10715: . a B4.7 (N05E77) between 16:38 - 16:53 UT, peak emission at 16:45 UT, . a C7.2 (N05E79) between 17:41 - 18:28 UT, peak emission at 18:01 UT (most probably associated to [1]), and . a C1.9 (N05E81) between 20:25 - 20:32 UT, peak emission at 20:29 UT (most probably associated to [2]). **** LASCO Data Gap between 19:24 - 21:04 UT. **** 21:04 WSW - Another ragged loop front. Start missed in previous data gap. NOTE: The multiple CMEs seen on WSW-SW along the day are associated with the X-ray activity, i.e., multiple C- and B- class X-ray flares, reported by GOES during the day on NOAA AR 10713 - by the time at around S10W70/80 - . ------------------------------------------------------------------------------------- 29-Dec-2004: - END of KEYHOLE - ************ 01:57 N - Very faint blob-like front preceded by a similar one (which is already close to the end of the C2 FOV). A couple more follow, developing toward NNW. 01:57 SW - Elongated and initially bright feature. Asymmetric and faint loop- like structure to N. 03:21 SW - Another elongated and initially bright feature that develops as an asymmetric loop front brighter to S. 06:21 SW - Another elongated and initially bright feature that develops as an asymmetric loop front brighter to S. 07:45 E - Initially bright ragged loop front that fades when the following event appears (see event at 08:45 UT). 08:45 E - Bright loop front with apparently twisted trailing material developing toward ESE. A very faint and diffuse loop-like feature (extensions?) moving toward ENE follows its development. 10:45 SW - Another elongated and initially bright feature that develops as an asymmetric loop front (fainter than the previous ones). Another one at 13:22 UT. At 16:21 UT, a spray-like front is immediately followed, a little bit to N, by a ragged loop front developing toward WSW. Another (smaller) spray front at 17:21 UT. By 19:45 UT, an asymmetric loop front follows, much brighter to S. Gusty outflow well into next day. Note that an M1.4 X-ray flare from 10713 (S12W90) was reported by GOES between 19:10 - 19:25 UT with peak emission at 19:20 UT. 16:45 E - Big, wide, and very bright loop front followed by gusty outflow at roughly the PA of its southern leg (ESE), well into next day. Some infalling material by the end of the day on ENE. GOES reported an M2.3 X-ray flare from NOAA AR 10715 (N04E62) between 15:57 - 16:38 UT with peak emission at 16:27 UT. NOTE: As on previous day, the multiple CMEs seen on WSW-SW along the day are most probably associated with the X-ray activity, i.e. multiple C- and B- class X-ray flares (and one M-class), reported by GOES during the day on NOAA AR 10713/10712 - by the time at around S10W90 - . ------------------------------------------------------------------------------------- 30-Dec-2004: ************ 00:21 ENE - Clear "pair formation" at PA ~ 67 (separation point at ~ 4 solar radii). 00:45 SW - Diffuse spray-like front. By the time, the slow development of a faint system of loops along the streamer starts to be discerned superposed in the LOS. 07:57 W - Faint elongated loop-like structure that fades very close to the inner edge of the C3 FOV. 10:57 E - Wide, big and very bright loop front. By 11:45 UT, extremely faint (HALO) extensions can be seen surrounding the C2 occulting disk. By 12:41 UT a new ragged front seem to develop in the trailing material toward ENE. Some infalling material later in the aftermath on E Limb. The event is first seen in C3 at 11:33 UT above the E Limb; by 12:33 UT extremely faint extensions seem to surround the C3 occulting disk. The mean plane-of-sky speed of the LE of the CME (based on C3 data) at PA 90 was ~ 1132 km/sec (showing practically no acceleration). GOES reported high X-ray activity during the day with a couple of M flares and multiple B- and C-class X-ray flares from NOAA AR 10715. In particular, it is worth to mention the following events, most likely associated with the C2/C3 signatures described above: . a C1.3 (N04E52) between 10:10 - 10:19 UT, peak emission at 10:17 UT, . a M2.2 (N03E53) between 10:33 - 11:28 UT, peak emission at 11:16 UT, . a C2.6 (N05E52) between 12:14 - 12:19 UT, peak emission at 12:17 UT. EIT 195 images show a strong brightening on the aforementioned AR starting at 10:39 UT (clear signature of the M2.2 flare). An intensity disturbance (wave) is seen developing afterward mainly toward W and SW of the AR. In summary, the event has therefore been determined as an extremely faint and asymmetric 'full' halo event, frontsided. See movies and images of the event at ftp://ares.nrl.navy.mil/pub/lasco/halo/20041230a. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/283.html 17:45 E - Loop front that fades and gives place to another loop (bubble-like) structure. It is surpassed by 23:30 UT in the C2 FOV by the following event. 22:30 E - Another wide, big, and very bright loop front. By 23:30 UT, faint (HALO) extensions can be seen surrounding the C2 occulting disk. By 00:54 UT on next day, a ragged (faint) front can be seen developing above the W Limb, with ragged extensions up to the S Pole, though it is difficult to establish its association with the event developing toward E. The event is first seen in C3 at 23:18 UT above the E Limb; by 23:42 UT faint extensions surround the C3 occulting disk. The mean plane-of-sky speed of the LE (based on C3 data) at PA 90 was ~ 1150 km/sec (showing practically no acceleration). As already mentioned, GOES reported high X-ray activity during the day with a couple of M flares and multiple B- and C- class X-ray flares from NOAA AR 10715. In particular, it is worth to mention the following events, very likely associated with the C2/C3 signatures described above: . a C4.1 (N03E46) between 21:41 - 21:56 UT, peak emission at 21:52 UT, . a M4.2 (N04E46) between 22:02 - 22:28 UT, peak emission at 22:18 UT, . a C1.2 (N03E47) between 00:30 - 00:54 UT (on 12/31), peak emission at 00:43 UT (on 12/31). EIT 195 images show a brightening on the aforementioned AR starting at 21:49 UT followed by a much stronger one at 22.12 UT. An intensity disturbance (wave) is seen developing by the time mainly toward N, S, and W of the AR. The ejection of a filament to NE, N, S, and W of the AR can be seen between ~ 22:24 - 22:36 UT. In summary, the event has therefore been determined as an asymmetric 'full' halo event, frontsided. See movies and images of the event at ftp://ares.nrl.navy.mil/pub/lasco/halo/20041230b. See also: http://lasco-www.nrl.navy.mil/mail/halo_mail/284.html ------------------------------------------------------------------------------------- 31-Dec-2004: ************ 07:31 E - Diffuse loop front discernible in the aftermath of halo event reported to start at 22:30 UT on previous day. Much outflow all across the eastern limb. 15:30 E - Big CME spanning in C2 all above the E Limb (as projected on the plane of the sky) without clear extensions as in the two Halo events on previous day. By 16:54 UT, C2 shows a ragged front just appearing above the N Pole that spans later all above the W Limb (it is difficult to say whether it is related to the huge CME on E mentioned above). As for C3, this latter front fades close to the inner edge. On 2004/12/31, among multiple B- and C-class X-ray flares, GOES reported an M1.2 X-ray flare (N04E38) between 14:38 - 14:48 UT, with peak emission at 14:45 UT, followed by a C6.8 (N03E38) between 14:52 and 15:04 UT with peak emission at 14:59 UT. EIT 195 images show a brightening on the aforementioned AR starting at 14:48 UT, clear signature of the M 1.2 X-ray flare. An intensity disturbance (wave) can be seen developing afterward mainly toward NW, W, S, and SE of the AR, and by ~ 15:00 UT, a dimming region mainly to SW and S of the AR. 21:54 SW - Ragged loop front. =====================================================================================