Medoc Campaign started on May 16. May 12-14: IPS Measurements. During the IPS study, EIT will have regular synoptics along with half resolution 195 CME watch. On 2005/05/03 @ 19:06 UT SOHO Telemetry Submode changed to Submode 6. It will be in Submode 6 until 2005/05/16 @ 12:00 UT. During that time, EIT 195 CME watch at full resolution (1024x1024).
04:52 - 09:52 UT NO LASCO C2 Data due to IPS "C3 only" timeframe. 17:22 UT HALO Nice and bright full halo event. The event was first seen in C2 at 17:22 UT already half way to the end of the C2 FOV and completely surrounding the C2 occulting. The event looks brighter all above the NE Limb. Unfortunately, the LASCO Electronic Box (LEB) failed afterward, and therefore there are no more C2 images until 23:22 UT. For the same reason, there is a C3 data gap between 17:50 and 22:50 UT, and an EIT 195 data gap between 17:37 and 22:57 UT. The event was first seen in C3 at 17:42 UT already as a very symmetric and bright halo. Next C3 frame available was taken at 23:12 UT. By that time, the halo event is no longer visible in the C3 FOV. A rough estimation of the mean plane-of-sky speed (rough because it was determined with the only 2 frames where the halo was seen) is as follows (LE defined as the position where the intensity gradient is maximum): - PA 000: ~ 794 km/sec - PA 090: ~ 1020 km/sec - PA 180: ~ 927 km/sec - PA 270: ~ 915 km/sec A diffuse front can be seen over the North and South Poles ahead of the main structure of the event. If the LE is considered as the outermost part of this diffuse front, the mean plane-of sky speed is: - PA 000: 1645 km/sec - PA 180: 1640 km/sec GOES reported a long duration M8.0 X-ray flare on NOAA AR 10759 (N12E11) between 16:13 - 17:28 UT with peak emission at 16:57 UT. Associated proton event. The >10 MeV proton flux exceeded the event threshold around 06:00 UT this morning. EIT 195 images show a strong brightening that starts to develop by 16:37 UT. A dimming region develops to SW and NE of the AR. Also a an important and symmetric EIT wave with epicenter on the AR develops. In summary, the event has therefore been determined as a fast and strong Full Halo CME, frontsided, associated with a LDE M-class X-ray event on NOAA AR 10759. 17:50 - 22:50 UT Non-recoverable LASCO Data Gap (C2 times) due to LEB (LASCO Electronic Box) crash.
04:52 - 09:52 UT NO LASCO C2 Data due to IPS "C3 only" timeframe. 10:22 UT N West Faint elongated and expanding loop front already under development after data gap. It fades throughout C3. By 18:22 UT a diffuse fan-like front follows. 10:52 UT N East Faint elongated and expanding loop front. By 17:52 UT a spray-like front follows. It is difficult to say whether this event is an independent event or part of the event reported in previous entry. 20:56 UT WS West Bright and big ragged loop front with apparently twisted interior. Faint extensions to N. Early on next day, C2 images show an increase of the proton storm (>10 MeV) under development since LDE M-class X-ray event and halo on 2005/05/13. By 06:06 UT on next day, the proton storm signature in C2 subsides. EIT 195 images show bright ejecta toward SW from nearby AR 10758 by 20:37 UT. The CME extends to SSW by 21:10 UT. GOES reported a C2.8 X-ray flare form NOAA AR 10758 between 20:18 - 22:36 UT with peak emission at 20:58 UT. NOTE: NOAA AR 10758 produced other several C-class X ray flares during the day: - C1.1 peaking at 13:26 UT (S10W90) - C4.0 peaking at 15:06 UT (S09W90) - C3.5 peaking at 15:57 UT (S10W90)
NOTE: NOAA AR 10758 continue producing C class events until dissapearing behind the limb. Last C-class event from 10758 peaking at 09:42 UT 10:26 UT S West Ragged front along streamer. By the time, a kind of reconexion event develops a little bit to N. A ragged loop with the front looking like a ragged blob follows by 13:26 UT. Infalling material on W. 21:50 UT NN West Slow development of a system of loops. It is difficult to give an exact time of first appearance. 23:26 UT S Pole Extremely faint and diffuse wide loop front. It fades throughout C2. GOES reported a M3.5 X-ray flare from NOAA Ar 10763 (S16E15) between 22:27 - 22:42 UT with peak emission at 22:36 UT. EIT 195 shows a wave, and a dimming region to S, WNW, and W of the AR. A C2.1 X-ray flare follows from the same Ar (S16E20) between 23:46 - 00:29 (+1) UT with peak emission at 00:03 UT (on May 16). NOTE: Please note that 10763 produced another four C-class X-ray flares earlier in the day (if any signature of C2 events associated to them, too faint to be discernible).
03:26 UT S Pole Another extremely faint (barely discernible) and diffuse loop front. Brightening on SE that could be part of. Nothing can be discerned in C3. GOES reported an M1.4 X-ray flare from NOAA AR 10763 (S16E18) between 02:33 - 02:50 UT with peak emission at 02:43 UT. EIT 195 shows a loop brightening at the center of the AR by 02:48 UT. Loops to S of the AR disappear.