Medoc Campaign started on May 16. Since then SOHO is in Telemetry submode 5. EIT 195 CME watch at half resolution (512x512).
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. 06:06 UT E Limb Extremely faint slowly-expanding system of loops spanning all above the north eastern limb, up to the N Pole. Also too faint in C3, fading close to its inner edge. 10:50 UT E Limb Faint and diffuse fan-like front. It fades throughout C2. 13:50 UT N West Bright front above the NW limb. By 14:26 UT, a wide and diffuse loop front starts to be visible on NNW, partly superposed in the LOS with the former bright front. The whole event (hereafter Event #1) expands as it develops. Note that by 14:50 UT, a bright front starts to be seen on WSW (hereafter Event#2). The development of Event #2 seems to be affected by the expansion of Event #1. Infalling material can be seen afterward on WSW. The Event #1 (in fact, the event which could be potentially geoeffective) was first seen in C3 at 15:18 UT above the NW Limb. The diffuse front on NNW mentioned at the beginning makes its appearance at 15:42 UT on NNW. The mean plane-of-sky speed of the LE of Event #1 at PA 311 was ~ 390 km/sec (based on C3 data). The event spans in C3, at 21:18 UT, ~ 120 deg (form PA 280 - 040), though it is difficult to give an accurate value due to its faintness. GOES reported a C1.2 X-ray flare from NOAA AR 10759 (N15W27) between 12:46 - 13:12 UT with peak emission at 13:01 UT. EIT 195 images show the ejection of material toward NE of the AR by 12:36 UT. An intensity disturbance traveling away from the AR toward NE, N, and NW can be seen afterward (all signatures most likely related to Event #1). By 13:48 UT, the open up of a system of loops on WSW (barely backsided) starts to develop (EIT counterpart of Event #2). In summary, the event (Event #1) has therefore been determined as a partial halo CME, frontsided, associated with a C-class X-ray flare on NOAA AR 10759. 14:50 UT WS West Initially bright ragged front. Development seems to be affected by the expansion of event at 13:50 UT. Infalling material (see Event at 13:50 UT). 20:50 UT NN West Faint expanding loop front. It fades throughout C3.
03:06 UT WS West Initially bright ragged front. The event fades close to the inner edge of C3. EIT 195 images show ejection of material on the WSW Limb from barely behind the disk between 02:24 - 03:36 UT. 03:50 UT HALO Extremely faint and diffuse brightening all around the occulting disk (though not very clear at this time). Please note that since 03:06 UT an (initially) bright ragged front was seen above the WSW Limb, fading out then close to the inner edge of C3. This particular feature corresponds to ejection of material seen by EIT 195 on the WSW Limb from barely behind the disk between 02:24 - 03:36 UT and should not be confused with the main event. Coming back to the halo event... the event in itself is so faint that is barely discernible in C3, where one can say that it is first discerned at around 08:18 UT. A very rough estimation of the mean plane-of-sky speed of the LE of the event based on C2 data (where at least it is possible to measure something) is ~ 300 km/sec (at PA 211). GOES reported an M1.8 X-ray flare from NOAA AR 10763 (S15W00) between 02:31 - 02:52 UT with peak emission at 02:39 UT. EIT 195 images show a strong brightening at 02:36 UT on the aforementioned AR. A clear wave is seen then developing toward N, W, S, and SE of the AR between 02:48 - 03:36 UT. Also a dimming region to N and S of the AR. The AR continued flaring afterward (at the time of writing: a C8.4 peaking at 04:03 UT, and a C2.8 peaking at 05:53 UT). In summary, the event has therefore been determined as a very faint Full Halo CME, frontsided, associated with an M-class X-ray flare on NOAA AR 10763. 07:27 UT ES East Small loop front along streamer. It fades throughout C2.