KEYHOLE Operations: ------------------- 26 m keyhole: 2007/05/18 - 2007/06/05 34 m keyhole: 2007/05/21 - 2007/06/01 While in Keyhole, improved cadence in LASCO C2 (12 min) and LASCO C3 (30 mins). EIT CCD bakeout ends on 2007/05/24. EIT CCD Bakeout as originally planned: started on 2007/05/18 @ ~15:00 UT and ends on 2007/06/05. Spacecraft Maneuvers on Tuesday 2007/05/29. (Station Keeping, Momentum Management, and 180 deg Roll. LASCO will safe on 2007/05/28 @~ 12:00 UT and will recover on 2007/05/30 @~ 23:00 UT.
00:00 - 12:36 UT LASCO Data Gap (C2 time). 16:12 UT S West Very diffuse and faint expanding front developing slowly develops as a Faint Partial Halo Event. Due to its faintness and slow gradual nature it is difficult to give an exact time of first appearance. Due to the Keyhole Operations there is a Data Gap between 18:12 - 23:14 UT (C2 time) and therefore, the development of part of the event in C2 is missed (LE at about 4.1 solar radii by 18:12 UT). The event was first seen in C3 on 2007/05/24 at 23:18 UT all above the SW limb. The angular width by 01:18 UT (on 05/25) is about 170 deg (from about PA 150 - 320). Last available C3 frame by the time of writing: 03:42 UT. By that time, the event is practically no longer discernible (LE at about 15 solar radii - at PA 270-). The mean plane-of-sky speed of the LE at PA 264 was ~ 265 km/sec, showing a slight acceleration (based on only 5 C3 frames). GOES recorded no significant X-ray activity during 05/24 (practically below the A level). NO EIT images are availble. In summary, the event has been determined as a very faint, at least Partial Halo Event. It was not associated to significant X-ray activity. The morphology of the event in C2 would seem to indicate that the event is associated with a prominence eruption. With the data at hand I cannot be certain whether the event was front- or backsided. 18:12 - 23:14 UT LASCO Data Gap (C2 time).
01:36 UT ES East Diffuse jet-like front. Last C2 image available by the time of writing: 03:48 UT