SOHO KEYHOLE #10 telemetry period: Aug 31-Sep 28, 2005. EIT CCD bakeout between Sep 2 23:00 UT - Sept 23 10:00 UT with its mini-cal pre and post sets as folows: 2005/09/02 19:00:00 - 2005/09/03 01:00:00 2005/09/23 20:00:00 - 2005/09/24 00:20:00 During the Telemetry Keyhole LASCO will be in improved synoptic cadence of C2 at 12 mins cadence and C3 at 30 mins cadence, including daily orange/blue filter fielding images.
13:12 UT N East Faint and asymetric loop front. 20:00 UT S East Bright loop front all above the SE Limb, preceded by a faint and diffuse envelope. By 20:12 UT, faint extensions are seen all around the main loop structure; a second ragged front seems to come behind the first loop front. The C2 occulting disk is fully surrounded by 20:36 UT by the diffuse extensions, the LE on SE being already past the end of the C2 FOV. By this time, the existence of apparently two consecutive fronts becomes clearer. Much gusty outflow follows on the S Pole. There is a C2 data gap between 23:36 - 03:24 UT due to a telemetry data gap (not recovered yet). The event is first seen in C3 at 20:18 UT all above the SE Limb. The C3 occulting disk is fully covered by 21:18 UT (signal on NW just above the limb, while on SE the LE is already at 16 solar radii). The mean plane-of-sky speed of the outermost front of the diffuse envelope at PA 145 was ~ 1865 km/sec, while the speed of the LE of the bright loop-like structure at PA 151 was 1680 km/sec. The C3 frame at 23:18 UT is the last one available showing the event. The first C3 image after the telemetry data gap apparently shows no more signatures of the event. GOES recorded a long-duration X-ray event on NOAA AR 10808. First, a complex (two peaks) X-ray flare (on about S09E10) between 19:19 - 20:57 UT with peak emission at 19:27 UT (X1.5) and 20:04 UT (X1.4). And then, an X1.7 X-ray flare (on about S10E03) between 23:15 - 23:30 UT with peak emission at 23:22 UT. Due to the EIT CCD bakeout, there were no EIT images. In summary, the event has therefore been determined as a strong and complex asymmetric Full Halo Event, frontsided, associated to a triple X-ray flare from NOAA AR 10808.
00:00 - 03:24 UT Temporary Data Gap. S Pole Much gusty outflow. Last C2 image under analysis: 05:24 UT