LASCO Activity Report for
September 14, 2005 SOHO Science Daily Meeting

Event times are first frame seen in C2 camera unless otherwise noted.
These are preliminary observations for the daily SOHO science discussions.
Final analysis is reported on the Lasco CME list.
An archive of these reports is available.

Points Of Interest

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.

2005/09/13 (Tuesday)

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.

2005/09/14 (Wednesday)

	00:00 - 03:24 UT	Temporary Data Gap.

	  S Pole	Much gusty outflow.

Last C2 image under analysis: 05:24 UT