LASCO Activity Report for
November 10, 2004 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 in Telemetry Submode 5 since 2004/11/08 @ 22:15 UT. While in Submode 5, 
half resolution EIT 195 CME watch (512x512).

2004/11/09 (Tuesday)

	
01:27 UT  WN West	Ragged loop front followed by an elongated ragged loop
			front a little bit to S (at 02:50 UT). By 05:06 UT
			another ragged front follows. Infalling material on 
			W Limb. They all fade throughout C3. 

09:26 UT  ES East	Bright ragged loop front and trailing material.

17:26 UT  W - N West	Very bright and wide loop front. By 17:50 UT, the LE
	  Asymmetric	already exited the C2 FOV (the event develops mainly
	     Halo	toward NW). Faint extensions (shock?) up to NE. The C2
			occultor is completely surrounded by the faint 
			extensions by 18:26 UT, though on SE the excess 
			intensity is just above the occulter. C3 images show 
			the event starting at 17:48 UT, on NW. By 18:18 UT, 
			the C3 occultor is completely covered, the event having
			the appearance of a very asymmetric 'full' halo event.
			Please note that the 'bulk' of the mass, that is, the
			loop front itself only spans from PA 215 - 360 (at 18:42
			UT, measured in C3). For reference, the mean plane-of-
			sky speed of the outermost layer of the 'halo' at 
			several PA was: i) PA 297: 1853 km/sec, ii) PA 004: 
			967 km/sec, and iii) PA 224: 1236 km/sec.
			EIT 195 images show a strong brightening on NOAA AR 
			10696 starting at ~17:12 UT, and followed by an 
			intensity disturbance developing across the Sun's 
			surface with epicenter in the AR. On the other hand, 
			GOES recorded a M8.9 X-ray flare from NOAA AR 10696
			(N08W51) between 16:59 - 17:32 UT with peak emission at
			17:19 UT, most likely associated to the halo event. 
			In summary, the event has therefore been determined as 
			an asymmetric 'full' halo CME, frontsided. Much gusty
			outflow follows

18:50 UT  S East	Bright ragged loop front starting to develop toward SE.
			An structured feature follows developing very slowly.
			The bright ragged loop is associated to activity on the
			SE Limb, as can be seen in the EIT 195 images starting 
			at 17:36 UT (Limb CME signature).

2004/11/10 (Wednesday)

	
02:26 UT  WN West 	Very bright and wide loop front, pretty fast. By 
	 Asymmetric	02:50 UT, the LE already exited the C2 FOV (the event
	    Halo	develops mainly toward NW). A proton storm starts
			developing by the time. Faint extensions (shock?) up 
			to NE. The C2 occultor is completely surrounded by 
			the faint extensions by 03:06 UT, though on SE the 
			excess intensity is just above the occulter. C3 images
			show the event starting at 02:42 UT developing toward 
			NW. By 03:42 UT, the C3 occultor is completely covered
			(as in C2, the excess intensity on SE barely above the
			occulter), the event having the appearance of a very
			asymmetric 'full' halo event. Please note that the 
			'bulk' of the mass, that is, the loop front itself only
			spans from PA 215 - 010 (at 03:42 UT, measured in C3).
			For reference, the mean plane-of-sky speed of the
			outermost layer of the 'halo' at several PA is given
			(based on C3 data; the height-time plots show 
			practically no acceleration): i) PA 305: 2900 km/sec (*),
	 		ii) PA 002: 1975 km/sec, and  iii) PA 221: 1477 km/sec.
			(*) The error is big as the outermost part becomes very
			diffuse. Just for completeness, if taken as LE the
			brightest part of the LE of the front at PA 305, the 
			mean plane-of-sky speed becomes almost 2000 km/sec,
			pretty much alike the one at PA 002.
			GOES recorded an X2.5 X-ray flare from NOAA AR 10696
			(N09W49) between 01:59 - 02:20 UT with peak emission at
			02:13 UT, associated to the halo event. On the other
			hand, EIT 195 images show an extremely strong 
			brightening on NOAA AR 10696 starting at ~02:12 UT, 
			and followed by an intensity disturbance developing
			across the Sun's surface with epicenter in the AR.
			Release of a huge amount of material from a big 
			extension on the Earth-side face of the Sun can be
			guessed also from the EIT images. In summary, the event
			has therefore been determined as an asymmetric 'full'
			halo CME, frontsided. Much gusty outflow on NW.