LASCO Activity Report for
October 21, 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

2004/10/20 (Wednesday)

03:30 UT  S West	Extremely faint 'half-loop' front. It fades in C2. GOES
			reported a C4.5 X-ray flare from NOAA AR 0682 (S13W23)
			between 02:09 - 02:16 UT with peak emission at 02:13 UT.

06:30 UT  W Limb	Small, not well defined loop front that fades in C2.	

07:31 UT  N East	Diffuse and ragged loop front. It fades close to the 
			inner edge of C3.	

08:30 UT  EN East	Faint and elongated front, later surpassed by following
			event.

11:06 UT  EN East	Bright ragged loop front and trailing material. Faint
			extensions on SE by 12:54 UT. Couple of faint ragged
			loop fronts on E a ENE starting at 15:30 UT and later
			that fade throughout C3.
			GOES reported an M2.6 X-ray flare from NOAA AR 0687 
			(N11E68) between 10:43 - 10:56 UT with peak emission 
			at 10:51 UT.	     

12:06 UT  W Limb	Faint not well defined front that fades throughout C2.	

17:54 UT  E Limb	Ragged loop front. It fades throughout C3.

22:30 UT  EN East	Initially bright, explosive ragged loop front, later
			surpassed by following event.	 

2004/10/21 (Thursday)

00:54 UT  EN East	Bright ragged loop front followed:
		     i) at 02:30 UT, a little bit to S by another bright loop 
			front (narrower),
		    ii) at 05:30 UT, at roughly the same PA as the one at 02:30,
			by another similar front, which in turn it was preceded 
			at 04:30 UT by a fainter and elongated ragged front.
		   iii) at 07:31 UT by a wider (like the first one) bright 
			ragged loop front and trailing material.
			By the time, GOES reported several C class X-ray 
			flares from NOAA AR 0687:
		      - a C7.8 X-ray flare (N11E60) between 00:18 - 00:52 UT
			with peak emission at 00:40 UT,	
		      - a C4.3 X-ray flare (N11E62) between 02:10 - 02:18 UT
			with peak emission at 02:15 UT,	 
		      - a B4.9 X-ray flare (N09E57) between 04:00 - 04:11 UT
			with peak emission at 04:08 UT,	  
		      - a C2.0 X-ray flare (N09E57) between 05:05 - 05:15 UT
			with peak emission at 05:12 UT.

07:31 UT  WS West	Faint ragged loop front.      

	Last C2 image analyzed taken at 09:06 UT