LASCO Activity Report for
January 6, 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

2005/01/05 (Wednesday)

05:54 UT  N West	Brightening along streamer (with extremely faint
 			and diffuse extensions to both sides),followed by a 
			wide and diffuse front above the W Limb at 06:30 UT. 
			By 12:06 UT, the whole event spans in the C2 FOV 
			from about PA 210 - 030. C3 images show a diffuse and
			faint front above the W Limb starting at 08:42 UT. 
			The event clearly spans over the N Pole by 12:42 UT. 
			A rough estimation (LE very diffuse an faint) of its 
			mean plane-of-sky speed (based on C3 data) at PA 282 
			is ~ 300 km/sec (showing practically no acceleration).
			GOES reported a B8.4 X-ray flare on NOAA AR 10715
			(N08W25) between 04:04 - 06:00 UT with peak emission 
			at 05:27 UT, most probably associated with the event
			observed by LASCO. EIT 195 observes a filament channel
			activation on AR 10715 and a dimming region to W, SW, 
			and S of the AR between around 04:00 - 05:48 UT
			(development of a CME coming out from nearby the AR). 
			In summary, the event has therefore been determined 
			as a very faint (at least) 'partial' halo event, most
			probably frontsided. 

	14:00 - 15:30 UT	LASCO Data Gap 
				(ICAL 01 - Intercalibration EIT/CDS)

15:30 UT  E Limb	Diffuse expanding loop-like front followed by core
			material. By around 16:54 UT the C2 occulting disk 
			seems to be completely covered. The event is first 
			seen in C3 at 16:18 UT above the E Limb. By 18:18 UT 
			the C3 occulting disk is completely covered. The mean
		 	plane-of-sky speed of the LE at PA 86 was about 
			725 km/sec (slightly accelerated). EIT 195 images 
			show a big filament on the NE quadrant that begins to
 			erupt, at the beginning very slowly, by around 
			13:13 UT. The last EIT 195 image prior to the 195 
			data gap (due to ICAL01) was taken at 13:48 UT, the
			filament still on the disk. At 15:24 UT, first image 
			after the data gap, the filament is already gone, 
			nice and big post-event arcades starting to develop. 
			GOES reported a relative increase in the X-ray flux 
			at around 15:00 UT (almost B1). In summary, the event 
			has therefore been determined as an asymmetric 'full'
			halo event, frontsided. 

23:06 UT  EN East	Very faint asymmetric loop front.

2005/01/06 (Thursday)

	02:06 - Present (13:30 UT)	Temporary Data Gap.