LASCO Activity Report for
January 31, 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

2005/01/28 (Friday)

00:54 UT  WS West	Following the series of similar events on previous day, 
			another initially small loop front that develops as 
			a faint and ragged front.

06:54 UT  W Limb	Faint and diffuse loop front followed at 07:54 UT
			by another one, elongated, that fades throughout C3. 

09:30 UT  N West	Faint and elongated loop-like structure that fades 
			in C3. Infalling material.

11:54 UT  WS West	Ragged loop front. By 12:30 UT, an initially bright
			(small) structure follows a little bit to S (along
			streamer).It fades throughout C3. Afterward (~ 15:30 
			UT), the slow development of a faint system of loops
			along the streamer starts to be discerned (on SW).

20:54 UT  E Limb	Jet-like front.

2005/01/29 (Saturday)

	  S West	The expansion of the faint system of loops along
			streamer continues on SW.

03:54 UT  N Pole	Faint blob like front starts to be discerned already 
			half way to the end of C2 FOV, developing slightly 
			toward NNW.

04:30 UT  N West	Diffuse amd ragged loop front. Faint extensions on W 
			and SW, making momentarily brighter the system of loops
			on the streamer on SW.
			
10:34 UT  W Limb	Elongated and narrow loop-like structure with a diffuse
			front.

13:54 UT  W Limb	Another elongated and narrow loop-like structure with 
			a diffuse front.

	16:06 - 18:30 UT	Data Gap.

18:30 UT  W Limb	Spray-like front already under development after
			data gap.

2005/01/30 (Sunday)

15:54 UT  S West	Wide expanding loop front, though a slight excess
			intensity can be guessed already at 15:30 UT. Relative
			narrow ragged fronts follow on SW, then gusty outflow.
			By 16:54 UT, a diffuse and expanding front can be 
			seen on the E Limb. Difficult to establish its
			association to the loop developing toward SW.  
			By 18:54 UT the legs of the loop seem to be at PA ~095
			and PA ~270, giving to the event an apparent angular 
			span of around 175 deg (C2). However, extremely diffuse
			and faint extensions could be guessed above the NE 
			Limb, and barely on the N Pole. The event was first 
			seen in C3 at 17:18 UT on SW, preceded by diffuse and
			faint extensions above the W Limb. No signatures of 
			the event can be discerned above the N Pole (if any, 
			too faint). The mean plane-of-sky speed (based on C3
			data) of the LE at PA 220 was around 445 km/sec. The 
			HT profile shows a slight acceleration. No significant
			X-ray activity was reported by GOES by the time.
			Likewise, EIT 195 shows a quiet Sun, with no activity
			that could be related to the event observed by LASCO. 
			In summary, and taking into account the lack of
			signatures above the N Pole on C3, and the lack of
			frontsided activity in EIT (as well as X-ray activity),
			the event has therefore been determined as a Partial 
			Halo event, most probably backsided.

2005/01/31 (Monday)

	06:54 - 09:06 UT 	Temporary Data Gap.

09:06 UT  S East	Big CME already well under development after data gap
			(LE already out of C2 FOV). Gusty outflow.