LASCO Activity Report for
January 22, 2007 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

2007/01/19 (Friday)

04:30 UT  E Limb	Full Halo Event. First seen as a very bright loop 
			front on the E Limb with diffuse extensions that
 			surround completely the C2 occulting disk by the 
			time of first appearance (04:30 UT). The bulk of 
			the CME (i.e., the brighter part of the front) develop
 			toward E as projected onto the plane of the sky, while
 			the diffuse extensions expand simetrically all around
 			the occculting disk. The event was first seen in C3 at
 			05:18 UT, all above the E Limb. The diffuse extensions
 			start to be seen on W by 05:18 UT, and by 06:18 UT the
 			C3 occulting disk appears fully surrounded (signal on 
			N barely above the occulting disk). The mean plane-
			of-sky speed at PA ~90 deg amounts ~ 570 km/sec, while
 			at PA ~260 deg the mean plane-of-sky speed is about 
			~620 km/sec (LE very diffuse and faint). Both
 			determinations were based on C3 data, and the
			height-time profile shows practically no acceleration).
			GOES recorded no significant X-ray activity prior and
 			during the LASCO event (A-level). EIT 195 running
 			difference images show, by around 04:36 UT above the 
			ENE Limb, what appears to be very faint signatures of 
			a backsided CME. No significant activity on the disk.
			In summary, the event has therefore been determined 
			as a full halo event, most likely backsided.

	12:00 - 18:00 UT	NO LASCO CME watch program due to special
				C2 observation program (polar coronal hole/
				plumes study in the SOUTH: orange filter at
				100 sec exposure with a 5 minute cadence of
				the lower part of the FOV -1024x416-).


	  E Limb	Gusty outflow already under development on East limb
			well into next day.

2007/01/20 (Saturday)

	  E Limb	Gusty outflow all along the day.

	12:00 - 18:00 UT	NO LASCO CME watch program due to special
				C2 observation program (polar coronal hole/
				plumes study in the SOUTH: orange filter at
				100 sec exposure with a 5 minute cadence of
				the lower part of the FOV -1024x416-).

20:30 UT  E Limb	Ragged front.

2007/01/21 (Sunday)

05:30 UT  E Limb	Ragged  front.

06:30 UT  S West	Diffuse and very thin elongated loop (jet-like front).

09:30 UT  EN east	Diffuse and ragged front.

	12:00 - 18:00 UT	NO LASCO CME watch program due to special
				C2 observation program (polar coronal hole/
				plumes study in the SOUTH: orange filter at
				100 sec exposure with a 5 minute cadence of
				the lower part of the FOV -1024x416-).

23:54 UT  EN East	Diffuse and ragged loop front. Faint extensions 
			toward S.

2007/01/22 (Monday)

04:54 UT  E Limb	Diffuse front that quickly fades.

Last C2 image available by the time of writing: 11:06 UT.