LASCO Activity Report for
January 25, 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

2007/01/24 (Wednesday)

00:30 UT  EN East	Initially bright ragged loop front that fades close to
			the inner edge of C3.

01:54 UT  W Limb	See event at 22:30 UT on previous day.

02:54 UT  NN East	Jet-like front.

04:30 UT  EN East	Bright ragged front. Trailing material. It fades
 			throughout C3.

05:54 UT  W Limb	Ragged loop front. It fades close to the inner edge 
			of C3.

	10:40 - 13:30 UT	EIT shutterless (NO EIT CME watch).	

14:23 UT  E Limb	Wide and very bright loop front. By 16:30 UT, faint 
			and diffuse extensions suuround the C2 occulting
			disk (very asymmetrically, LE on E already well past 
			the outer edge of C2). Gusty outflow afterward all 
			above the E. The event was first seen in C3 at 14:42 UT
 			barely above the E Limb. The extensions, extremely
 			faint, seem to surround the C3 occulting disk by 
			20:18 UT, the LE on E being almodst at the outer edge 
			of C3. GOES reported a B9.0 X-ray event on S08E79
 			between 13:45 - 16:08 UT with peak emission at 
			14:52 UT. By 14:18 UT, EIT 195 images show signatures
 			all above the E Limb of a strong barely backsided CME,
 			accompanied by a strong wave signature that can be 
			seen propagating to the front side (in particular in 
			the northern hemisphere).

2007/01/25 (Thursday)

06:54 UT  E Limb	Wide and very bright loop front. By 08:30 UT, faint
			and diffuse extensions surround the C2 occulting disk
			(LE on E already well past the outer edge of C2). Much
			gusty outflow afterward on E. The event was first seen
			in C3 at 07:42 UT, all above the E limb with shock
			signatures to N and S, which seems to surround the
			C3 occulting disk by 08:42, though the signal on the 
			western hemishere is extremely faint to be certain.
			By 09:42 UT, the C3 occulting disk appears indeed 
			surrounded and from there on the event looks as a whole 
			as a very asymmetric halo. The mean plane-of-sky speed
			of the LE of the event at PA ~ 90 deg was 1260 km/sec
			showing a decelerated profile - based on a second 
			order fit, we obtained speed > 1500/km/sec below 10
 			solar radii and around 1000 km/sec at ~21 solar radii - 
			(based on C3 data). GOES observed a C6.3 X-ray event
			on S08E90 between 06:33 - 07:58 UT with peak emission
			at 07:14 UT. EIT 195 images show signatures of a CME
 			above the E limb (barely backsided) starting at 
			05:48 UT. A strong wave signature can be seen
 			propagating toward the front side by 06:48 UT,
 			developing afterward all across the eastern hemisphere.
			Nice post-flare loops on E start to be seen by around
 			08:00 UT. The event has therefore been determined as 
			a strong limb event barely backsided that produced 
			at least an asymmetric halo signature, frontsided.
 			Hence, the flank of the event is likely to travel 
			toward earth.

Last C2 image available by the time of writing:  15:54 UT.