LASCO Activity Report for
January 5, 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

2005/01/04 (Tuesday)

09:30 UT  WN West	Brigh loop front with inner core exhibiting faint
			extensions to N and S. EIT 195 images show a prominence
			lift-off starting at around 08:36 UT, very close to 
			the W Limb. Big and clear Limb CME signatures. Mean 
			plane of-sky-speed based on C3 data at PA 293 was 
			around 1000 km/sec (slightly decelerated).

10:54 UT  W Limb	Very faint and diffuse front above the W Limb. By 
			By 12:54 UT a diffuse front is seen apparently covering
			the C2 occulting disk. It is really difficult to
			distinguish its faint signatures in the C2 FOV due to a
			previous big limb CME on WNW Limb, (see event reported 
			to start at 09:30 UT).
			Coming back to the faint Event, it was first seen in 
			C3 at 11:42 in the western hemisphere, in the aftermath
			of previous limb event, though it is difficult to be
			certain due to its extreme faintness. A very rough and
			crude estimation of its mean plane-of-sky speed (based 
			on C3 data) at PA 260 is ~ 460 km/sec (showing
			practically no acceleration). The error in the 
			estimation is big as it is practically impossible to 
			define the position of the LE.
			GOES reported several C-class X-ray flares during the 
			day, from NOAA AR 10715. In particular, a C7.3 X-ray
			flare (N05W11) between 10:53 - 11:29 UT with peak
			emission at 11:13 UT. EIT 195 images show, between 
			10:48 - 11:48 UT, a brightening on the aforementioned 
			AR followed by CME event characterized by a dimming 
			in the triangle delimited by NOAA AR 10715, 10716, 
			and trailing part of 10715. After 11:00 UT the dimming
			spreads to N and W of AR 10715. Also, an important
			intensity disturbance (wave) developing mainly toward 
			W and S of the AR. In summary, the event has therefore
			been determined as an extremely faint 'full' halo 
			event, slightly asymmetric, frontsided. 

15:06 UT  S West	Extremely faint and wide loop front spanning all above
			the S Pole. Barely visible in C3 on SW (it fades close
			to the inner edge). Another one seems to develop in C2
			since a little bit earlier on SE. Also very difficult
			to discern in C3, if discernible at all.

22:06 UT  S East	Pair formation. Separation point at ~ 3.9 solar radii
			(PA ~ 128).

2005/01/05 (Wednesday)

05:54 UT  N West	Brightening along streamer followed by a wide and 
			diffuse front above the W Limb at 06:30 UT. The event
			develops, at least, as a partial Halo CME spanning, 
			though very faintly, up to above the N Pole. GOES
			recorded a C8.2 X-ray flare on NOAA AR 10715 between
			04:03 - 05:44 UT with peak emission at 05:22 UT. EIT
			195 observes a filament channel activation (AR 10715) 
			and a dimming region to W, SW, and S of the AR between
			round 04:00 - 05:48 UT (development of a CME coming 
			out from nearby the AR). 

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