LASCO Activity Report for
January 21, 2004 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

2004/01/20

00:06 UT  HALO		Big loop front travelling S with cavity and core 
			develops into a full halo CME. Gusty outflow follows
			to S. C8.2 X-ray flare on NOAA AR 10540 starting at 
			19:54 UT.  EIT shows material coming out from above
			the AR starting at around 22:24 UT. The event has
			therefore been determined frontsided.

03:54 UT  N East 	Infalling material starting at ~3.70 solar radii with
			similar feature travelling outward, followed by
			infalling narrow 'helmet-like' front at 06:54 UT. 
			Several 'boomerang-type' features travelling outward
			follow to N. Separation occurs at ~ 4.3 solar radii. 
			At the same time gusty outflow at N Pole.

08:06 UT  S Pole	Very faint loop front followed at 08:30 UT by a narrower
			ragged loop front at S Pole and trailing material. 
			Gusty outflow follows.

12:06 UT  W Limb	Faint spray front. It fades close to the inner edge
			of C3.

13:54 UT  E Limb	Faint spray front. It fades throughout C3.

15:06 UT  N Pole	Faint loops. Difficult to determine exactly the time 
			of first appearance.

18:54 UT  W Limb	Asymmetric ragged loop front slightly to S.

23:54 UT  W Limb	Ragged loop front.

2004/01/21

00:54 UT  E Limb	Spray-like front.

03:06 UT  E Limb	Jet-like front slightly to S.

04:54 UT  E Limb	Bright loop front with cavity and core developing 
			toward SE. By 06:30 UT the loop spans ~ 175 deg from 
			PA 45 - 215. By 06:54 UT very faint extensions arounding
			the rest of the C2 occultor are discernible. A big
			filament on the SE quadrant in EIT images is seen to
			erupt starting at 04:00 UT. Therefore, the event has 
			been determined as a 'full' halo CME, frontsided.