LASCO Activity Report for
February 17, 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

2004/02/13

02:06 UT  S East	Typical '3-part' CME structure with a bright leading
			edge, cavity and twisted core material. The mean
			plane-of-sky speed averages 440 km/sec at PA ~121 
			based on C3 data, showing slight acceleration in C2 fov.
			EIT/FeXII images clearly show the ejecta coming out 
			from behind the solar disk.

02:30 UT  W Limb	Extremely faint ragged front that vanishes in C2,
			preceded at ~19:31 UT on previous day by infalling
			material, and followed at 04:30 UT by another small and
			faint ragged front.

10:54 UT  N Pole	Asymmetric front develops very slowly as a system of
			faint loops along streamer since early in the day, 
			with faint extension over N Pole and to NE. Time of 
			first appearance in C2 cannot be regarded as precise.
			At 16:30 UT another faint but faster front appears in 
			C2 FOV at PA ~ 340 deg and seems to push the previous
			front. At 20:30 UT the complex CME spans ~ 140 deg, 
			from PA 300 - 080 (C2). By that time, the streamer is
			being blown away. No significant activity shown in 
			EIT/Fe II images related to the event. Event classified
			as a 'partial' halo CME most probably backsided. 

20:30 UT  S West	Ragged front.

23:30 UT  N East	Faint loop front. Its southern leg seems to be at PA
			coincident with that of the leg at NE of the event
			reported as 'partial' halo CME.

2004/02/14

02:30 UT  N Pole	Couple of faint spray fronts (second one at 05:54 UT)
			developing slightly towards NE. They fade throughout C3.

11:06 UT  N East	Couple of faint ragged fronts. They fade throughout C3.

12:54 UT  N Pole	Faint narrow spray front. It fades close to the inner
			edge of C3.

21:30 UT  N Pole	Fairly faint elongated loop front with sharp cusp.

22:06 UT  N East	Fairly faint ragged front. It fades throughout C3.
	

2004/02/15

03:54 UT  S East	Bright loop front with cavity and bright inner core.
			Gusty outflow at PA of the northern leg, with several
			discernible ragged and small bright fronts along the
			day. EIT observes a prominence eruption on SE starting
			at 03:13 UT.

05:54 UT  S East	Faint ragged loop front extending slightly beyond
			northern leg of previous event. Not discernible in C3.

11:54 UT  N East	Fairly faint and small ragged fronts.

19:31 UT  N East 	Fairly faint ragged front to N of previous event.
	

2004/02/16

04:30 UT  E Limb	Bright ragged loop front brightest to N developing
			slightly toward S.

05:30 UT  S East	Ragged faint front to S of previous event followed by
			bright smaller front at 06:54 UT and trailing material.

07:31 UT  N East	Very faint spray front that fades throughout C2.

23:54 UT  W Limb	Wide and bright loop front with cavity. Twisted 
			inner structure developing toward NW. By 01:31 UT on 
			next day the CME spans ~ 147 deg from PA ~ 203 - 350
			(C2), having its LE at ~ 4.80 solar radii (PA 290 deg). 
			The bulk of the CME develops toward NW in C3 fov.

2004/02/17

04:54 UT  S West	Slow development along the day of faint loops' system
			along streamer.

07:54 UT  E Limb 	Faint jet-like front.