LASCO Activity Report for
April 12, 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

2004/04/09

00:30 UT  W Limb	Ragged front that quickly fades.

04:30 UT  N East	Ragged asymmetric loop front.

09:54 UT  E Limb	Faint ragged front developing toward SE that fades in
			C2. It is followed to SE at 12:54 by a spray-like front 
			moving much faster, that fades close to the inner edge
			of C3 FOV.

11:54 UT  S West 	Very narrow asymmetric loop front. It fades in C2.

20:30 UT  S West	Bright ragged loop front. By 21:54 UT clear faint
			extensions can be seen spanning approximately 260 deg,
			from PA 100 - 360. The front is first seen at 21:08 UT 
			in C3. The mean plane-of-sky speed was ~940 km/s at 
			PA 211 as measured on C3 data. NOAA AR 0588 (by the time
			at S16W29) produced a C2.8 X-ray between 20:13 and 
			21:02 UT with peak emission at 20:40 UT, which was
			associated with the 'partial' halo CME. 
 		

2004/04/10

00:54 UT  S West	Bright ragged loop front.

03:54 UT  N Pole	Bright asymmetric loop front and apparently twisted
			structure superimposed in the LOS with trailing material. 
08:06 UT  S West	Ragged loop front slightly to N of event reported to
			start at at 00:54 UT.

17:54 UT  S West	Narrow ragged loop front.

19:31 UT  S West	Ragged loop front slightly to N of previous event.

	22:00 - 24:00 UT	Data Gap.

2004/04/11

00:54 UT  N East	Bright ragged front and twisted structure already in
			progress (by the end of C2 FOV) after data gap.

04:30 UT  S West	Extremely bright loop front. By 06:30 UT (last frame
			available before data gap), the event spans in C2 
			~ 300 deg, from PA 060 - 360. It is first seen in C3 at
			05:18 UT as a thick and bright loop front mainly
			developing toward SW. NOAA AR 0588 (located by the time
			at S16W46) produced an isolated C9.6 X-ray flare between
			03:54 and 04:35 UT with peak emission at 04:19 UT. EIT 
			Fe XII images show a brightening on the AR mentioned
			starting at 04:00 UT, as well as material ejecta from
			that AR coming out toward SW.
			
	06:30 - 13:30 UT 	Temporary Data Gap.

13:42 UT  HALO		Time of C3. A full halo CME is seen in C3 FOV right 
			after the data gap, the main direction of development
			being toward NW. By 13:52 UT C2 also clearly show the
			development of the full halo CME, with much gusty
			outflow to NE afterward, and well into next day. Due to
			the data gap, it is difficult (by the time of writing) 
			to discuss about its origin and direction. No X-ray 
			event was reported by GOES by the time, except for the
			one mentioned for previous event.

20:30 UT  S East	Extremely narrow ragged loop front (jet-like).

23:30 UT  S West 	Narrow ragged loop front.
	

2004/04/12

00:30 UT  S East	Another very narrow ragged loop front.

00:54 UT  S West	Faint asymmetric loop front extending up to above W 
			limb.

09:54 UT  S West	Ragged (spray-like) loop front.

11:06 UT  E Limb	Ragged front (spray like).