LASCO Activity Report for
May 19, 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

LASCO will be participating with the coronal holes/streamer boundary study 
of UVCS/SUMER/CDS during May 17th through 23rd. It introduces only slight
modifications to the LASCO synoptic observation plan:

For C2: 6 hr cadence in orange filter pB (02:54 - 08:54 - 14:45 - 20:54 UT)
For C3: 12 hr cadence in orange filter pB (10:42 - 22:42 UT)


SOHO Telemetry Submode changed to Submode 5 on 2004/04/13 at 16:00 UT 
(SUMER began observing on 2004/04/14). SUMER campaign runs until 2004/06/17.
In other words, LASCO synoptic observation plan cadence remains the same
but the EIT CME watch images will be reduced to half-resolution (512x512)
during that period.

2004/05/18 (Tuesday)

00:06 UT  W Limb	Slow development of a twisted structure. Gusty outflow
			(moving faster than the twisted structure) superposed 
			in the LOS. Some small ragged fronts can be discerned 
			to S (at PA ~ 241) along the day.

08:50 UT  E Limb	Bright and big spray-like front. Some trailing material.
			It fades throughout C3. By ~ 10:26 UT some infalling
			material to S (at PA ~ 115) with corresponding
			feature moving outward.

14:50 UT  S East	Very faint asymmetric loop front starts developing at
			~ 3.6 solar radii. Barely visible in C3.

21:26 UT  N East	Faint asymmetric front expanding toward N. It is 
			preceded by rather similar signatures since early in the
			afternoon (though not very clear).
			 

2004/05/19 (Wednesday)

03:26 UT  WS West	Ragged loop front followed at ~ 06:26 UT by a twisted
			structure.

08:26 UT  W Limb	Ragged front just N of previous event developing 
			slightly toward WSW.

09:26 UT  S East	Very faint asymmetric loop front. It is first seen at 
			~ 3.7 solar radii. 

11:50 UT  N Pole	Very faint loop front developing slightly toward NNW.
			It is first seen at ~ 3.8 solar radii.