LASCO Activity Report for
May 11, 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

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.

2004/05/10 (Monday)

	  N East	Gusty outflow all along the day.

00:26 UT  S East	Slow development of a very faint feature later showing
			extensions up to the S Pole and making next event
			appear even wider.

04:50 UT  W Limb	Wide and bright ragged loop front with structured inner
			part. B1.9 X-ray flare reported by GOES on NOAA AR 10604
			(located by the time at S19W29) between 03:48 - 04:04 UT
			with peak emission at 03:55 UT. EIT Fe XII shows a
			filament channel activation at ~S20W25 between 01:48 
			and 03:48 UT. Despite its wide angular span in C2 and C3
			(e.g., from ~PA 180 - 330 by 14:18 UT in C3) the CME
			signature is not seen to cross the central meridian.
			Therefore, it could not be catalogued as a partial halo.
			The average plane-of-sky speed for the event measured
			on C3 data at PA 262 was 345 km/sec showing practically
			no acceleration.

06:50 UT  EN East	Faint spray-like front that fades throughout C2. It is
			followed slightly to S at 07:27 UT by a very narrow
			ragged loop front.

10:06 UT  S West	Following event at 04:50 UT, ragged front with twisted
			trailing material. Faint loop-like extensions above
			the W limb.

19:50 UT  S West	Bright ragged loop front. Between ~19:13 - 22:00 UT EIT
			Fe XII shows a backsided CME on SW limb with some
			filament motion on the near side.

2004/05/11 (Tuesday)

	  N East	Gusty outflow.

00:06 UT  WS West	Another bright ragged loop front. The event develops
			on the W limb as a twisted (and 'round') structure, 
			and on the SW with a ragged structure.

	05:10 - 13:30 UT	Temporary DSN Data Gap.