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.
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).
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.