LASCO Activity Report for
June 08, 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

VENUS was expected to enter the EIT FOV at 08:21 UT on 2004/06/08. 
However, the signal was to faint at that part of the FOV. It can be 
discerned by around 12:00 UT.

VENUS entered the C2 FOV from the left on 2004/06/07 (Monday) at 
around 13:20 UT.

VENUS entered (from the left) the C3 field of view on 2004/06/03 
(Thursday) at around 16:00 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.

2004/06/07 (Monday)

01:26 UT  S West	LASCO observed a faint asymmetric 'full' halo CME on
			2004/06/07. Several events occurred. The likely 
			signature corresponding to the faint 'halo' event was
			first observed (though still barely discerned) in C2 at
			00:50 UT as a very diffuse front above the WSW limb. By
			01:27 UT, it is clearly identified as a very diffuse 
			loop front (1). By this time, a bright loop front (2)
			starts developing above the SW limb. Feature (2)
			develops in C2 exhibiting an apparently twisted inner
			structure. By 03:50 UT, extremely faint extensions seem
			to surround completely the C2 occultor. The diffuse 
			front (1) is first seen in C3 above the WSW limb at 
			01:42 UT, while the loop front (2) is first seen in the
			next frame, i.e., at 02:18 UT. The front (2) seems to 
			be confined almost completely within PA 155-295.
			Meanwhile, faint extensions, likely belonging to feature
			(1), completely surround the C3 occultor by 07:42 UT.
			Gusty outflow in Sw along the day.
			GOES reported the following X_ray events which could
			likely be associated with the C2/C3 events mentioned
			above:
			(a) a B3.4 X-ray event at S07W00 (associated to NOAA AR
			10624) between 22:26 - 23:14 UT with peak emission at
			22:53 UT (on 2004/06/06).
			(b) a C2.7 X-ray event at S17W42 (associated to NOAA AR
			10621) between 00:01 - 01:15 UT with peak emission at
			00:44 UT (on 2004/06/07). This event is indeed clearly
			associated with the C2/C3 event (2).
			
08:50 UT  N East	Ragged elongated loop front. It fades throughout C3.

11:50 UT  WS West	Faint elongated front. It fades throughout C3.

19:38 UT  EN East	Bright narrow ragged spray-like front. It fades in C3.

21:59 UT  N West 	Diffuse front appears above NW Limb. By 23:34 UT a 
			bright ragged front is discerned with apparently 
			twisted inner structure. In C3 FOV, after 03:18 UT on
			next day, two different features are apparent: i) the
			ragged loop front developing WNW, and ii) a narrower
			feature with a diffuse front a little bit ahead
			developing toward NW.
						

2004/06/08 (Tuesday)

05:26 UT  N East	Diffuse faint and ragged loop front. Faint extensions
			above N Pole and on SE quadrant. Related to the event??

06:06 UT  E Limb	Bright loop front.
		
	07:45 - 19:15 UT	LASCO C2/C3 Data Gap because of 
				EIT Venus Observation Program.
				First C2 image expected at around 20:30 UT.