LASCO Activity Report for
June 07, 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 is expected to enter 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.

2004/06/04 (Friday)

	
02:26 UT  W Limb	Fan-like front developing toward WNW. It is surpassed 
			in the C3 FOV by the event reported to start at 07:50 UT.

06:50 UT  WS West	Narrow ragged loop front, surpassed later by event
			reported to start at 07:50 UT.

07:50 UT  W Limb	Complex event: Very bright loop front (1) above the W
			limb, with the typical appearance of a limb event. At
			08:06 UT an apparently 2nd front (2) can be discerned 
			in the NW quadrant of C2 with its LE ahead of the loop
 			front. By 09:26 UT faint extensions surround almost the
			C2 occultor, spanning ~ 260 deg from PA 165 - 65. It is
			difficult to establish their association to the features
			aforementioned.	EIT Fe XII running difference images 
			show signatures of a CME above the W Limb starting at
			07:36 UT, apparently originated on the far side of the
			Sun, though relatively near the limb. Starting at 
			07:48 UT an intensity disturbance is seen to travel 
			toward N and S (always above the limb) as the event
			develops. Given the fact that no visible signatures are
			seen on the disk, nothing can be said about their likely
			association. Likewise, GOES recorded no significant 
			X-ray activity during the day. Therefore, from a global
			point of view, this event could be catalogued as a 
			'partial' (almost 'full') halo CME, backsided. Gusty
			outflow follows on WNW Limb along the day.

	15:00 - 17:00 UT	Special LASCO C3 Venus Observations.
				No EIT images.

2004/06/05 (Saturday)

02:06 UT  WS West	Ragged 'flat' loop front. It fades throughout C3.

06:26 UT  WS West	Bright spray-like front. It surpasses previous event
			in the C3 FOV by ~07:32 UT, fading afterward. Couple
			of faint ragged loop fronts above the W Limb by 07:27 UT.

09:06 UT  N Pole	Bright and wide loop front. It fades throughout C3.

09:06 UT  N East	Elongated spray-like front just to S of the north 
			eastern leg of previous event. It is followed by a 
			similar front at 11:50 UT. By 14:50 UT a ragged loop
			front follows. They all fade throughout C3.

16:06 UT  NN West	Slow development of a faint ragged loop front.

18:26 UT  NN East	Couple of wide loop fronts that quickly surpase event
			reported to start at 16:06 UT in the C2 FOV.

	21:00 - 23:00 UT	Special LASCO C3 Venus Observations.
				No EIT images.

2004/06/06 (Sunday)

00:06 UT  EN East	Bright and narrow spray-like front just to S of the leg 
			in the NE quadrant of event reported to start at 
			18:26 UT on previous day. It fades throughout C3.	

06:26 UT  W Limb	Fairly faint narrow loop front. It fades throughout C3.

	15:00 - 17:00 UT	Special LASCO C3 Venus Observations.
				No EIT images.

17:26 UT  W Limb	Fairly faint couple of loop fronts developing toward
			W and N. Not well defined front. They fade close to the
			inner edge of C3.

2004/06/07 (Monday)

01:26 UT  S West	Wide loop front with apparently twisted inner structure.
			Faint front ahead of the loop and to N. By 03:50 UT
			extremely faint extensions seem to surround completely
			the C2 occultor. GOES observed a C-class X-ray event
			early on the day associated with NOAA AR 10621, by the
			time at S17W42. EIT Fe XII running difference images 
			show a big CME signature traveling SW starting at around
			00:12 UT from AR 10621.
			
08:50 UT  N East	Ragged elongated loop front.

11:50 UT  WS West	Faint elongated front.