LASCO Activity Report for
September 02, 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

2004/09/01 (Wednesday)

02:54 UT  ES East	Ragged loop front. It fades close to the inner edge of
			C3 FOV.

03:30 UT  EN East	Very faint ragged and diffuse front that quickly fades.
			It is followed at 06:54 UT by a similar front above 
			the E Limb that also quickly fades.

03:30 UT  W Limb	Ragged elongated loop front with fain loop-like
			extensions to S. It is preceded at 01:54 UT by a faint
			kind-of spray-like front.

06:30 UT  E Limb	Another very faint and ragged front that quickly fades.

12:55 UT  N Pole	Extremely faint and diffuse front. Difficult to give an
			exact time of first appearance. Its development seems
			to be affected by event at 15:38 UT.

	14:00 - 16:40 UT	EIT Shutterless Run #2 
				(no C3 images, ~1 C2 image/hour)

15:38 UT  WS West	Complex event that developed as a very asymmetric halo
			CME. The event was first observed in C2 at about 
			15:38 UT above the WSW Limb as, apparently, two loop 
			fronts embedded in a diffuse structure. By 17:50 UT 
			the event developed as a very asymmetric full halo CME 
			in C2; the leading edge in the SW direction having
			already left the C2 FOV, while in the E direction the
			front is barely above the C2 occultor. The event was
			first seen in C3 at 16:38 UT above the WSW Limb. Please
			anote that by that time a feature brighter to N starts
			developing toward ENE in the C3 FOV, and seems to give
			a different appearance to our event. By ~ 00:18 UT on
			next day the event is practically no longer visible,
			apparently without having reached the end of the C3
			FOV. The mean plane-of-sky speed for the LE of the
			outermost loop front at PA ~ 245 was ~ 442 km/sec. 
			On the other hand, the inner front showed a plane-of-sky
			speed of about 400 km/sec at PA ~ 250 (in both cases
			based only on C3 data). GOES did not record any
			significant X-ray activity by the time. Likewise, the
			available EIT Fe XII images do not show any signature 
			on the visible disk. Please note that by that time EIT
			was performing the Run #2 of the Shutterless Campaign.
 			Inspection of the EIT movie made with the images of the
			Shutterless sequence do not show anything (in the
			restricted FOV) that could be related to our event. 
			The event has therefore been determined as an asymmetric
			'full' halo CME, most probably backsided. 

23:06 UT  WN West	Elongated and diffuse loop front.

2004/09/02 (Thursday)

	  N West	Gusty outflow.

	  ES East	Infalling material.

01:31 UT  W Limb	Blob-like front becomes discernible.

09:30 UT  WN West	Diffuse and elongated ragged loop front.