LASCO Activity Report for
October 28, 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

Kreutz comet entering the C2 FOV on 2004/10/27 at ~ 22:06 UT from the SW 
(bottom a little bit to right). It fades out completely by 02:06 UT on next 
day.

2004/10/27 (Wednesday)

05:30 UT  N West	Faint blob-like front.	

06:54 UT  E Limb	Bright and very narrow front that quickly fades.	 

10:30 UT  EN East	Wide loop front developing mainly toward NE, with 
			another apparent loop front inside. The wide loop 
			front is first seen in C3 at 12:42 UT, exhibiting 
			an average plane-of-sky speed in C3 of about 
			275 km/sec at PA 63 deg with practically no 
			acceleration. However, that feature shows a slight 
			acceleration while in the C2 FOV. By 14:30 UT, the 
			loop spans about 140 deg in C2 (from  PA 340 to PA 
			120). Afterward, it seems to fully cover the occultor,
			having the appearance of a very asymmetric 'full' halo 
			CME, though it is difficult to be certain due to the 
			superposition with the feature described in event
			reported to start at 12:30 UT on S.	 

12:30 UT  S Pole	Very faint and diffuse wide loop front.	It is too 
			faint (barely discernible) in C3 to give an accurate 
			value of its plane-of-sky speed. However, a value of 
			312 km/sec at PA 184 was measured. Please note that
			there is report of only one significant X-ray event 
			prior to this or previous event (the one at 10:30 UT): 
			GOES recorded a C1.1 X-ray flare from the NOAA AR 10687 
			(N09W19) between 05:54 - 06:05 UT with peak emission 
			at 05:59 UT. It doesn't seem likely to have any 
			association with any of the features seen in C2. But, 
			on the other hand, EIT 195 images show, starting at 
			about 09:24 UT, what it seems to be a faint ejection 
			from nearby NOAA AR 0691 (~N15E25) toward S. Moreover, 
			by 12:00 UT it shows another apparent small ejection 
			from NOAA AR 0689 (by the time pretty close to the 
			central meridian, North 10). It is difficult to say 
			if any of the events seen in C2 is related to the 
			apparent ejections seen in EIT.	This event jointly
			with the one at 10:30 UT could therefore been 
			determined as a complex, probably frontsided event, 
			in spite of the temporal correlation observed with 
			the EIT 195 images. But, it is hard to be certain.

17:30 UT  W Limb	Faint blob-like front. It fades throughout C3.	 

2004/10/28 (Thursday)

07:31 UT  E Limb	Expanding faint system of loops. Difficult to give an 
			exact time of first appearance.	 

09:30 UT  N West	Diffuse and ragged loop front preceded by an even more
			iffuse front.