LASCO Activity Report for
November 09, 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

2004/11/08 (Monday)

	
04:06 UT  HALO		Signatures likely related to the event were first 
			seen in the C2 FOV at 04:06 UT: i) a faint and diffuse
			loop front above the S Pole, and ii) a narrow and
			brighter ragged front developing toward NW preceded at
			03:30 UT by ragged and not well defined narrow front. 
			By 04:30 UT, the C2 occultor is already completely
			covered by a rather symmetric and diffuse halo. The
			signature marked as ii) is first seen in C3 at 04:18 UT
			surrounded by a diffuse front ahead of it. The 'halo'
			itself covers the C3 occultor by 05:42 UT. For reference,
			the mean plane-of-sky speed of the outermost front of 
			the 'halo' at several PA was: a) PA 042: 443 km/sec,
			b) PA 214: 520 km/sec, and c) PA 147: 430 km/sec. As 
			for the elongated feature in NW, the mean plane-of-sky
			speed at PA 318 was ~500 km/sec.
 			EIT 195 images show a brightening on NOAA AR 10696 
			starting at ~02:12 UT, peaking at 02:24 UT, and followed
			by an intensity disturbance (CME signature) developing
			apparently toward N, E, and S. Another brightening can 
			be distinguished at 03:36 UT, most likely related to 
			C7.9 X-ray flare (see below). On the other hand, GOES
			recorded a C7.9 X-ray flare (during a long duration 
			X-ray event) from NOAA AR 10696 (N08W20) between 03:25 -
			03:36 UT with peak emission at 03:29 UT, possibly
			associated to the event related to the features 
			described in ii). Please also note that the CME 
			signature in EIT is before the X-ray flare. Also several
			optical flares from nearby the AR were reported, in
			particular at 02:24, 02:45, 03:00, and 03:30 UT (peak
 			emission). In summary, the event as a whole has 
			therefore been determined as a 'full' halo CME,
			frontsided. But again please keep in mind that in fact 
			a couple of events close in space and time occurred.

07:31 UT  S West	Elongated loop front that fades throughout C3.

	11:06 - 14:06 UT	Temporary Data Gap.

14:54 UT  N West	Bright and fast ragged loop front. Gusty outflow well
			into next day.
			GOES reported a C7.7 X-ray flare from NOAA AR 10696
			(N06W35) between 14:30 - 14:38 UT with peak emission at
			14:35 UT. There is a report from NOAA of another X-ray
			flare afterward from the same AR: an M2.3 X-ray flare
			(N08W36) between 15:43 - 15:52 UT with peak emission
			at 15:49 UT. By 17:30 UT a very faint and not well
			defined front could be guessed.
	

2004/11/09 (Tuesday)

	
01:27 UT  WN West	Ragged loop front followed by an elongated ragged loop
			front a little bit to S (at 02:50 UT). By 05:06 UT
			another ragged front follows. They all fade throughout
			C3. 				

09:26 UT  ES East	Bright loop front and trailing material.