LASCO Activity Report for
November 04, 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

2004/11/03 (Wednesday)

	
02:06 UT  W Limb	Kind of 'explosive' (and initially bright) ragged loop
			front. Infalling material afterward. Pushed material
			superposed in the LOS on NW with the slow development 
			of the system of loops reported in previous day. The
			event fades throughout C2. GOES reported an M2.8 X-ray
			flare from NOAA AR 0691 (N12W75) between 01:23 - 01:37 
			UT with peak emission at 01:33 UT. EIT 195 images show
			a strong brightening on NOAA AR 0691 at -1:36 UT and
			a big CME signature afterward, all above the western
			Limb.

03:54 UT  EN East	Bright loop front with a very faint and diffuse
			extension all above the SE Limb and S Pole. It develops 
			toward NE as a bright loop front, the southern leg much
 			fainter than the rest. By 04:30 UT, a ragged front 
			begins to be seen above the S Pole. Its evolution show
			that this front seems to extend all above the W Limb, 
			N Pole, and NE Limb, looking like a second front in 
			the C2 FOV (just behind the original one at 03:54 UT) 
			on NE. The event was first seen on C3 above the E Limb,
			developing afterward mainly toward NE as an asymmetric
			loop front. The event looks pretty faint on SE, S, SW,
			and W. By the time the LE on NE reaches the outer edge 
			of C3 (about 10:42 UT), the event looks like a partial
			halo, spanning ~ 135 deg from PA 330 - 105. However, 
			in C2 one could say that the event (bulk of the mass 
			plus eventual shock) covers completely the occultor.
			The mean plane-of-sky speed of the LE of the front at 
			PA 49 was ~ 750 km/sec (based on C3 data) showing
			practically no acceleration.
			GOES reported an M1.6 X-ray flare on NOAA AR 10696
			(N09E45) between 03:23 - 03:57 with peak emission at
			03:35 UT, most likely associated to the event described
			above. On the other hand, EIT 195 images show a strong
			brightening on the aforementioned AR at 03:36 UT,
			followed by an intensity disturbance travelling mainly
			toward NE, jointly with a wave-like disturbance
			travelling partially across the disk with apparent
			epicenter on AR 10696.
			In summary and based on its appearance in the C3 FOV, 
			the event has therefore been determined as a partial 
			halo CME, frontsided.

16:06 UT  EN East	Bright loop front with a faint and diffuse extension 
			all above the SE Limb and S Pole. It's morphology is
			pretty similar in appearance to that of the event at
			03:54 UT. The difference is basically that i) it moves
			apparently faster, ii) the faint extensions on SE and 
			S look a little bit brighter, and iii) the C3 occultor
			seems to be completely covered (by 18:42 UT). The event
			is first seen in C3 at 16:42 UT. The mean plane-of-sky
			speed of the LE of the front at PA 43 was ~ 1016 km/sec
			(based on C3 data) showing practically no acceleration.
			GOES reported an M5.0 X-ray flare on NOAA AR 10696
			(N09E38) between 15:35 - 15:55 with peak emission at
			15:47 UT, most likely associated to the event described
			above. On the other hand, EIT 195 images show a strong
			brightening on the aforementioned AR at 15:48 UT, 
			followed as in the previous reported event by an
			intensity disturbance travelling mainly toward NE,
			jointly with a wave-like disturbance travelling 
			partially across the disk with apparent epicenter on 
			AR 10696. In summary, the event has therefore been
			determined as an asymmetric 'full' halo CME, frontsided.

18:54 UT  EN East	Ragged expanding front with a bright inner part. 
			Please also note that GOES reported an M1.0 X-ray flare
			again from NOAA AR 10696 between 18:03 - 18:35 UT with
			peak emission at 18:26 UT.
			EIT 195 images show a brightening on the aforementioned
			AR starting at ~ 18:00 - 18:12 UT and an intensity
			disturbance shortly afterward travelling mainly toward 
			W. By 22:08 UT, the event spans only about 70 deg in C3,
			from PA 20 - 90.

2004/11/04 (Thursday)

	
	Last C2 image analyzed at 00:54 UT.