LASCO Activity Report for
November 08, 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

2004/11/05 (Friday)

	
03:30 UT  N Pole	In the aftermath of previous halo event, several 
			faint and expanding loop fronts.
 
06:30 UT  W Limb	Jet-like front that quickly fade. It is followed at 
			07:54 UT by a bright and very narrow ragged loop front.

10:30 UT  W Limb	Similar event to the previous one. A jet-like front that
			quickly fades preceding at 12:06 UT a brighter feature
			resembling a very narrow loop front.

12:54 UT  EN East	Ragged and elongated front. It is preceded at 10:54 UT,
			on W, by a very faint and diffuse loop front that fades 
			throughout C2. Apparent expanding outflow all around
			the occulter. GOES reported an M4.0 X-ray flare on 
			NOAA AR 10696 (N08E15) between 11:23 - 11:33 UT with 
			peak emission at 11:30 UT.

14:54 UT  W Limb	Bright and narrow front that fades throughout C3.

2004/11/06 (Saturday)

	
Extremely 
01:31 UT  N Pole	Extremely bright loop front spanning all above the N
			Pole. Faint extensions can be seen on SW. By 02:06 UT,
			an apparent new front seems to develop in C2 toward N. 
			C3 images show the complex event starting at 02:18 UT,
			almost surrounding completely the occultor. However, as
			in previous events, the signal is barely visible above
			the S Pole and on SE. After 02:42 UT, C3 images show the
			development of a diffuser front mainly toward NE
			(extension on SW apparently associated with this first
			front) followed by a brighter front spannig ~ 215 deg,
			from PA 265 - 120 (05:18 UT). By 06:18 UT, the angular
			span of the event considered as a whole is about 275 deg
			from PA 205 - 120. The mean plane-of-sky speed of the 
			LE of the outermost front at PA 23 was ~ 960 km/sec
			(based on C3 data) showing an slight acceleration. And
			just for reference, the mean plane-of-sky speed of the
			outermost front at: i) PA 093: 643 km/sec, and ii) 
			PA 256: 550 km/sec.
			GOES recorded three X-ray flares almost one after 
			another form NOAA AR 10696, by the time at N10E08:
		      - an M9.3 X-ray flare  between 00:11 - 00:42 UT with peak
			emission at 00:34 UT, 
		      - an M5.9 X-ray flare  between 00:44 - 01:10 UT with peak
			emission at 00:57 UT,
		      - an M3.6 X-ray flare  between 01:40 - 02:08 UT with peak
			emission at 01:57 UT,
			On the other hand, EIT 195 images show a brightening on
			the aforementioned AR starting at ~00:24 UT, and peaking
			at 00:36 UT. Signatures of a big CME develop afterward
			with epicenter on the AR are clearly visible. Another
			brightenings on the same AR can be seen at 01:13 UT, 
			and 01:48 UT.
			In spite of the weakness of the signal above the S Pole
			and SE Limb, and from a global point of view, the event
			as a whole has therefore been determined as a complex
			partial halo CME, frontsided. However, the symmetry of
			the event makes it suspicious and one is lead to think
			whether it was a full halo. Please also keep in mind 
			that in fact a couple of events close in space and time
			occurred.

05:30 UT  N Pole	Elongated ragged loop front.

09:06 UT  N East	Fast elongated fan-like front. It fades throughout C3.

12:30 UT  NN West	Diffuse ragged loop front that fades throughout C3.

18:54 UT  NN West	Very faint, elongated and diffuse loop front.

19:31 UT  ES East	Ragged loop front.

2004/11/07 (Sunday)

	
03:30 UT  N West	Ragged front in gusty outflow. By 06:30 UT, a faint 
			loop front develops, fading later throughout C3.

07:54 UT  ES East	Faint ragged loop front.

09:30 UT  N East	Jet-like front that quickly fades.

09:30 UT  N West	Ragged loop front followed a little bit to S by the 
			very slow development of a system of loops along the 
			streamer.

14:30 UT  N West	Brigh loop front above the NW Limb, developing 
			superposed in the LOS with the slow evolution of a 
			system of looops along the streamer. By 17:06 UT, the
			event is completely surpassed by the following 'halo'
			event. See nect event for more details.

17:06 UT  N West	Bright and very wide loop front, developing mainly 
			toward WNW, with faint extensions on S that give the
			appearance of a full halo CME from its very beginning.
 			The halo event is first seen in C3 at 17:18 UT. Please
			note that the previous front first appeared in C3 at
			16:18 UT, being completely surpassed by the halo event 
			at 17:18 UT. During the evolution of the halo event in
			the C3 FOV, a proton storm develops, becoming stronger 
			by 21:30 UT (C2 time). The mean plane-of-sky speed of 
			the LE of the outermost front at PA 2 was ~ 1770 km/sec
			(based on C3 data) showing practically no acceleration.
			If taken into account the LE as the outermost part of 
			the brightest feature (not the outermost one), the mean
			speed was 1460 km/sec at PA 356. And just for reference,
			the mean plane-of-sky speed of the outermost front at:
			i) PA 052: 1180 km/sec, and ii) PA 229: 1100 km/sec.
			GOES recorded high X-ray activity with several B- and
			C-class X-ray flares all along the day from NOAA AR
			10696. In particular, note the X2.0 X-ray flare from 
			that AR (N09W17) between 15:42 - 16:15 UT with peak
			emission at 16:06 UT, most likely associated to the Halo
			event. It is also worth to mention the C7.0 X-ray flare
			(N08W14) between 13:58 - 14:20 UT with peak emission at
			14:07 UT, most likely related to the 'first' event,
			reported to be seen on NW. On the other hand, EIT 195
			images show a brightening on the aforementioned AR
			starting at ~14:00 UT, followed at 15:12 UT by the
			apparent ejection of material toward NW. By 16:00 UT, a
			very strong brightening is seen to occur above the
			aforementioned AR (signature of the X2.0 X-ray flare)
			followed by a strong intensity disturbance travelling
			across the disk with epicenter in that AR (the
			disturbance is stronger toward N).
			For completeness, please note that the C3 images show,
			starting at about 21:18 UT, signatures of what it could
			be considered as an apparent much fainter and ragged 
			halo in the aftermath of the previous big halo event.
			In summary, the event as a whole has therefore been
			determined as a 'full' halo CME, frontsided. But please
			keep in mind that in fact a couple of events close in
			space and time occurred.

22:30 UT  N west	'Explosive' ragged front.

2004/11/08 (Monday)

	
04:06 UT  HALO		....