LASCO Activity Report for
November 12, 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

SOHO is in Telemetry Submode 5 since 2004/11/08 @ 22:15 UT. While in Submode 5, 
half resolution EIT 195 CME watch (512x512).

2004/11/10 (Wednesday)

	
02:26 UT  WN West 	Very bright and wide loop front, pretty fast. By 
	 Asymmetric	02:50 UT, the LE already exited the C2 FOV (the event
	    Halo	develops mainly toward NW). A proton storm starts
			developing by the time and continues all day long. 
			Faint extensions (shock?) up to NE. The C2 occultor is
			completely surrounded by the faint extensions by 03:06
			UT, though on SE the excess intensity is just above the
			occulter. C3 images show the event starting at 02:42 UT
			developing toward NW. By 03:42 UT, the C3 occultor is
			completely covered (as in C2, the excess intensity on 
			SE barely above the occulter), the event having the
			appearance of a very asymmetric 'full' halo event. 
			Please note that the 'bulk' of the mass, i.e., the loop
			front itself only spans from PA 215 - 010 (at 03:42 UT,
			measured in C3).
			For reference, the mean plane-of-sky speed of the
			outermost layer of the 'halo' at several PA is given
			(based on C3 data; the height-time plots show 
			practically no acceleration): i) PA 305: 2900 km/sec (*),
	 		ii) PA 002: 1975 km/sec, and  iii) PA 221: 1477 km/sec.
			(*) The error is big as the outermost part becomes very
			diffuse. Just for completeness, if taken as LE the
			brightest part of the LE of the front at PA 305, the 
			mean plane-of-sky speed becomes almost 2000 km/sec,
			pretty much alike the one at PA 002.
			GOES recorded an X2.5 X-ray flare from NOAA AR 10696
			(N09W49) between 01:59 - 02:20 UT with peak emission at
			02:13 UT, associated to the halo event. On the other
			hand, EIT 195 images show an extremely strong 
			brightening on NOAA AR 10696 starting at ~02:12 UT, 
			and followed by an intensity disturbance developing
			across the Sun's surface with epicenter in the AR.
			Release of a huge amount of material from a big 
			extension on the Earth-side face of the Sun can be
			guessed also from the EIT images. In summary, the event
			has therefore been determined as an asymmetric 'full'
			halo CME, frontsided. Much gusty outflow on NW.

04:50 UT  WN West	In the halo aftermath, an asymmetric and ragged expanding
			loop front develops.

10:50 UT  E Limb	Very faint and small expanding loop front that fades 
			throughout C3.

13:27 UT  WN west	Diffuse, narrow and apparently loop-like front that 
			fades throughout C3.

17:06 UT  WN West	Faint expanding fan-like front accompanied by gusty
			outflow to N. It is difficult to give an exact time of
			first appearance. It is followed at 21:26 UT by a
			blob-like front.

18:06 UT  ES East	Ragged and not well defined front that quickly fades.

2004/11/11 (Thursday)

	Proton storm continues.

	02:06 - 05:26 UT	Temporary Data Gap.

05:26 UT  W Limb	Elongated fan-like front developing slightly toward WSW.
			Infalling material to S.

07:27 UT  E Limb	Extremely faint ragged loop front developing slighty
		 	toward ENE. It fades very close to the inner edge of C3.

18:26 UT  E Limb	Faint spray-like front that fades close to the inner
			edge of C3.

20:26 UT  WS West	Very faint and narrow (jet-like) loop front vanishing
			by 23:50 UT. By that time, a faint loop front is seen
			instead fading in C3.

2004/11/12 (Friday)

	Still some protons.
	
01:27 UT  WS West	Very narrow loop front (jet-like) that fades very close
			to the inner edge of C3.

08:50 UT  S West	Extremely faint ragged front that fades throughout C2. 
			EIT 195 shows between 07:36 - 08:24 UT very faint loops
			and filament erupting.

10:50 UT  ES East	Faint and diffuse asymmetric loop front.

	14:45 - 19:05 UT 	Temporary DSN data Gap.