LASCO Activity Report for
December 02, 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 Telemetry Submode changed back to Submode 5 on 2004/12/01 @ ~ 19:00 UT.
EIT 195 CME watch at half resolution (512x512) since then.

After the EIT Shutterles Campaign and while in Submode 6, EIT 195 CME 
watch at full resolution (1024x1024).

SOHO Telemetry Submode changed to Submode 6 at 14:00 UT on 2004/11/30 
(EIT Shutterless Campaign between 17:00 - 19:40 UT). It will be back 
to Submode 5 on 2004/12/01 at 19:00 UT.

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

2004/12/01 (Wednesday)

02:29 UT  S West	Faint asymmetric front.

04:53 UT  NN East	Jet-like front.

07:53 UT  NN East	At least three different features can be guessed at this
			time: i) a diffuse ragged front that will develop mainly
			toward NE-NNE, ii) a wide and ragged loop front that
			extends up to above the N Pole, (just appearing at this
			time), and iii) a bright front also just appearing on 
			ENE that will develop as a relative narrow loop (as
			compared to the other two features). Both, the feature
			described in i) and the one in iii) are first seen in 
			the C3 FOV at 08:18 UT, while the wide loop in ii) is
			first seen in C3, all above the N Pole, by 09:18 UT. 
			The total angular spans by 10:42 UT is about 180 deg 
			(C3), form PA ~ 270 - 090, and it matches apparently 
			the angular span of the wide loop front [ii)]. The mean
			plane-of-sky speed of the LE of the different features
			observed is given below (based on C3 data):
			Feature i)  : PA 036 --> 742 km/sec
			Feature ii) : PA 342 --> 326 km/sec
			Feature iii): PA 073 --> 731 km/sec
			GOES recorded an M1.1 X-ray flare from NOAA AR 10708
			(N09E19) between 07:00 - 07:41 UT with peak emission at
			07:20 UT, most likely associated to at least one of the
			features described above. EIT 195 images show a strong
			brightening on NOAA AR 10708 at 07:13 UT, followed by a
			rather circular intensity disturbance traveling away 
			from the AR. In summary, the event has therefore been
			determined as a complex partial halo event, frontsided.
			But keep in mind that several features contribute to 
			the overall morphology of the event. 

18:29 UT  NN West	Faint loop front preceded by the development of an 
			apparent system of faint loops. By 19:27 UT, an elongated
			feature develops at roughly the central PA of the loop
			front. As it develops it shows up as a blob-like front.
			A similar one at 22:06 UT (a little bit fainter).
	

2004/12/02 (Thursday)

01:27 UT  EN West	Faint ragged front accompanied to N by a narrow front
			moving apparently a little bit faster. By 02:50 UT, on
			NNW, a couple of blob-like fronts start to be discerned.
			They all fade throughout C3. Gusty outflow follows on
			NNW in the form of small blobs.

07:50 UT  N Pole	Very faint and raged front developing slightly toward
			NNE. It fades throughout C3. By 08:50 UT a very narrow
			loop-like feature (jet-like) is seen at roughly the PA 
			of its southern leg. And by 09:26 UT another faint and
			ragged loop front can be seen above the N Pole.