LASCO Activity Report for
September 11, 2006 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

KEYHOLE Operations: 
-------------------
2006/08/21 - 2006/09/19 : 26 m Keyhole
2006/08/28 - 2006/09/13 : 34 m Keyhole

- LASCO safed for maneuvers (SK and MM) on 09/05 @ 18:00 UT. 
  LASCO recovery expected for late on 09/07; therefore, 
  observations started on 09/07 @ ~ 22:00 UT.

- Spacecraft Maneuvers (Station Keeping and Momentum Management,
  not roll) on 09/06.

- 2006/08/19 - 2006/09/16 : EIT CCD Bakeout

- At least until next S/C maneuvers (scheduled for 09/06), 
  LASCO will NOT be recorded during DSN gaps (starting on 08/28, 
  until 09/16). 

- 12 minutes cadence for C2 during Keyhole (only during contact 
  periods since 08/28, which are sparse...).

2006/09/08 (Friday)

00:12 UT  WN West	A bright loop front (development missed in the
			next data gap). By 04:24 UT the loop front is close 
			to the outer edge of C2. It appears surrounded by a
 			fainter and much wider front spanning all across 
			the western hemisphere up to past the S Pole. Just
 			before the second data gap, the C2 occulter seems 
			to be surrounded, though the signal on E is barely
 			discernible and only very close to the occulting 
			disk. More faint wide loop fronts continue appearing 
			on W. Only one C3 frame (05:18 UT) shows something 
			of the event. Though the event covers a big angle 
			in the western hemisphere, the S Pole is not crossed 
			by that time. Afterwards, there is another data gap, 
			so nothing else can be said. After this second gap, 
			C2 shows a loop front already developing on WSW.
			Very faint and diffuse loop-like extensions seems 
			to be developing above the S Pole. C3 shows no 
			remnant signatures of any Halo event. No EIT images 
			are available due to EIT CCD bakeout (the bakeout 
			will last until 09/16). GOES recorded a couple of 
			short duration B-class X-ray flares on NOAA AR 10909
 			during the time of the first LASCO data gap: i) a 
			B4.4 on S07E06 between 01:30 UT - 01:47 UT with peak
 			emission at 01:39 UT, and ii) a B3.3 on S07E05 
			between 02:34 - 02:45 UT with peak emission at 
			02:39 UT. And then during the second data gap, it
 			recorded a B5.6 on the same AR (S06E01) between 
			10:13 - 11:46 UT with peak emission at 10:58 UT. In
 			summary, an apparently faint and asymmetric Halo 
			Event was observed by LASCO C2. It is hard to say
 			whether the different structures mentioned above 
			belong to a unique event. It seems to exist a 
			temporal correlation between the activity on AR 
			10909 and the faint and diffuse wide loop-like
 			extensions aforementioned. 

	LASCO data gap between 00:12 - 04:12 UT.

	LASCO data gap between 05:14 - 14:24 UT.

	LASCO data gap between 16:36 - 23:36 UT.

23:36 UT  S East	System of faint loops already under development after
 			data gap.

2006/09/09 (Saturday)

	LASCO data gap between 00:00 - 07:24 UT.

07:24 UT  S East	Development of faint system of loops continues (LE 
			already past the outer edge of C2). A faint twisted
			structure develops behind.

	LASCO data gap between 13:00 - 20:57 UT.

2006/09/10 (Sunday)

	LASCO data gap between 00:24 - 07:12 UT.

	LASCO data gap between 10:12 - 23:12 UT.

23:12 UT  E Limb	Faint ragged front already under development after
			data gap.

2006/09/11 (Monday)

See Report named "obs20060915.html".