LASCO Activity Report for
August 28, 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

- Spacecraft Maneuvers (Station Keeping and Momentum Management,
  not roll) on 09/02 (TBC).

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

- LASCO will be recorded during DSN gaps confirmed thru 8/27+. 

- 12 minutes cadence for C2 during Keyhole.

2006/08/25 (Friday)

00:12 UT  S East	Elongated loop front. It fades throughout C3.

2006/08/26 (Saturday)

09:00 UT  S East	Very narrow loop front.

10:00 UT  SS West	Slow development of a systemn of very faint loop 
			fronts.

20:48 UT  SS East	Diffuse brightening develops as a Partial Halo Event.
			Two apparently different structures can be then
 			distinguished during its development: i) a very bright
 			and expanding loop front developing mainly toward SSE
 			[Feature 1], and ii) a ragged and wider loop front
			developing toward S, slightly behind [Feature 2]. The
 			latter was first clearly seen in C2 at 21:12 UT.
			Feature 1 is first seen in C3 at 21:42 UT appearing 
			on SSE, then developing as a bright and ragged loop
 			front, while Feature 2 shows up above the S Pole by
 			22:18 UT. By 02:18 UT (on 08/27), the event considered 
			as a whole (and mainly due to Feature 2] spans ~ 183 
			deg (from about PA 072 - 255). The mean plane-of-sky
 			speed of the outermost front of the event (Feature 1)
			at PA 170 was ~ 730 km/sec (based on C3 data), showing 
			practically no acceleration. Note that the LE of 
			Feature 1 becomes very faint and diffuse by 00:42 UT
 			(08/27). As for Feature 2, the mean-plane-of-sky speed
 			of its LE at PA 172 deg was ~ 585 km/sec. GOES reported
 			a C2.5 x-ray flare on NOAA AR 10905 (S11E10) between
 			19:52 - 20:32 UT with peak emission at 20:07 UT. EIT 
			was in CCD Bakeout, therefore no EIT images available.
			In summary, the event has therefore been determined 
			as a Partial Halo Event, frontsided, associated with 
			the C2.5 X-ray event on AR 10905.

2006/08/27 (Sunday)

14:00 UT  E Limb	Very diffuse and faint front that fades close to 
			the inner edge of C3.

16:00 UT  NN West	Diffuse jet-like front.

16:12 UT  S Pole	Jet-like front.

17:12 UT  E Limb	Very narrow loop front.

19:12 UT  SS West	Elongated and ragged asymmetric loop front.

2006/08/28 (Monday)

Last C2 image available by the time of writing: 01:00 UT.