LASCO Activity Report for
June 9, 2005 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

* Telemetry KEYHOLE (SOHO will stay in TM Submode 5 during the Keyhole): 
  2005/06/05 - 2005/06/25: 26 m
  2005/06/09 - 2005/06/20: 34 m

* During the KEYHOLE, LASCO will be in synoptic program at the usual 
  cadences, with little loss of telemetry throughout due to the advanced
  recorder setup.

* 2005/05/06 - 2005/06/24: EIT Bakeout (==> No EIT CME Watch).
  EIT performed the long pre-bake calset (06/06 15:58-21:45 UT) and went 
  to heaters on at 21:52 UT. EIT will be in bake till June 24 @ 10:00 UT 
  and should resume imaging by (06/24) 20:00 UT.
 

2005/06/08 (Wednesday)

	
02:00 UT  N East	Very faint elongated front that fades throughout C2.

05:12 UT  W Limb	Extremely faint and diffuse brightening. It develops 
       (Partial Halo)	as an asymmetric and expanding loop front, extending 
			all above the SW limb, up to past the S Pole. The most
			western part of the LE reaches the end of the C2 FOV 
			by 13:12 UT. By that time, the part of the LE above 
			the S Pole is only midway to the end of the FOV. The
			event is first seen in C3 at 11:18 UT just appearing
			above the W Limb. The angular span of the event at 
			17:42 UT is ~ 190 deg (from PA 130 - 320), and still
			expanding. The mean plane-of-sky speed of the LE at 
			PA 285 was ~ 166 km/sec (based on C2 and C3 data). 
			The HT diagram shows an accelerated profile (speed 
			< 100 km/sec at the beginning of the C2 FOV, almost 
			300 km/sec at ~ 12 solar radii). There are no EIT 
			images available (EIT CCD bakeout under way: 2005/06/06
			21:52 - 2005/06/24 20:00 UT). GOES reported several B- 
			and C-class X-ray flares during the day, all from NOAA 
			AR 10776 (in average at around S06E40). The projection 
			of the event in the plane-of-sky as observed in the 
			LASCO FOVs makes it unlikely a direct association of 
			the event with the X-ray activity reported. On the other
			hand, images of the GOES Solar X-ray Imager (SXI) show 
			a small and quick brightening to the East of NOAA AR
			10772, starting at 01:41 UT and peaking at 01:45 UT. 
			The BBSO H alpha image taken on 2005/06/07 at 23:30 UT
			shows the existence of a filament to NNW of AR 10772
			(centroid of the filament at around S05W52). The
			corresponding H alpha image taken on 2005/06/08 at 
			19:00 UT no longer shows that filament (unless 
			projection effects make me misinterpret the image). In
			summary, the event has therefore been determined as a
			faint and very slow partial halo CME, apparently
			associated to the disappearance of a filament to NNW 
			of AR 10772. Should that be the case, then a component 
			of the event toward Earth would be likely. 

11:00 UT  EN East	Faint blob-like front. Some gusty outflow, very faint.

2005/06/09 (Thursday)

	
Mostly quiet.

	02:24 - 08:00 UT	Temporary Data Gap.

Time of the last C2 image analyzed: 14:24 UT.