SOHO/LASCO Partial HALO CME 121108a

UCMEO 93001 21109 2050/
21108 60236 80842 2901/ 171// 323// 30916
21108 60211 80303 18812 11611 1112/
99999

PLAIN

SOHO/LASCO observed a partial HALO CME on November 8, 2012.  Event is first seen in
C2 beginning 02:36 UT with a loop over the NE.  The event expands with extensions
PA 290-171 for a total width of 241 degrees wide.  The event continues into the
C3 field beginning 03:06-08:42 UT out to the edge of field at 30 Rsun in the Northeast.

Time/height measurements were marked at 3 points in C2 with speeds of
915.5 Km/sec at pa 71 degrees. The event is marked to 11 points in C3.  
Speeds average through both fields to 915.5 Km/sec at PA 70 degrees.
Acceleration -0.46 m/sec^2. 

SDO AIA 193 shows a flare of AR 11611 02:12-03:03 UT located [N12,E88].
A dimming is seen in the NE quadrant with wave.

STEREO: BEACON data
COR2 A,  02:54 UT, an asymmetric halo by 03:39 UT in the West hemisphere. 
Preliminary time/height measure gives 915.1 km/sec velocity at LE.
EUVI A 195, n/a
COR2 B, 02:54 UT, CME over the North and East hemispheres.
EUVI B 195, 02:11-03:11 UT, eruption from region on disk in NW. Flare of the AR11611
which triggers a filament release of a channel east of and adjacent to AR11611. A 
wave and dimming is produced along with flaring of the filament region.

NOAA reports an M1.7 Xray flare 02:08/02:23/02:55 UT from AR 11611 at location [N12,E88]

The observation of this event is considered 'FAIR'. This CME is determined FRONTSIDED.

Images and movies and time/height information for this event is available on the web at:

http://umbra.nascom.nasa.gov/lasco/observations/halo/2012/121108a/

Best regards,

Kevin Schenk
Solar Heliospheric Observatory
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA

BT