SOHO/LASCO Partial HALO CME 111206 BACKSIDED

UCMEO 93001 11206 1430/
11206 61000 91255 1912/ 048// 323// 40532
11206 60905 81015 ///// 11360 4212/
99999

PLAIN

SOHO/LASCO observed a partial HALO CME on December 6, 2011.  Event is
first seen in C2 at 10:00 UT as an expanding loop front with extensions 
over the west and north. The approximate width of the CME spans pa 191-48 
degrees totaling 217 degrees wide. The event continues into the C3 field
beginning 10:54-12:55 UT to 11.9 Rsun at last image while event is still in progress.

Time/height measurements were marked at 7 points in C2 with speeds of 521.3 Km/sec
at position angle 292 degrees. The event is marked to 5 points in C3.  Speeds
average through both fields to 531.7 Km/sec at PA 287 degrees. Acceleration of
0.31 m/sec^2. 

SDO AIA 193 shows an expanding loop cme over the NW limb beginning 09:33 UT.
STEREO: Beacon data
COR2 B,  10:25-11:40 UT cme over east and north hemispheres.  
Preliminary height/time measure was taken on COR2 B beacon data showing 667.0 km/sec.
EUVI B 195, 06:26-10:26 UT data gap.
COR2 A, 10:24-11:54 UT partial halo cme over north and west fields.
Preliminary height/time measure was taken on COR2 A beacon data showing 575.0 km/sec.
EUVI A 195, dimming from AR in NW 09:05-10:15 UT. (AR 11360)

The observation of this event is considered 'GOOD'. This CME is determined a BACKSIDED event.

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

http://umbra.nascom.nasa.gov/lasco/observations/halo/2011/111206/

Best regards,

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

BT