SOHO/LASCO Partial HALO CME 111226

UCMEO 93001 11227 1715/
11226 61148 82130 2041/ 113// 323// 40497
11226 61103 81151 40426 ///// 2112/
99999

PLAIN

SOHO/LASCO observed a partial HALO CME on December 26, 2011.  Event is
first seen in C2 at 11:48 UT as a faint loop front over the north pole which
expands and develops multi-loops with cavity and core material.
The approximate width of the CME spans pa 204-113 degrees totaling 269 degrees wide.
The event continues into the C3 field beginning 12:18-21:30 UT to 27 Rsun.

Time/height measurements were marked at 5 points in C2 with speeds of 593.1 Km/sec
at position angle 281 degrees. The event is marked to 11 points in C3.  Speeds
average through both fields to 497.4 Km/sec at PA 283 degrees. Acceleration of
-6.54 m/s^2. 

SDO AIA 193 shows a dual ribbon eruption of a filament area located [N26,W04] 
northeast and adjacent to AR 11384 beginning 11:03-11:51 UT with faint dimming,
wave, and bright post arcade. 
STEREO: Beacon data
EUVI B, CME over limb in NW 11:06-12:16 UT with post arcade.
COR2 B,  loop beginning 12:10 UT expanding over west, northwest hemisphere.
EUVI A, large burst in NE on limb beginning 11:15-12:05 UT.
COR2 A, bright expanding loop beginning 11:54 UT.  CME over east hemisphere.


The observation of this event is considered 'GOOD'. This CME is determined a FRONTSIDED 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/2011/111226/

Best regards,

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

BT