UCMEO 93001 20223 2030/
20223 60812 91718 2071/ 053// 333// 40553
20223 60735 80855 49524 ///// 2112/
99999

PLAIN

SOHO/LASCO observed a partial HALO CME on February 23, 2012.  Event is
first seen in C2 at 08:12 UT as an expanding loop with cavity and core
material over the NW.  Measure from extensions pa 207 to 53 degrees for
206 degrees total width.  The event continues into the C3 field
beginning 09:06-17:18 UT at last frame with LE at 23 Rsun in the NW.

Time/height measurements were marked at 8 points in C2 with speeds of 506.3 Km/sec
at position angle 301 degrees. The event is marked to 13 points in C3.  Speeds
average through both fields to 552.9 Km/sec at PA 303 degrees. Acceleration of
8.21 m/sec^2. 

SDO AIA: 193 shows a CME limb event 07:36-09:30 UT with minimal material wave
from the limb in the NW near AR 11419 followed by post loop arcade.
STEREO: Beacon data
COR2 A, 08:39-12:54 UT, expanding front with cavity and core over the East.
Preliminary height/time measure was taken on COR2 A beacon data showing 478.7 km/sec.
EUVI A 195, 07:35-08:55 UT, filament eruption of channel adjacent to AR 11419
in the NE of the field of view.  Event produced a large dimming with wave westward.
COR2 B, 07:55-11:25 UT data gap.
EUVI B 195, n/a


The observation of this event is considered 'GOOD'. This CME is determined a LIMB event.
Material is emitted to the front with the majority spanning the back.

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

http://umbra.nascom.nasa.gov/lasco/observations/halo/2012/120223/

Best regards,

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

BT