UCMEO 93001 20220 2230/
20219 62057 80406 2252/ 109// 113// 20579
/////  ///// ///// ///// ///// 5////
99999

PLAIN

SOHO/LASCO observed a partial HALO CME on February 19, 2012.  Event is
first seen in C2 at 20:57 UT with a loop expanding over the North pole
with extensions spanning the north hemisphere from pa 225-109 degrees
totaling 244 degrees in width. The event continues into the C3 field 
beginning 21:30-04:06 UT where the event dissipates in C3 at 26 Rsun in the NNE.

Time/height measurements were marked at 5 points in C2 with speeds of 672.2 Km/sec
at position angle 12 degrees. The event is marked to 9 points in C3.  Speeds
average through both fields to 579.3 Km/sec at PA 12 degrees. Acceleration of
-8.84 m/sec^2. 

SDO AIA:  193A and 304A both show an eruption over the NW limb at 16:27-19:128 UT.
There was also low scale activity from an AR in the NE of an un-numbered region
located at [N18,E04] small flares at 19:48 and 20:18 UT.  No apparent results 
with the CME seen in Lasco.

STEREO: Beacon data
COR2 A, 19:39-05:24 UT data gap. 
EUVI A 195, 16:25-18:55 UT Filament eruption on disk in North near central meridian.
COR2 B, 18:55-23:40 UT data gap.
EUVI B 195, 19:16-23:06 UT data gap.  18:26-19:16 where data gap began, a cme from a region
near the North East limb.  Only 3 frames showing activity. 

At this time there is no conclusive evidence proving direction from STEREO beacon data.
The observation of this event is considered 'POOR'. 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/2012/120219/

Best regards,

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

BT