UCMEO 93001 20225 1730/
20224 60346 81010 3151/ 314// 223// 40593
20224 60206 80712 12814 ///// 2212/
99999

PLAIN

SOHO/LASCO observed a HALO CME on February 24, 2012.  Event is first seen in
C2 at 03:46 UT as a bright core over the north pole at 3.3 Rsun in first frame.
The front develops to a full halo with an expanding loop.  A faint second loop
system expands over the south hemisphere beginning 07:15 UT.  This is most probably
a partial halo 196 degrees wide from pa 111-307 degrees.  
The event continues into the C3 field beginning 04:12 to 10:10 UT out to 30 Rsun
in the North.

Time/height measurements were marked to 7 points in C2 with speeds of 570.1 Km/sec
at position angle 314 degrees. The event is marked to 7 points in C3.  Speeds average
through both fields to 593.2 Km/sec at PA 314 degrees.  Acceleration -2.38 m/sec^s.


SDO/AIA 193 and 304 shows elevated filament material along a channel in the NE centered 
at location [N25,E28] eruption begins 02:06-07:12 UT with post loop arcade.

STEREO: Beacon data
COR2 B, 03:55-06:55 UT large expanding loop over the west hemisphere.
Preliminary time/height measure gives 779.2 km/sec velocity at LE. 
EUVI B, 2/23 19:16-23:16 UT data gap. Loop arcade seen over the NW limb.
COR2 A, 2/23 22:54-05:24 UT data gap.  In progress, beginning 05:24 UT large loop 
CME event expanding over the east hemisphere.
EUVI A, 2/23 22:55-05:15 UT data gap.

   
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/2012/120224ab/

Best regards,

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

BT