SOHO/LASCO HALO CME 121121

UCMEO 93001 21124 1540/
21121 61600 80230 1381/ 137// 323// 30672
21121 61512 81548 10108 11618 1122/
99999

PLAIN

SOHO/LASCO observed a full symmetric HALO CME on November 21, 2012.  Event is first seen
in C2 beginning 16:00 UT with a faint loop with over the South pole.  The event 
expands to a full halo by 16:36 UT.  The event continues into the  C3 field beginning
16:30-02:30 UT out to the edge of field at 30 Rsun in the Southeast.

Time/height measurements were marked at 6 points in C2 with speeds of
655.3 Km/sec at pa 138 degrees. The event is marked to 10 points in C3.  
Speeds average through both fields to 672.1 Km/sec at PA 138 degrees.
Acceleration -08.30 m/sec^2. 

SDO AIA 193 shows a flare of AR 11618 at location [N08,E01] 15:12-15:48 UT.  This flare
produces an expanding wave.

STEREO: BEACON data
COR2 B, 16:25 UT in first frame, loop over the West.  Only 1 frame before data gap till 00:40 UT.
EUVI B 195,  n/a
COR2 A,  14:54-20:24 UT Data gap. n/a
EUVI A 195,  n/a


NOAA reports a M3.5 Xray flare 15:10-15:30-15:38 UT from AR 11618.

The observation of this event is considered 'FAIR'. This CME is determined FRONTSIDED.

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

http://umbra.nascom.nasa.gov/lasco/observations/halo/2012/121121/

Best regards,

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

BT