SOHO/LASCO HALO CME 111127 BACKSIDED

UCMEO 93001 11128 1640/
11127 61400 81854 0952/ 094// 113// 30711
11127 71326 81406 ///// ///// 1112/
99999

PLAIN

SOHO/LASCO observed a HALO CME on November 27, 2011.  Event is
first seen in C2 at 14:00 UT as a faint loop front over the east.
The continues into the C3 field beginning 14:42 to 18:54 UT where it
dissipates at 12.9 Rsun.

Time/height measurements were marked at 5 points in C2 with speeds of 639.0 Km/sec
at position angle 94 degrees. The event is marked to 3 points in C3.  Speeds
average through both fields to 711.3 Km/sec at PA 96 degrees. Acceleration of
9.59 m/sec^2. 

STEREO: Beacon data
COR2 B,  14:25 UT a burst expanding over the east. 
Preliminary time/height measure gives 422.9 km/sec velocity at LE.
EUVI B, 13:26-14:06 UT CME from an AR near east limb on equator line.
COR2 A, 13:54 UT burst expanding over the west field.
Preliminary time/height measure gives 453.5 km/sec velocity at LE.
EUVI A, 13:25 UT, large expanding CME over west limb.


The observation of this event is considered 'FAIR'. 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/2011/111127/

Best regards,

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

BT