SOHO/LASCO HALO CME 111113 BACKSIDED

UCMEO 93001 11114 1830/
11113 61836 80318 0702/ 069// 223// 31030
///// ///// ///// ///// ///// /////
99999

PLAIN

SOHO/LASCO observed a HALO CME on November 13, 2011.  Event is
first seen in C2 at 18:36 UT as a rough front over the north pole.
The event is a full HALO CME by 19:24 UT and appears to be 2 loop
systems showing a slight speed difference in expansion.  The event
continues into the C3 field beginning 19:18 to 03:18 UT where it
dissipates at 25 Rsun.

Time/height measurements were marked at 6 points in C2 with speeds of 900.7 Km/sec
at position angle 30 degrees. The event is marked to 11 points in C3 where it
accelerates.  Speeds average through both fields to 1030.1 Km/sec at PA 25 degrees. 

SDO/AIA 193 shows no evidence of this event.
STEREO: Beacon data
COR2 B, data gap 17:40-21:25 UT, after gap show material over east in progress. The
LE already near edge of FOV.
EUVI B 195, data gap 17:46-21:26 UT, 17:06, darkening of 2 near adjacent ARs in NE.
Possible post loop arcading seen after gap at 21:26 UT.
COR2 A and EUVI A data gap 17:24-03:24 UT

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/2011/111113/

Best regards,

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

BT