SOHO/LASCO HALO CME 111207 BACKSIDED

UCMEO 93001 11207 2030/
11207 60936 81554 2892/ 288// 123// 40586
11207 60825 80915 ///// ///// 3212/
99999

PLAIN

SOHO/LASCO observed a HALO CME on December 7, 2011.  Event is
first seen in C2 at 09:36 UT as a multi-loop system over the west
and north. The cme expands to a full halo by 10:24 UT.
The event continues into the C3 field beginning 10:06-15:54 UT
to 23.4 Rsun where it dissipates.

Time/height measurements were marked at 5 points in C2 with speeds of 632.3 Km/sec
at position angle 289 degrees. The event is marked to 7 points in C3.  Speeds
average through both fields to 585.6 Km/sec at PA 292 degrees. Acceleration of
-43.21 m/sec^2. 

SDO AIA 193 shows a small eruption of filament material 09:27-09:54 UT located
[N18,E33], east and adjacent to AR 11366. This material appears to be related.
STEREO: Beacon data
COR2 B,  06:40-11:25 UT gap.  In progress cme over east hemisphere.  
COR2 A, 09:24-12:54 UT expanding loop with cavity and core material over west fields.
Preliminary height/time measure was taken on COR2 A beacon data showing 776.4 km/sec.
EUVI A 195, cme with liftoff of elevated prominence on NW limb 08:25-09:15 UT. 


The observation of this event is considered 'GOOD'. 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/2011/111207/

Best regards,

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

BT