Subject: SOHO/LASCO HALO CME 120708 BACKSIDED

UCMEO 93001 21003 1630/
20708 61448 82130 0612/ 060// 123// 40614
20708 61340 81450 ///// ///// 1112/
99999

PLAIN

SOHO/LASCO observed a full HALO CME on July 08, 2012.  Event is
first seen in C2 at 14:48 UT as an asymmetric halo CME.
The event continues into the C3 field beginning 15:18 to 21:30 UT
where it dissipates at 21.5 Rsun.

Time/height measurements were marked to 5 points in C2 with speeds 
of 688.9 Km/sec at position angle 61 degrees. The event is marked to 10 points 
in C3. Speeds average through both fields to 613.9 Km/sec at PA 61 degrees.  
Acceleration -37.12 m/sec^2.

SDO/AIA n/a 

STEREO: Beacon data
COR2 A, 14:24 UT as a loop expanding over the west hemisphere. Develops to
partial halo event.
Preliminary time/height measure gives 1201.2 km/sec velocity at LE. 
EUVI A, 13:55-14:350 UT flare from AR on disk in SW with dimming and wave. 
COR2 B, 14:39 UT, loop expanding with extensions over the East.
Preliminary time/height measure gives 934.8 km/sec velocity at LE. 
EUVI B, 13:40-14:35 UT flare from AR on disk at [S12, E171] producing a
dimming and wave.

   
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/2012/120708/

Best regards,

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

BT