Subject: SOHO/LASCO HALO CME 120702 BACKSIDED

UCMEO 93001 20702 2100/
20702 60836 81254 0972/ 096// 323// 31203
20702 60745 80835 ///// ///// 1222/
99999

PLAIN

SOHO/LASCO observed a full HALO CME on July 2, 2012.  Event is
first seen in C2 at 08:36 UT as a bright expanding loop with cavity over
the SE.  The event is an asymmetric halo (east) by 10:12 UT.
The event continues into the C3 field beginning 09:06 to 12:54 UT out to
27 Rsun at last frame before a DSN gap period.

Time/height measurements were marked to 2 points in C2 with speeds 
of 1182.0 Km/sec at position angle 97 degrees. The event is marked to 9 points 
in C3. Speeds average through both fields to 1202.6 Km/sec at PA 97 degrees.  
Acceleration -17.29 m/sec^2.

SDO/AIA 193 shows material from a cme beginning 07:57-08:33 UT over the east
limb south of the equator.

STEREO: Beacon data
COR2 B, 08:54 UT a symmetric halo which appears a multi part emission.
Preliminary time/height measure gives 841.1 km/sec velocity at LE. 
EUVI B, 07:45-08:35 UT flare from AR on disk in SE [S19, E132]. 
COR2 A, 08:54-11:24 UT data gap. 
EUVI A, 08:45-11:15 UT data gap.  A cme from over the west limb 07:55-08:25 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/2012/120702/

Best regards,

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

BT