SOHO/LASCO Partial HALO CME 120728

UCMEO 93001 20730 2050/
20728 62112 80954 0291/ 246// 123// 30551
20728 62048 82106 25425 11532 1112/
99999

PLAIN

SOHO/LASCO observed a partial HALO CME on July 28, 2012.  Event is first seen in
C2 beginning 21:12 UT with a loop over the SE.  The event expands with extensions
PA 29 - 246 for a total width of 217 degrees wide.  The event continues into the
C3 field beginning 12:42-09:54 UT out to the edge of field at 30 Rsun in the Southeast.

Time/height measurements were marked at 6 points in C2 with speeds of
668.2 Km/sec at pa 118 degrees. The event is marked to 9 points in C3.  
Speeds average through both fields to 551.4 Km/sec at PA 118 degrees.
Acceleration -25.33 m/sec^2. 

SDO AIA 193 shows a flare of AR 11523 23:48-21:06 UT located [S25,E54].
A dimming is seen in the SE quadrant with wave.
SDO AIA 304 shows activated prominence material on SW limb erupting by 18:48 UT
and may be associated with the cme.

STEREO: BEACON data
COR2 A,  21:24 UT, an expanding loop over the southeast.
Preliminary time/height measure gives 616.7 km/sec velocity at LE.
EUVI A 195, 20:45 UT flare starts from AR 11532 over SE limb. Data gap 20:45-21:15 UT
COR2 B, 19:24-23:54 UT Data gap. CME over the west and southwest at edge of field
at the first frame.
EUVI A 195, 19:06-00:06 UT data gap.  n/a

NOAA reports an M6.1 Xray flare 20:44-20:56-21:04 UT from AR 11532 at location [S25,E54]

The observation of this event is considered 'FAIR'. This CME is determined FRONTSIDED.

Images and movies and time/height information for this event is available on the web at:

http://umbra.nascom.nasa.gov/lasco/observations/halo/2012/120728/

Best regards,

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

BT