Subject: SOHO/LASCO Partial HALO CME 110614

UCMEO 93001 10614 1713/
10614 60612 81842 3351/ 169// 323// 40457
10614 60327 80903 25110 ///// 3212/
99999

PLAIN

SOHO/LASCO observed a Partial HALO CME on June 14, 2011.  Event is first seen in
C2 at 06:12 UT as faint developing loop at PA 109 degrees followed by multiple cores.
The front expands with extensions PA 335-169 degrees for a total coverage of
194 degrees over the East hemisphere. The event continues into the C3 field
beginning 08:30 to 18:42 UT out to the edge of view at 30 Rsun.

Time/height measurements were marked at 17 points in C2 with speeds of 200.5 Km/sec
at position angle 104 degrees. The event is marked to 31 points in C3 where it
accelerates.  Speeds average through both fields to 456.6 Km/sec at PA 101 degrees.
Acceleration of 22.96 m/sec^s.

SDO/AIA shows elevated prominence material ESE limb  00:33 UT.  Eruption begins approximately
03:27 - 09:03 UT on disk as dimmings centered near [S10, E51] along with post arcading.    
STEREO EUVI B beacon data shows dimmings beginning at 04:25 in the SW field and the dramatic
post finish.  COR2 B beginning 08:10 UT a large loop over it's West limb with emission
expanding over the west and south hemispheres.

This is most probably the cause of the Partial HALO event seen in LASCO.

   
The observation of this event is considered 'GOOD'. This CME is determined a FRONTSIDED 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/2011/110614/

Best regards,

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

BT