Subject: SOHO/LASCO Partial HALO CME 101214 UCMEO 93001 01214 2215/ 01214 61536 91700 2121/ 144// 322// 40617 01214 61404 81653 45516 11133 1112/ 99999 PLAIN SOHO/LASCO observed an asymmetric partial HALO CME on December 14, 2010. Event is first seen in C2 at 15:36 UT as a bright leading edge loop over the North West. Faint material expands both directions from the loop extending to position angle 212 - 144 degrees totaling 292 degrees wide. The event is seen in first frame of C3 at 16:18 UT. C3 only had 3 frames till 16:54 Ut where SOHO went to a gap in DSN contact at 17:00 UT. The event was still in progress. Time/height measurements are made in the C2 field at 6 points from 2.5 - 6.7 Rsun. This calculated an average speed of 617.6 km/sec at PA 323 degrees. GOES claims a C2.3 class xray flare from AR 11133 at 15:03-16:55 UT. SDO AIA 193A shows a filament eruption beginning at 14:04 UT north of AR 11133 at [N16, W55] with flare activity of AR 11133 begining at 15:04 - approximately 16:53 UT and a wave in the westward direction. In AIA 304 the filament breaks in the north/south direction which can explain the expansion of the fainter materials in C2. The cooperation of these events are most probably the cause of the 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/2010/101214/ Best regards, Kevin Schenk Solar Heliosperic Observatory (SOHO) EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT