SOHO/LASCO HALO CME 120229ab BACKSIDED UCMEO 93001 20229 1930/ 20229 60912 91554 2872/ 286// 323// 30588 20229 60845 80935 ///// 11420 1112/ 99999 PLAIN SOHO/LASCO observed an asymmetric HALO CME on February 29, 2012. Event is first seen in C2 at 09:12 UT as a loop on the west limb. The loop expands with extensions to a full halo cme. A second event following is seen in C2 beginning 12:00 UT. The system expands with extensions as a partial halo 179 degrees wide from pa 208-27 degrees. The event continues into the C3 field beginning 09:42 to 15:54 UT at last frame before a DSN gap period out to 22 Rsun in the northwest. Time/height measurements were marked to 5 points in C2 with speeds of 729.3 Km/sec at position angle 287 degrees. The event is marked to 13 points in C3. Speeds average through both fields to 587.5 Km/sec at PA 289 degrees. Acceleration -19.57 m/sec^s. SDO/AIA 193 shows a CME event over the west limb 08:48-09:24 UT STEREO: Beacon data COR2 A, 09:24-13:39 UT a full halo cme. A second full halo is seen beginning 12:24 UT. Preliminary time/height measure gives 551.0 km/sec velocity at pa 290 degrees. EUVI A, 08:45-09:35 UT flare of AR 11420(?) in the NW with dimming and wave over the west hemisphere. At 11:45-12:45 UT a flare from AR 11422(?) in the NW near central meridian with dimming and small wave southward. COR2 B, 09:25-13:25 UT expanding cme over the East hemisphere. Preliminary time/height measure gives 584 km/sec velocity at pa 79 degrees. EUVI B, 08:56-09:26 UT. A cme is seen coming from behind east limb. 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/2012/120229ab/ Best regards, Kevin Schenk Solar Heliospheric Observatory EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT