SOHO/LASCO HALO CME 121123a UCMEO 93001 21124 1750/ 21123 61336 82230 1331/ 132// 323// 40570 21123 61127 81345 21637 ///// 2212/ 99999 PLAIN SOHO/LASCO observed two (2) HALO CMEs on November 23, 2012. The first event (A) is seen in C2 beginning 13:36 UT with a loop over the SE. The event expands with extensions to a total asymmetric halo by 15:36 UT. The event continues into the C3 field beginning 14:30-22:30 UT out to the edge of field at 30 Rsun in the South. Time/height measurements were marked at 9 points in C2 with speeds of 427.5 Km/sec at pa 134 degrees. The event is marked to 10 points in C3. Speeds average through both fields to 570.3 Km/sec at PA 133 degrees. Acceleration 24.82 m/sec^2. SDO AIA 193 and 304 shows an activated filament channel in the SW quadrant located and centered at [S37, E16]. Filament erupted 11:27-13:45 UT producing a dimming and post loop arcade. STEREO: BEACON data COR2 A, 13:39 UT, expanding loops produce a partial Halo over the East. Preliminary time/height measure gives 481.6 km/sec velocity, acceleration 13.60. EUVI A 195, n/a COR2 B, 13:40 UT, multiple events close in time produce a partial Halo in the West. EUVI B 195, n/a The observation of this event is considered 'GOOD'. 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/2012/121123a Best regards, Kevin Schenk Solar Heliospheric Observatory EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT