SOHO/LASCO HALO CME 111109 UCMEO 93001 11110 1730/ 11109 61336 82006 0481/ 047// 333// 41076 11109 61212 81406 14326 11342 2112/ 99999 PLAIN SOHO/LASCO observed an asymmetric HALO CME on November 9, 2011. Event is first seen in C2 at 13:36 UT with a bright loop front over the NE at PA 48 with loop LE out to 3.2 Rsun at first frame. Bright core material is seen and associated with the halo but also a separate system. Event progressed quickly to a full HALO by 14:12 UT. The event continues into the C3 field beginning 13:54 to 20:06 UT where it leaves C3 FOV at 30 Rsun. Time/height measurements were marked at 4 points in C2 with speeds of 1281.7 Km/sec at position angle 47 degrees. The event is marked to 15 points in C3 where it slightly slows. Speeds average through both fields to 1076.2 Km/sec at PA 49 degrees, acceleration -16.49 m/sec^2. SDO/AIA 193/304 shows a filament activation at 12:12 UT located [N26,E43] NE of AR 11342. The filament erupts then appears to trigger a flare of AR 11342 [N18,E25] producing an impulsive CME. The CME produced a wave over the North and NorthEast hemispheres while a post arcade of the filament brightens. STEREO: Beacon data COR2 B, 13:40-16:55 UT, in the west, a bright loop with cavity and core. Preliminary height/time measure was taken on COR2 B beacon data showing 1366 km/sec. EUVI B 195, 13:06-13:56 UT, AR on West limb with flare and bright ejecta. NOAA reports a M1.1 xray flare of AR 11342 13:04-14:012 UT. This is most probably the cause of the 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/2011/111109/ Best regards, Kevin Schenk Solar Heliospheric Observatory EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT