Subject: SOHO/LASCO HALO CME 110215 UCMEO 93001 10215 1800/ 10215 60236 81130 2111/ 210// 323// 40748 10215 60148 80154 31821 11158 1112/ 99999 PLAIN SOHO/LASCO observed a HALO CME on February 15, 2011. Event is first seen in C2 at 02:36 UT as a full bright LE loop which encompassed the occulting disk and producing a symmetric full 360 degree HALO CME. The event continues into the C3 field with material still surrounding the occulter beginning 03:06 to 11:30 UT out to approximately 25 Rsun as the event dissipates. Time/height measurements were marked to 4 points in C2 with speeds of 788.5 Km/sec at position angle 213 degrees. The event is marked to 15 points in C3 where it slightly decelerates. Speeds average through both fields to 747.8 Km/sec at PA 211 degrees. SDO/AIA shows a bright flare of AR 11158 located at [S21, W18] on disk begining 01:48-01:54 UT. This flare produced an almost global AIA wave. NOAA reports an X2.2 Xray flare of AR 11158 beginning at 01:44-01:56 UT. This is most probably the cause of the full 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/2011/110215/ Best regards, Kevin Schenk Solar Heliospheric Observatory EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT