SOHO/LASCO Partial HALO CME 110907b UCMEO 93001 10908 1730/ 10907 62305 81054 1591/ 073// 323// 40742 10907 62236 82339 42814 11283 1112/ 99999 PLAIN SOHO/LASCO observed a partial HALO CME on September 7, 2011. Event is first seen in C2 at 23:05 UT with a faint wide front over the NW and W along with a bright core centered at pa 325. The event continues into the C3 field beginning 00:06 to 10:54 UT out to 28 Rsun. Time/height measurements were marked at 4 points in C2 with speeds of 807.6 Km/sec at position angle 254 degrees. The calculation was not on the core but on the rough leading front. The event is marked to 5 points in C3 where it slightly slows. Speeds average through both fields to 742.4 Km/sec. SDO/AIA 193 shows a flare of AR 11283 22:36-23:39 UT located at [N14 W28] with a wave over the north and west hemispheres. Filament material erupts W and N with channels triggered from the flaring of AR 11283. STEREO: COR2 A, 22:54 UT, in east expanding. Preliminary height/time measure was taken on COR2 A beacon data showing 681.1 km/sec. COR2 B, 23:40 UT, in the west. Preliminary height/time measure was taken on COR2 B beacon data showing 623.1 km/sec. EUVI 195 A, 22:35-23:15, flare and CME with visible core from AR on limb in East. NOAA reports a X1.8 xray flare of AR 11283 22:32-22:44 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/2011/110907b/ Best regards, Kevin Schenk Solar Heliospheric Observatory EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT