SOHO/LASCO HALO CME 110804a UCMEO 93001 10804 1800/ 10804 60412 80818 3121/ 311// 323// 41452 10804 60342 80427 43619 11261 1222/ 99999 PLAIN SOHO/LASCO observed an asymmetric HALO CME on August 4, 2011. Event is first seen in C2 at 04:12 UT with bright impulsive front over the WNW measuring at 3.6 Rsun on first frame. A full halo cme with material at all PAs by 04:24 UT. By 06:24 UT, associated rough LE material over the north hemisphere with slow progression, remnants of filament material triggered in the AR burst. The event continues into the C3 field beginning 04:18 to 08:18 UT at 30 Rsun. Time/height measurements were marked at 3 points in C2 with speeds of 1699.4 Km/sec at position angle 312 degrees. The event is marked to 14 points in C3 where it slightly slows. Speeds average through both fields to 1451.7 Km/sec at PA 306 degrees, acceleration -45.3 m/s^. The filament core material was also measured to 12 points in C2 at 837.3 km/sec. Accelerates in C3 and averages through both fields at 913.4 km/sec with acceleration of 17.20 m/s^. SDO/AIA 193 shows a flare of AR 11261 03:42-04:27 UT located at [N19 W36]. This event also produced a AR dimming and a global wave. AIA 304 shows an emission of cooler material triggered from the flare of AR 11261 with north direction. STEREO: COR2 A, 04:24 UT, already in progress, produced and asymmetric HALO Preliminary height/time measure was taken on COR2 beacon data showing 1844.9 km/sec COR2 B, 04:25 UT, already in progress, produced a full asymmetric halo in it's field. Measurements taken on beacon data gave 1532.4 km/sec. EUVI 195 A, flare 03:45-04:35 of AR 11261 on disk in East with a global wave in it's field. NOAA reports a M9.3 xray flare of AR 11261 03:41-04:04 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/2011/110804a/ Best regards, Kevin Schenk Solar Heliospheric Observatory EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT