Subject: SOHO/LASCO Partial HALO CME 110303 UCMEO 93001 10303 1800/ 10303 60548 81406 0861/ 263// 313// 30247 10303 ///// ///// ///// ///// ///// 99999 PLAIN SOHO/LASCO observed a partial HALO CME on March 03, 2011. Event is first seen in C2 at 05:48 UT as a faint but defined expanding LE loop system followed by interior multi loop cores over the southern hemisphere. The event continues into the C3 field beginning 08:30 to 14:06 UT where the event fades at approximately 12 Rsun. Time/height measurements were marked to 14 points in C2 with speeds of 175.2 Km/sec at position angle 174 degrees. The event accelerates in C3, marked at 10 points. Speeds average through both fields to 246.9 Km/sec at PA 177 degrees with acceleration of 8.16m/sec^2. Difficult event. COR2 A shows precursor of a streamer event at 04:30 UT with a CME beginning at 05:54 UT in it's east field. This will make the event a Earth directed CME. COR1 B shows the same CME in it's west field beginning 05:05 UT. AIA shows no apparent evidence of a disk event which is related to timings in STEREO or LASCO at this time. Some call this type of event a Stealth CME. The observation of this event is considered 'FAIR'. 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/2011/110303/ Best regards, Kevin Schenk Solar Heliospheric Observatory EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT