Subject: SOHO/LASCO Partial HALO CME 130418 UCMEO 93001 30419 1800/ 30418 61824 80432 1821/ 027// 323// 30571 30418 61757 81830 49410 11719 1112/ 99999 PLAIN SOHO/LASCO observed a Partial HALO CME on April 18, 2013. Event is first seen in C2 at 18:24 UT as a loop appearing on the West. The front expands with extensions PA 182-27 degrees for total coverage of 205 degrees in width. The event continues into the C3 field beginning 19:06 to 04:32 UT leaving the C3 field of view at 30Rsun in the West hemisphere. Time/height measurements were marked to 7 points in C2 with speeds of 545.3 Km/sec at position angle 285 degrees. The event is marked to 13 points in C3. Speeds average through both fields to 571.4 Km/sec at PA 285 degrees. Acceleration 0.54 m/sec^s. SDO/AIA 193A shows a flare on the West limb above the equator 17:57-18:30 UT. This event produces a wave and dimming over the Northwest quadrant followed by a post arcade. The flare comes from AR11719 located [N10,W94]. STEREO: BEACON Data COR2 A, 15:24-19:54 UT data gap. expanding partial halo burst over the East hemisphere. Preliminary time/height measure gives 699.6 km/sec velocity at LE. EUVI A, 15:35-19:55 UT data gap. n/a COR2 B, 18:54-21:54 UT data gap. Symmetric halo in progress with first frame at 21:54 UT. Preliminary time/height measure gives 811.0 km/sec velocity at LE. EUVI B, n/a NOAA reports a long duration C6.5 Xray flare of AR 11719 17:56/18:23/19:04 UT. The observation of this event is considered 'FAIR'. This CME is determined a LIMB event. This event shows signs of material associated with the wave on the frontside. Images and movies and time/height information for this event is available on the web at: http://umbra.nascom.nasa.gov/lasco/observations/halo/2013/130418/ Best regards, Kevin Schenk Solar Heliospheric Observatory EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT