UCMEO 93001 301028 1500/ 31028 61054 91420 0001/ 360// 233// 42125 31028 61036 91212 20916 10486 1111/ 99999 PLAIN BT LASCO and EIT observed a full halo CME on 2003/10/28. The event was first observed in C2 at 10:54 UT as a bright loop front over the W limb; by 11:30 UT the front had developed into a full halo CME, very bright all around the occulting disk. The front first appeared as a full halo CME in C3 images at 11:42 UT. The mean plane-of-sky speed for this event was 1785 km/s at PA 92, with evidence for strong acceleration below 5Rs. The height-time profile above 5Rs is moderately linear and has a mean plane-of-sky speed of 2125 km/s The CME was probably associated with an X17.2 X-ray flare observed by EIT between 10:36 - 12:012 UT, centered at S16E09 with peak emission at 11:12 UT. GOES records this flare from AR 0486 between 09:51 - 11:24 UT with peak emission at 1110 UT. A very large EIT wave, and dimming, were observed in association with this event. This event has therefore been determined frontsided. Please note that a large prominence can be seen erupting slightly below the active region prior to the flare, and this prominence material can clearly be seen in LASCO images, to the S. Movies and images of this event will shortly be available at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20031028 and note that all images after 13:00 UT, particularly C3, are severely degraded due to the ongoing proton storm. Best wishes, Gareth Lawrence. +----------PLEASE NOTE NEW EMAIL ADDRESS-----------+ Gareth Lawrence, grl@grace.nascom.nasa.gov SOHO-LASCO Operations Scientist, CUA, MC 682.3, Bldg 26, Rm 001, F: +1-301-286-0264 NASA Goddard Space Flight Center, Greenbelt, MD 20771. P: +1-301-286-2941 +--------------------------------------------------+