Halo CME Mail Date: Mon, 19 Nov 2001 14:03 From: Gareth Lawrence Subject: Full Halo CME on 2001/11/17 ------------------------------------------------------------------------ UCMEO 93001 11119 1900/ 11117 70530 91023 0001/ 360// 233// 41173 11117 60324 90624 24213 09704 1222/ 99999 PLAIN BT LASCO and EIT observed a full halo CME on 2001/11/17. The event was first observed in C2 at 05:30 UT as a fast, bright loop front over the E limb; by 05:54 UT the C2 occulting disk was surrounded, though emission in the W was faint. The front first appeared in C3 at 05:42 UT with full coverage of the C3 occultor by 06:42 UT. The plane of sky speed of the front was measured as 1173 km/s at PA 59 (NE) with some deceleration through the coronagraphs' fields of view. The CME was most probably associated with an eruptive filament that was soon followed by an M2.8 X-ray flare. The filament was observed lifting off by EIT between 03:24 - 05:36 UT, and the flare was observed between 05:24 - 06:24 UT with peak emission at 05:35. Note that EIT's cadence was rather uneven during this period, and in particular the start time for the flare may not be reliable. GOES observed the flare between 04:49 - 06:11 UT with peak emission at 05:25. SEC records the flare from AR9704, centered on S13E42. Note also that the region from which the filament appeared to originate is somewhat to the N and E of this, centered around S04E47. Neither an EIT wave nor a dimming were observed in association with this event. Images and movies of this event are available at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20011117 Best wishes, Gareth Lawrence. ++ | Gareth Lawrence, E-mail:grl@kreutz.nascom.nasa.gov | | SOHO-LASCO Operations Scientist, | | CUA, Mail Code 682.3, | | NASA Goddard Space Flight Center, Phone: +1-301-286-2941 | | Building 26, Room G-1, +1-301-286-3447 | | Greenbelt, MD 20771. Fax: +1-301-286-0264 | ++