Halo CME Mail Date: Mon, 24 Sep 2001 22:20:45 +0000 (GMT) From: Kevin Schenk Subject: Full HALO CME on 2001/09/24 ------------------------------------------------------------------------ UCMEO 93001 10924 2100/ 10924 71030 91442 1051/ 104// 333// 52231 10924 60912 81400 22718 09632 4122/ 99999 BT All EIT and Lasco observed a full HALO CME on 2001/09/24. The event first seen in C2 at 10:30 UT Monday Sept 24, 2001 as a large loop front over the SE limb at PA 120 degrees. At this time it was approx 2.5Rs into the field. Due to the speed we only have one (1) frame to calculate with. C3 sees the event at 10:42 UT with the front over the same area developing to a full 360 degrees with a core and cavity over the East hemisphere. The "averaged" plane-of-sky speed through both C2 and C3 gives 2220 km/sec at PA 105 degrees. This was showing acceleration through C3. This event produced Proton emission seen in the white light images. EIT observed a CME starting in AR9632 located at [S18; E27] at 09:12 UT. As a typical eruption was in progress an x-ray flare occured in the same region with first frame at 10:14 UT and a X2.6 class flare is reported in GOES at this time. A large bright event with a SSE progression and EIT wave seen along North and South directions. Later, an expanding arcade of post loops are active till 14:00 UT. This event is probably associated with the HALO CME seen in Lasco. Images and movies are available on the Lasco FTP servers at: ftp://ares.nrl.navy.mil/pub/lasco/halo/20010924/ Best Reguards, Kevin Schenk EIT and LASCO Operations NASA-Goddard Space Flight Center, USA