Date: Wed, 27 Aug 2003 16:53
From: Gareth Lawrence
Subject: Partial Halo CME on 2003/08/25, probably frontsided
Status: O
UCMEO 93001 30827 2115/
30825 60127 92142 1001/ 140// 223// 40308
30825 60212 80300 24111 10442 1112/
99999
PLAIN
BT
LASCO/EIT observed a wide partial halo CME on 2003/08/25. The
event was first observed in C2 data at 01:27 UT as a system
of faint loop fronts rising along a streamer in the SW; this
front spanned 140 deg from PA 100 - PA 240 by 03:06 UT. The
front first appeared in C3 at 09:18 UT with maximal coverage
of the C3 occultor by 19:00 UT. The mean plane-of-sky speed
for this event was 308 km/s at PA 185, with moderate
acceleration.
EIT observed an C3.6 X-ray flare between 02:12 - 03:00 UT with
peak emission at 02:36 UT. The source of the flare was AR 0442
centered on S11E41. A separate CME probably associated with
this flare can be seen in LASCO images along the streamer in
the SE from 03:26 UT; afterwards the slow fronts in the SW
appear to span over the S pole and to the vicinity of this
streamer. Note that the faint fronts had been visible in the SW
for a considerable time prior to the flare in the SE. A modest
EIT wave and dimming were observed in association with this event,
primarily to the W of the AR. This event has therefore been
determined probably frontsided.
Movies and images of this event will shortly available at:
ftp://ares.nrl.navy.mil/pub/lasco/halo/20030825
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
+