Date: Mon, 3 Feb 2003 17:11
From: Gareth Lawrence
Subject: Partial Halo CME on 2003/02/01, possibly fronsided
Status: O
UCMEO 93001 30203 2215/
30201 60939 90845 2551/ 040// 222// 40589
///// ///// ///// ///// ///// /////
99999
PLAIN
BT
LASCO observed a possible partial halo CME on 2003/02/01. The
event was first observed in C2 at 01:51 UT as ragged loop
front systems over the NW limb and N pole a significant way
into C2's field of view. The two systems appear distinct
but there is insufficient data to rule out the possiblility
of a connection. The total span of the system is about
145 deg, from PA 255 - 40. These fronts first appeared in
C3 at 02:20 UT but additionally with evidence of a leading
edge some way ahead of the NW limb fronts only. The mean
plane-of-sky speed for the system was 589 km/s at PA 282,
with insufficient data to infer acceleration, or lack
thereof. Only C3 data were used to measure this speed.
EIT had begun a routine CCD bakeout by this time, so no
on-disk EUV data are available. However, GOES recorded a
Type II radio burst from 22:09 UT on 2003/01/31 which
could have been associated with a frontsided source.
In light of the ambiguity in the data we conclude there
is a possibility that this event has an earthward-directed
component.
Movies and images of this event are available now at:
ftp://ares.nrl.navy.mil/pub/lasco/halo/20030131
Some people may experience difficulties obtaining the images and
movies at present; this is due to unresolved issues with the
firewall at NRL. Aplogies to those affected; the problem is being
worked on.
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 001, +1-301-286-3447 |
| Greenbelt, MD 20771. Fax: +1-301-286-0264 |
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