Halo CME Mail

Date: Tue, 28 Jan 2003 15:36

From: Gareth Lawrence

Subject: Partial Halo CME on 2003/01/27, frontsided

Status: O

UCMEO 93001 30128 2045/
30127 62223 90409 1271/ 275// 223// 41049
30127 62233 90054 32222 ///// 1212/

LASCO and EIT observed a partial halo CME on 2003/01/27. The 
event was first observed in C2 at 22:23 UT as a bright loop 
front over the S pole; by 23:33 UT the front spanned 148 deg
from PA 127 - 275, with possible extremely faint extensions 
into the NW and NE. The front first appeared in C3 at 22:54 UT 
with maximal coverage of the C3 occultor by 00:54 UT. The mean 
plane-of-sky speed for this event was 1049 km/s at PA 193, 
with a highly linear height-time profile. Please note that
as a result of the special campaign to observe comet C/2002 X5
(Kudo-Fujikawa) the start times are somewhat inaccurate.

The CME was probably most associated with a prominence eruption
observed by EIT between 22:33 - 23:33 UT centered around S22W22. 
SEC records a C2.4 X-ray event at S17W23 (near AR 100267) between 
21:42 - 22:59 UT with peak emission at 22:19 UT; the EIT images
suggest this is due to bright post-eruptive loops. An EIT
dimming was possibly observed in association with this event,
but no wave. Note that the EIT cadence was highly irregular
around this time due to LASCO's comet observations; as a 
result some phenomena and their onset times are hard to identify.

Movies and images of this event are available now at: 

and note that comet C/2002 X5 (Kudo-Fujikawa) is clearly visible 
in the LASCO movies, moving top to bottom in the west. 

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       |
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