Halo CME Mail

Date: Wed, 3 Dec 2003 18:53

From: Gareth Lawrence

Subject: 'Full' Halo CME on 2003/12/02, frontsided

Status: O

UCMEO 93001 31203 2300/
31202 61026 91442 0001/ 360// 223// 41234
31202 60900 91048 36613 10508 3212/

LASCO and EIT observed a 'full' halo CME on 2003/12/02. A  
bright loop front was seen in C2 at 10:26 UT in the SW;
by 11:06 UT this bright front spanned ~150 deg from the 
S pole to the NW and had faint extensions arounding the 
rest of the C2 occultor. The front first appeared in C3 
images in the SW at 11:18 UT and was bright from the S to 
NW with faint extension elsewhere by 12:18 UT. The mean 
plane-of-sky speed was 1234 km/s, measured at PA 271 with 
possible evidence for acceleration through the C2 field
of view but highly linear through C3.

The CME was probably associated with complex solar activity.
Between 09:00 - 11:12 UT EIT observed an eruptive prominence
in the SW, accompanied by two separate flares. SEC records 
two flares from AR 0508 between 09:40 - 09:54 UT and 
12:47 - 13:22 UT, of magnitude C7.2 and M1.4. Additionally
there was an earlier C3.9 flare from the same active region
between 07:57 - 08:17 UT. The EIT prominence was centered
about S13W65. A substantial dimming was observed to the N 
and E of the prominence, centered around N20W12 and 
coincidentally timed. This event has therefore been 
determined frontsided.

Images and movies will shortly be made available at  


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