Halo CME Mail

Date: Fri, 12 Sep 2003 17:53

From: Gareth Lawrence

Subject: Partial Halo CME on 2003/09/11, frontsided

Status: O

UCMEO 93001 30912 2300/
30911 62206 91018 1261/ 297// 233// 40386
30911 62048 92324 2//// ///// 2112/

LASCO and EIT observed a partial halo CME on 2003/09/11. A narrow 
bright loop was first seen in C2 at 22:06 UT in the SE; by 00:30 UT 
the front spanned ~170 deg from PA 126-297, though faint in the W.
The front first appeared in the SE in C3 images at 23:18 UT and 
reached its maximal extent by 03:18 UT. The mean plane-of-sky speed 
was 386 km/s, measured at PA 170 with no compelling evidence for

The CME was probably associated with an eruptive filament which EIT
observed primarily between 20:28 - 23:24 UT, though the reorganisation
of the affected region of the low corona continued for a substantial
period thereafter. The filament extended from S16E24 - S16W11. SEC
records a B7.9 X-ray flare between 20:16 - 00:08 UT with peak emission 
at 22:37 UT, which may be associated with this eruption (no spatial
information is given). Both a wave and dimming were observed in
conjunction with this event.

Images and movies will be made available as soon as possible 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