Halo CME Mail

Date: Mon, 3 Nov 2003 19:06

From: Gareth Lawrence

Subject: Full Halo CME on 2003/11/02, frontsided

Status: O

UCMEO 93001 31103 2300/
31102 61730 82019 0001/ 360// 233// 41826
31102 61712 91800 35620 10486 1111/



LASCO and EIT observed a full halo CME on 2003/11/02.
The event was first observed in C2 at 17:30 UT as a bright
loop front in the SE; by 17:54 UT the front had developed 
into a full halo CME, though rather faint in the NE.
The front first appeared in C3 images at 17:42 UT with 
full coverage of the C3 occulting disk by 18:18 UT. The 
mean plane-of-sky speed for this event was 1826 km/s at 
PA 272, with evidence for strong deceleration. Please note 
that data beyond ~15 Rs for this event are poor due to the 
proton contamination.

The CME was probably associated with an X8.3 X-ray flare
observed by EIT between 17:12 - 18:00 UT, centered at
S20W56 with peak emission at 17:24 UT. GOES records this
flare from AR 0486 between 17:03 - 17:39 UT with peak
emission at 17:25 UT. A large EIT wave, and dimming,
were observed in association with this event. This 
event has therefore been determined frontsided. 

Movies and images of this event will shortly be
available at:


and note that many images, particularly C3, are severely 
degraded due to the proton storm.  

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