Halo CME Mail

Date: Wed, 29 Oct 2003 18:47

From: Gareth Lawrence

Subject: Full Halo CME on 2003/10/29, frontsided

Status: O

UCMEO 93001 301029 2300/
31029 62054 82218 0001/ 360// 233// 41948
31029 62033 92136 30618 10486 1111/



LASCO and EIT observed a full halo CME on 2003/10/29.
The event was first observed in C2 at 20:54 UT as a bright
loop front over the S pole; by 21:08 UT the front had
developed into a full halo CME, very bright all around
the occulting disk. The front first appeared as a full 
halo CME in C3 images at 21:19 UT. The mean plane-of-sky 
speed for this event was 1948 km/s at PA 92, with evidence 
for strong deceleration. Please note that this measurement
only includes data out to 20 Rs and so speed and acceleration
estimates are likely to change as more data comes in.

The CME was probably associated with an X11 X-ray flare
observed by EIT between 20:33 - 21:36 UT, centered at
S18W06 with peak emission at 20:48 UT. GOES records this
flare from AR 0486 between 20:37 - 21:00 UT with peak
emission at 20:49 UT. A very 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 all images, particularly C3, are severely 
degraded due to the ongoing 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