Halo CME Mail

Date: Tue, 28 Oct 2003 11:16

From: Gareth Lawrence

Subject: Full halo CME on 2003/10/28, frontsided

Status: O

UCMEO 93001 301028 1500/
31028 61054 91420 0001/ 360// 233// 42125
31028 61036 91212 20916 10486 1111/



LASCO and EIT observed a full halo CME on 2003/10/28.
The event was first observed in C2 at 10:54 UT as a bright
loop front over the W limb; by 11:30 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 11:42 UT. The mean plane-of-sky 
speed for this event was 1785 km/s at PA 92, with evidence 
for strong acceleration below 5Rs. The height-time profile
above 5Rs is moderately linear and has a mean plane-of-sky
speed of 2125 km/s

The CME was probably associated with an X17.2 X-ray flare
observed by EIT between 10:36 - 12:012 UT, centered at
S16E09 with peak emission at 11:12 UT. GOES records this
flare from AR 0486 between 09:51 - 11:24 UT with peak
emission at 1110 UT. A very large EIT wave, and dimming,
were observed in association with this event. This event
has therefore been determined frontsided. Please note that
a large prominence can be seen erupting slightly below the
active region prior to the flare, and this prominence material
can clearly be seen in LASCO images, to the S. 

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


and note that all images after 13:00 UT, 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