Halo CME Mail

Date: Mon, 27 Oct 2003 19:50

From: Gareth Lawrence

Subject: Full Halo CME on 2003/10/26, frontsided

Status: O

UCMEO 93001 301027 2330/
31026 61754 92218 0001/ 360// 233// 41432
31026 61736 92000 44202 10484 1111/



LASCO and EIT observed a full halo CME on 2003/10/26.
The event was first observed in C2 at 17:54 UT as a bright
loop front over the W limb; by 18:30 UT the front had
developed into a full halo CME, though faint in the E. 
The front first appeared in C3 images at 18:18 UT with 
full coverage of the C3 occultor by 20:18 UT. The mean 
plane-of-sky speed for this event was 1432 km/s at PA 265, 
with possible evidence for modest deceleration.

The CME was probably associated with an X1.2 X-ray flare
observed by EIT between 17:36 - 20:00 UT, centered at
N02W42 with peak emission at 18:36 UT. GOES records this
flare from AR 0484 between 17:21 - 19:21 UT with peak
emission at 18:19 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:


Please note a minor typo in the report on an earlier event
from the same day. In the first paragraph, the penultimate
sentence should read, "... the partial halo CME to the E
E could have a faint component in the W."

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