Halo CME Mail

Date: Thu, 13 Nov 2003 14:51

From: Gareth Lawrence

Subject: Partial Halo CME on 2003/11/33, frontsided

Status: O

UCMEO 93001 31113 1900/
31113 60930 91518 3401/ 160// 233// 41085
31113 60900 90936 17505 10501 1111/

LASCO and EIT observed a partial halo CME on 2003/11/13. 
The event was first observed in C2 at 09:30 UT as a bright 
loop front over the E limb; by 10:30 UT the front spanned
~180 deg from PA 340 - 180. The front first appeared in 
C3 images at 10:20 UT with maximal coverage of the C3 
occultor by 11:18 UT. The mean plane-of-sky speed for 
this event was 1085 km/s at PA 85, with possible evidence
for modest acceleration. 

The CME was probably associated with an M1.4 X-ray flare
observed by EIT between 09:00 - 09:36 UT, centered at 
N05E75 with peak emission at 09:12 UT. GOES records this
flare from AR 0501 between 09:03 - 10:02 UT with peak 
emission at 09:29 UT. A very large EIT wave, and dimming,
were observed in association with this event and in fact
can be detected as far as W18 in the N. This event has 
therefore been determined frontsided. Note that AR 0501 
is probably the reappearance of old AR 0484.

Movies and images of this event will shortly be 
available 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