Halo CME Mail

Date: Mon, 16 Jun 2003 19:34

From: Gareth Lawrence

Subject: 'Full Halo CME' on 2003/06/15, probably frontsided

Status: O

UCMEO 93001 30616 2315/
30615 62354 90342 0001/ 360// 233// 42002
30615 62348 90024 27805 10386 1222/

LASCO and EIT observed a 'full halo CME' on 2003/06/15. The 
event was first observed in C2 at 23:54 UT as a bright loop 
front over the E limb; this had developed to a full halo
CME by 00:30 UT, albeit faint in the E. The front first 
appeared in C3 at 00:18 UT with full coverage of the C3 
occultor by 01:42 UT. The mean plane-of-sky speed for this 
event was 2002 km/s at PA87 , with possible evidence for 
moderate deceleration, though this could easily be due to
significant measurement errors of the faint front far into 
the C3 field of view. 

The CME was probably most associated with an X1.3 X-ray flare
observed by EIT between 23:48 - 00:24 UT, centered at S05E78
with peak emission at 00:00. GOES records this flare from
AR 0386 (probably old AR 0365) at S07E80 between 23:25 - 00:25 UT
with peak emission at 23:56 UT. No obvious EIT wave nor dimming 
were observed in association with this event. Considering the 
location of the flare and the faint emission in the W hemisphere
this event has been determined probably frontsided.

Movies and images of this event are available at: 

Apologies for the rather late sending of this report. I am 
attending the AAS-SPD meeting in Laurel, MD all week. If
similar activity continues from AR 0386, please bear in
mind that these reports will not appear until late in
the day.

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