Halo CME Mail

Date: Mon, 17 Nov 2003 13:14

From: Gareth Lawrence

Subject: Partial Halo CME on 2003/11/17, frontsided

Status: O

UCMEO 93001 31117 1700/
31117 60926 91442 3301/ 200// 223// 41018
31117 60900 90936 13101 10501 1111/

LASCO and EIT observed a partial halo CME on 2003/11/17. 
The event was first observed in C2 at 09:26 UT as a faint 
loop front in the SE limb; by 09:50 UT a bright loop front 
filled the SE quadrant and by 10:50 UT the front spanned
~230 deg from PA 330 - 200, albeit faint in the N. The 
front first appeared in C3 images at 10:42 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 155, with possible 
evidence for modest deceleration. 

The CME was probably associated with an M4.2 X-ray flare
observed by EIT between 09:00 - 09:36 UT, centered at 
N01E31 with peak emission at 09:12 UT. GOES records this
flare from AR 0501 between 08:55 - 09:19 UT with peak 
emission at 09:05 UT. A modest EIT wave and possible 
slight dimming were observed in association with this 
event. This event has therefore been determined frontsided. 
Note that filament channels to the S and W of the active
region were activated during this event.

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