Date: Fri, 3 Dec 2004 11:07
From: Guillermo Stenborg
Subject: 'Full' Halo CME on 2004/12/03, frontsided
UCMEO 93001 41203 1600/
41203 60026 81042 0001/ 360// 123// 21150
41202 62344 80035 40208 10708 1112/
99999
PLAIN
BT
LASCO/EIT observed a 'full' halo event on 2004/12/03. The event
was first seen in C2 at 00:26 UT already surrounding the occulting
disk. In particular, a brighter feature can be discerned developing
above the North Pole - NE with faint extensions extending a little
further out, and all the way through the western hemisphere, S Pole
(most faint), and eastern hemisphere. The event is first seen in C3,
all above the N Pole by 00:42 UT. The event looks extremely faint
in the S - SE region of the C3 FOV during its whole development.
The mean plane-of-sky speed of the LE of the outermost layers of
the event at several PA is given below (based on C3 data, all cases
showing practically no acceleration):
PA 002 --> 937 km/sec
PA 076 --> 1074 km/sec
PA 267 --> 773 km/sec
PA 326 --> 1150 km/sec
GOES reported an M1.5 X-ray flare on NOAA AR 10708 (N08W02) between
23:44 (on Dec.02) - 00:35 UT with peak emission at 00:06 UT, which was
clearly associated with the event. EIT 195 images show a strong
brightening on NOAA AR 10708 just starting at 23:48 UT (on Dec.02),
followed by a rather circular intensity disturbance traveling away
from the AR, and a relative large dimming region on NW of the AR (and
also to E). Nice post-flare loops. A filament previously 'winding'
through the region cannot be seen any longer.
In summary, the event has therefore been determined as a 'full' halo
CME event, frontsided.
Movies and images of the complex event will shortly be made available
at:
ftp://ares.nrl.navy.mil/pub/lasco/halo/20041203
Best wishes,
Guillermo Stenborg
++
Dr. Guillermo A. Stenborg
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
e-mail: stenborg@kreutz.nascom.nasa.gov
++