Halo CME Mail

Date: Fri, 2 Nov 2001 16:46

From: Gareth Lawrence

Subject: Partial Halo CME on 2001/11/01

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UCMEO 93001 11102 1930/
11101 62230 90942 1771/ 033// 223// 40337
11101 62148 92348 42312 09672 1222/
99999

PLAIN

BT

LASCO and EIT observed a partial halo CME on 2001/11/01. The
event was first observed in C2 at 22:30 UT as a very narrow
loop front over the SE limb; by 23:30 UT this front spanned
about 213 deg around the C2 occulting disk from PA 177 to PA 33.
The front first appeared unambiguously in C3 at 23:42 UT with
maximal coverage of the C3 occultor by 00:18 UT. The plane
of sky speed of the front was measured as 338 km/s at PA 268
(W) with very small acceleration through the coronagraphs'
fields of view.

The CME was most probably associated with an M1.1 X-ray flare in
AR9672 between 21:38 and 23:59 UT with peak emission at 23:52 UT.
EIT observed this flare between 21:48 and 23:48 UT, with peak
emission at 23:12 UT. SEC places the flare at N12W23. Neither an
EIT wave nor a dimming was observed in association with this event.

Images and movies of this event are available at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/2001101

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| Gareth Lawrence,                   E-mail:grl@kreutz.nascom.nasa.gov |
| SOHO-LASCO Operations Scientist,                                     |
| CUA, Mail Code 682.3,                                                |
| NASA Goddard Space Flight Center,      Phone:  +1-301-286-2941       |
| Building 26, Room G-1,                         +1-301-286-3447       |
| Greenbelt, MD 20771.                   Fax:    +1-301-286-0264       |
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