Halo CME Mail

Date: Thu, 25 Oct 2001 16:56

From: Gareth Lawrence

Subject: Full Halo CME on 2001/10/25

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UCMEO 93001 11025 1900/
11025 61526 81942 0001/ 360// 133// 40884
11025 61448 91536 32017 09672 1112/
99999

PLAIN

BT

LASCO and EIT observed a full halo CME on 2001/10/25. The
event was first observed in C2 at 15:26 UT as a fast, bright
loop front over the SW limb; by 15:50 UT the C2 occulting disk
was surrounded. The front first appeared in C3 at 16:18 UT
with full coverage of the C3 occultor by 17:18 UT. The plane
of sky speed of the front was measured as 884 km/s at PA 200
(SW) with slight deceleration through the coronagraphs'
fields of view.

The CME was most probably associated with an X1.3 X-ray flare in
AR9672 between 14:42 and 15:28 UT with peak emission at 15:02 UT.
EIT observed this flare between 14:48 and 15:36 UT, with peak
emission at 15:00. SEC places the flare at S17W20. Both an EIT
wave and dimming were observed in association with this event.

Images and movies of this event are available at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20011025

and note that the loops that can be seen over the N pole,
particularly in the C3 movie, are part of an earlier,
distinct eveny.

Best wishes,
        Gareth Lawrence.

++
| 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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