Halo CME Mail

Date: Fri, 28 Dec 2001 18:32

From: Gareth Lawrence

Subject: Partial Halo CME on 2001/12/28 - limb/backsided

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LASCO and EIT observed a very fast, bright partial CME on 2001/12/28.
The leading edge was first observed in the SW at 20:06 UT and spanned
~160 deg by 21:06 UT, though it appears somewhat wider since the
CME deflects and disrupts bright streamers to the N and S as it
propagates.

GOES reports an X3.4 X-ray flare between 20:02 and 21:32 UT peaking
at 2045 UT. EIT data clearly show this flare to be on or over the
SE limb, between 20:12 and 21:48 UT peaking at 20:48 UT. This event
has therefore been determined backsided. For reference, the mean
plane of sky speed between 2 and 30 Rs was 2170 km/s.

Best wishes,
        Gareth Lawrence.

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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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