Halo CME Mail

Date: Tue, 8 Jan 2002 19:38

From: Gareth Lawrence

Subject: 'Partial Halo' CME on 2002/01/08, limb/backsided event

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LASCO and EIT observed a wide, bright 'partial halo' CME on
2002/01/08. A bright loop front was observed over the E limb
in C2 at 17:54 UT, which spanned 180 deg from the N to S poles
by 18:54 UT. The front first appeared in C3 at 18:18 UT
spanning ~180 deg by 19:42 UT.

EIT data clearly show a large, fast CME slightly over the E
limb, straddling the solar equator. This CME has therefore been
determined a limb/backsided event. Please note that the bright
front and core in the N and NW are visible in EIT as a narrow
eruptive prominence centered around N55W35. Given its size and
apparent source location and direction of propagation we
consider the geoeffective potential of this CME to be minimal.
For reference, neither CME appeared to propagating in a
direction that might possibly lead to an interaction with
comet 96P/Machholz.

Ratio and running difference movies may be found at

        http://lasco-www.nrl.navy.mil/rtmovies.html

but note that the movies presently suffer from a high degree of
'flicker' due to some images being taken at reduced exposure times.

Also please note that I will be away on work-related travel for the
next two weeks. All halo CME reports will be handled by Kevin Schenk.

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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