Halo CME Mail

Date: Tue, 26 Jun 2001 16:36:17 -0400 (EDT)

From: Gareth Lawrence

Subject: Full halo CME on 2001/06/24 - probably backsided

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LASCO observed a full halo CME on 2001/06/24. A bright front first
appeared in the NE quadrant of C2's field of view at 07:31 UT, and
the C2 occultor was surrounded by 07:54. The bright front first
appeared in the NE of C3's field of view at 08:18 UT and surrounded
the occulting disk at 09:18. The front was still discernible,
mainly in the SW, until 17:42. The mean plane-of-sky speed,
measured at PA 9, was 658 km/s, with a small deceleration through
both fields of view.

In the opinion of the LASCO and EIT operations and science teams
at GSFC the CME was probably backsided. However, there is a chance
it was associated with a short duration flare observed near disk
center. GOES recorded a C3.9 flare in AR 9511, N10E11, from 06:32
to 06:37, peaking at 06:35. EIT observed a flare in this region
peaking at 06:36. There was no wave or dimming associated with
the event, and no other significant activity or disruption on the
disk. Hence this event has been determined most probably backsided,
with a very small chance of a frontsided origin near disk-center.

Movies of this event can be found at

http://lasco-www.nrl.navy.mil/daily_mpg/

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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