Halo CME Mail

Date: Mon, 12 Feb 2001 13:59

From: Gareth Lawrence

Subject: BACKSIDED halo CME 2001/02/10

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LASCO observed a very faint full halo CME on 2001/02/10. A front
was first visible in C2 at 05:54 UT, over the N Pole. By 07:31 a
faint extension was visible around the entire C2 occulting disk,
with that in the N hemisphere significantly brighter than in the S.
The northerly front first appeared in C3 at 06:42, with full
coverage by 09:42.

EIT observed a small, bright CME on the N West of the disk at 05:24
and this CME is visible in C2 by 06:30 as a small bright feature
trailing the main front. However, a great deal of backsided activity
was determinable in EIT difference movies between 02:24 - 02:28,
04:30 - 05:24 and 06:12 - 06:36.

Additionally the only GOES X-ray events around this time have not
been attributed to any active regions, suggesting they may have
been backsided events. They were also small events (C2 and 1.4).
As a result this event has been determined backsided.

Best wishes,
        Gareth Lawrence.

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| Gareth Lawrence,                 E-mail:grl@ajcannon.nascom.nasa.gov |
| SOHO-LASCO Operations Scientist,                                     |
| CUA, Mail Code 682.3,                                                |
| NASA Goddard Space Flight Center,      Phone:  +1-301-286-3412       |
| Building 26, Room G-1,                         +1-301-286-3447       |
| Greenbelt, MD 20771.                   Fax:    +1-301-286-0264       |
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