Halo CME Mail

Date: Wed, 28 Feb 2001 17:08

From: Gareth Lawrence

Subject: Full Halo CME, 2001/02/28

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UCMEO 93001 10228 2200/
10228 61450 92118 0001/ 360// 113// 40296
10228 61325 91424 31207 0//// 3212/
99999

PLAIN

BT

LASCO and EIT observed a full halo CME on 2001/02/28. The event was
first observed in C2 at 14:50 UT, as a bright loop front over the W limb.
At 16:50 this bright front extended from about PA 142 to PA 350, while
fainter extensions could be seen around the remainder of the C2 occulting
disk. The westerly front first appeared in C3 at 16:42 and the
C3 occulting disk was surrounded by 20:18. The plane-of-sky speed of
the leading edge through to the edge of the C2 field of view was about
296 km/s at PA 263 (W limb). Please note that at the time of reporting
the front was at roughly 13 solar radii, less than halfway through the
C3 field of view.

The CME was probably associated with an eruptive filament observed near
disk center by EIT between 13:25 and 14:24 UT. The center of the region
first visibly affected was S07W12 and the greater part of EIT activity
appeared somewhat to the W of this, consistent with the first
appearance of the CME over the W limb. This site of origin was somewhat
to the E of AR 9360 but unconnected to it.

Images and movies of this event are available at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20010228.

Best wishes,

        Gareth Lawrence.

++
| Gareth Lawrence,                 E-mail:grl@ajcannon.nascom.nasa.gov |
| SOHO-LASCO Operations Scientist,                                     |
| CUA, Mail Code 682.3,                                                |
| NASA Goddard Space Flight Center,      Phone:  +1-301-286-2941       |
| Building 26, Room G-1,                         +1-301-286-3447       |
| Greenbelt, MD 20771.                   Fax:    +1-301-286-0264       |
++