Halo CME Mail

Date: Fri, 7 Jul 2000 18:21:13 +0000 (GMT)

From: Simon Plunkett

Subject: Halo CME on 2000/07/07

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LASCO observed a full halo CME today, 2000/07/07. The event was first
visible as a diffuse front above the SW limb in C2 at 10:26 UT. It was
later seen all around the occulting disks in both C2 and C3. The measured
speed in the plane of the sky at PA 195 (SW) was 455 km/s, averaged
through the C2 and C3 fields of view. There may be some acceleration in
this region, up to about 10 m/s^2.

EIT was not observing in its usual mode at the time of the CME, and no
full-disk 195 A images are available between 07:13 UT and 13:13 UT. The
image at 13:13 UT shows a bright arcade of loops near central meridian,
just to the west of AR 9070, that was not present in the image at 07:13
UT. This may be the source of the CME, but the association is uncertain.

Images and movies of this event can be found at the LASCO ftp server:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20000707.

Best wishes,

Simon Plunkett.

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| Simon Plunkett,              E-mail: plunkett@kreutz.nascom.nasa.gov |
| USRA, Mail Code 682.3,                                               |
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