Halo CME Mail

Date: Tue, 11 Jul 2000 22:23:09 +0000 (GMT)

From: Simon Plunkett

Subject: Halo CME on 2000/07/11

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LASCO and EIT observed a full halo CME today, 2000/07/11. The event was
first visible in C2 at 13:27 UT, as a bright front extending all around
the occulting disk. The brightest part of the event was in the NE, and the
faintest was in the SW. The measured speed of the leading edge was 1040
km/s at PA 60 (NE limb).

EIT did not observe the onset of the CME, as it was not observing in
full-disk mode at the time. However, on resuming full-disk observations
in 195 A at 13:13 UT, EIT observed an X1 flare in AR 9077. The CME was
probably associated with this flare.

Images and movies of this event are available at the LASCO ftp server:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20000711.

Best wishes,

Simon Plunkett.

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| Simon Plunkett,              E-mail: plunkett@kreutz.nascom.nasa.gov |
| USRA, Mail Code 682.3,                                               |
| NASA Goddard Space Flight Center,      Phone:  +1-301-286-2941       |
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