Halo CME Mail

Date: Mon, 22 Jan 2001 16:25:53 +0000 (GMT)

From: Simon Plunkett

Subject: Two full halo CMEs on 2001/01/20

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UCMEO 93001 10122 1630/
10120 61931 90218 0001/ 360// 733// 40673
10120 61848 82236 24007 09313 1112/
99999

PLAIN

BT

UCMEO 93001 10122 1630/
10120 62154 90218 0001/ 360// 733// 31576
10120 62112 82236 24007 09313 1112/
99999

PLAIN

BT

LASCO and EIT observed two full halo CMEs in close succession on
2001/01/20. The first event appeared as a bright front over the E limb in
C2 at 19:31 UT. This event became a full halo, but remained faint in the
W. The second event also appeared as a bright front over the E limb in C2
at 21:54 UT, and again became a full halo that was faint in the W. The two
events merged together in C3. The measured plane of the sky speeds were
673 km/s at PA 90 (E limb) for the first event, and 1576 km/s at PA 80 (E
limb) for the second event. Only three measurement points could be
obtained for the second event, before the two events merged together.

EIT observed two M class flares from AR 9313, located at S07 E40. The
first was an M1.2 flare beginning at 18:48 UT, and the second was an M7.7
flare beginning at 21:12 UT. Both events were accompanied by significant
coronal dimming and probable wave events.

Images and movies of these events are available at the LASCO ftp server:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20010120.

Best wishes,

Simon Plunkett.

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