Halo CME Mail

Date: Tue, 23 Oct 2001 11:55

From: Gareth Lawrence

Subject: Full Halo CME on 2001/10/22

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UCMEO 93001 11022 1600/
11022 61506 92042 0001/ 360// 233// 41304
11022 61436 91612 21816 09672 1212/
99999

PLAIN

BT

LASCO and EIT observed a full halo CME on 2001/10/22. The
event was first observed in C2 at 15:06 UT as a fast, bright
loop front over the SE limb; by 15:50 UT the C2 occulting disk
was surrounded. The front first appeared in C3 at 15:42 UT
with full coverage of the C3 occultor by 16:18 UT. The plane
of sky speed of the front was measured as 1304 km/s at PA 123
(SE) with very slight deceleration through the coronagraphs'
fields of view.

The CME was most probably associated with an M6.7 X-ray flare in
AR9672 between 14:25 and 16:02 UT with peak emission at 15:12 UT.
EIT observed this flare between 14:36 and 16:12 UT, with peak
emission at 15:12. SEC places the flare at S16E18. An EIT
wave dimming was observed in association with this event, but
no dimming.

Images and movies of this event are available at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20011022a

Please note that a second halo CME was observed in probably
association with the X1.2 X-ray flare from the same active
region some hours later. A report on this event is in
preparation and will appear shortly.

Best wishes,
        Gareth Lawrence.

++
| Gareth Lawrence,                   E-mail:grl@kreutz.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       |
++