Halo CME Mail

Date: Thu, 29 Mar 2001 13:13

From: Gareth Lawrence

Subject: Full halo CME on 2001/03/29

  ------------------------------------------------------------------------

UCMEO 93001 10329 1900/
10329 61026 91718 0001/ 360// 223// 4991
10329 61000 91048 41920 09393 1112/
99999

PLAIN

BT

LASCO and EIT observed a full halo CME on 2001/03/29. The event
was first observed in C2 at 10:26 UT as a bright narrow front over
the NW limb. The C2 occulting disk was surrounded by 10:50 although
emission over the N pole was faint. The bright front first appeared
in C3 at 11:18 with the C3 occultor surrounded by 11:42. The plane
of sky speed of the fastest region of the front was measured as
991 km/s at PA 78 (NW) with significant deceleration through both
coronagraphs.

The most probable source of the CME was an X1.7 X-ray flare in
AR 9393. GOES records the flare between 09:57 and 10:32 UT with
peak emission at 10:15. The flare was observed in EIT from 10:00
to 10:48 with peak emission apparently at 10:14. Some dimming
and wave motion were observed but these were constrained somewhat
by nearby active regions.

Images and movies of this event are available at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20010329

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       |
++