Halo CME Mail

Date: Thu, 16 May 2002 11:39

From: Gareth Lawrence

Subject: Full Halo CME on 2002/05/16, frontsided

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

UCMEO 93001 20516 1630/
20516 60050 90942 0001/ 360// 223// 40548
20515 62348 90212 21420 09948 1212/
99999

PLAIN

BT

LASCO and EIT observed a full halo CME on 2002/05/16. The
event was first observed in C2 at 00:50 UT as a faint loop
front over the SE limb; by 02:06 UT the C2 occulting disk
was surrounded by significantly brighter fronts. The front
first appeared in C3 at 01:42 UT with full coverage of the
C3 occultor by 03:42 UT. The plane of sky speed of the front
was measured as 548 km/s at PA 156 (SE) with slight
deceleration through the coronagraphs' fields of view.

The CME was most probably associated with an C3.5 X-ray flare
in AR9948, which EIT observed between 23:48 - 02:24 UT with
peak emission at 00:24 centered on S20E14. GOES observed the
flare between 23:44 - 00:06 UT with peak emission at 23:59.
Note that the EIT activity described includes the X-ray flare
and a significant amount of related dynamical processes in the
active region and its immediate vicinity. An EIT wave but no
dimming were observed in association with this event, the wave
primarily directed towards the E.

Images and movies of this event are available at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20020516

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       |
++