Halo CME Mail

Date: Sat, 7 Sep 2002 12:38

From: Gareth Lawrence

Subject: Full Halo CME on 2002/09/05, frontsided

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

UCMEO 93001 20907 1830/
20905 61654 92042 0001/ 360// 123// 4642
20905 61624 91748 23008 10102 2122/
99999

PLAIN

BT

LASCO and EIT observed a full halo CME on 2002/09/05. The
event was first observed in C2 at 16:54 UT as a bright loop
front over the SE limb; by 17:30 UT the C2 occulting disk
was surrounded, though emission in the NW was fainter.
The front first appeared in C3 at 17:18 UT with full
coverage of the C3 occultor by 18:18. C3 data for this
event is poor since the LASCO/EIT LEB crashed during
commanding and data was lost between 18:42 - 19:58 UT.
The mean plane-of-sky speed for this event was 1642 km/s
at PA 112, with possible evidence for moderate acceleration
through the field of view.

The CME was most probably associated with a large eruptive
filament just E of AR0102, which EIT observed between
16:24 - 17:12 UT. The eruption was centred N08E30. GOES
records a C5.2 X-ray event between 16:18 - 17:35 UT with
peak emission at 17:06 UT. This event is recorded as a
flare but the EIT data suggest it could be due to the
bright post-CME loops that form. It is possible that a
very modest and limited EIT wave, but no dimming, were
observed in association with this event.

Movies and images of this event are available now at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20020905

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 001,                         +1-301-286-3447       |
| Greenbelt, MD 20771.                   Fax:    +1-301-286-0264       |
++