Date: Mon, 19 Nov 2001 14:03
From: Gareth Lawrence
Subject: Full Halo CME on 2001/11/17
Status: O
UCMEO 93001 11119 1900/
11117 70530 91023 0001/ 360// 233// 41173
11117 60324 90624 24213 09704 1222/
99999
PLAIN
BT
LASCO and EIT observed a full halo CME on 2001/11/17. The
event was first observed in C2 at 05:30 UT as a fast, bright
loop front over the E limb; by 05:54 UT the C2 occulting disk
was surrounded, though emission in the W was faint. The
front first appeared in C3 at 05:42 UT with full coverage
of the C3 occultor by 06:42 UT. The plane of sky speed of
the front was measured as 1173 km/s at PA 59 (NE) with some
deceleration through the coronagraphs' fields of view.
The CME was most probably associated with an eruptive filament
that was soon followed by an M2.8 X-ray flare. The filament
was observed lifting off by EIT between 03:24 - 05:36 UT, and
the flare was observed between 05:24 - 06:24 UT with peak emission
at 05:35. Note that EIT's cadence was rather uneven during this
period, and in particular the start time for the flare may not
be reliable. GOES observed the flare between 04:49 - 06:11 UT
with peak emission at 05:25. SEC records the flare from AR9704,
centered on S13E42. Note also that the region from which the
filament appeared to originate is somewhat to the N and E of
this, centered around S04E47. Neither an EIT wave nor a dimming
were observed in association with this event.
Images and movies of this event are available at:
ftp://ares.nrl.navy.mil/pub/lasco/halo/20011117
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 |
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