Date: Tue, 7 Nov 2006 13:50
From: Guillermo Stenborg
Subject: Very asymmetric Full Halo event on 2006/11/06, barely backsided
Status: O
UCMEO 93001 61107 1750/
61106 61754 80042 0002/ 360// 123// 31995
61106 61743 81806 18900 ///// 1122/
99999
PLAIN
LASCO/EIT observed a very asymmetric Full Halo Event on 2006/11/06. The
event was first seen in the LASCO C2 FOV as a very bright front
all above the NE Limb at 17:54 UT. Diffuse loop-like extensions develop
to N, spanning across the N Pole by 18:06 UT. These diffuse extensions
surround the C2 occulting disk by 18:54 UT (bulk of the CME already well
past the outer edge of the C2 FOV on E, signal on SW barely above the
occulting disk). The event is first seen in C3 at 18:42 UT, the bulk of
the CME heading toward NE and very bright, the loop-like extensions
already covering all above the N Pole. The C3 occulting disk is fully
surrounded by the loop-like extension by 21:42 UT. By that time, the
LE of the bulk of the event on NE already reached the end of the
C3 FOV. The mean plane-of-sky speed of the LE at PA ~ 72 deg was ~
1995 km/sec (based on C2 and C3 data).
GOES recorded a C8.8 X-ray flare on N00E89 between 17:43 - 18:06 UT with
peak emission at 17:46 UT. EIT 195 images show signatures of a big CME all
above the E and NE limb starting at 17:36 - 17:48 UT. The source of the
CME is in the backside, apparently barely behind the E Limb. A wave
follows, covering as it develops most of the E part of the disk.
In summary, the event has therefore been determined as a very asymmetric
full halo, associated to a close-to-limb backsided event. Important
wave signatures associated to the event could be seen all across the
eastern part of the disk (in other words, be aware of the flank of the
event).
Movies and images of the event will shortly be made available at:
ftp://ares.nrl.navy.mil/pub/lasco/halo/20061106
Best wishes,
Guillermo Stenborg
++
Dr. Guillermo A. Stenborg
SOHO-LASCO Operations Scientist,
CUA, MC 612.5, Bldg 26, Rm 001, F: +1-301-286-0264
NASA Goddard Space Flight Center,
Greenbelt, MD 20771. P: +1-301-286-2941
e-mail: stenborg@kreutz.nascom.nasa.gov
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