
LASCO Activity Report for
November 16, 2007 SOHO Science Daily Meeting
Planner: K. Schenk, G. Stenborg
Event times are first frame seen in C2 camera unless otherwise noted.
These are preliminary observations for the daily SOHO science discussions.
Final analysis is reported on the Lasco CME list.
An archive of these reports is available.
Points Of Interest
2007/11/15 (Thursday)
09:26 UT WS West Small front in the trail of the event that was
reported to start early in the afternoon on previous
day.
18:06 UT N West Very faint Halo Event in C2: The event started to be
discernible (in fact, barely discernible) in C2 on
11/15 at around 18:06 UT above the NW Limb. Due to
its extreme faintness, it is difficult to be accurate
with the time of first appearance. Diffuse extensions
start to be seen on E by 20:50 UT. By 23:26 UT, the
event looks in C2 like a butterfly (signal above the
S Pole extremely faint). Only the part of the event
developing toward NW is well discernible in C3 (first
seen on 11/16 00:18 UT, vanished by 08:18 UT, leading
edge at ~ 11 solar radii, angular width < 75 deg).
Something can be guessed on NE, but only close to the
inner edge of C3. The mean plane-of-sky speed of the
LE at PA 320 was ~ 155 km/sec (based on C3 data).
GOES recorded no significant X-ray activity (below
A-level) during 11/15. Likewise, no frontside activity
can be seen in EIT 195 images. In summary, the event
has been determined as a very faint Halo Event only
discernible in C2 as a halo, most probably backsided.
2007/11/16 (Friday)
09:26 UT WS West Bright loop front followed by core material.
Last C2 image available by the time of writing: 11:06 UT
Web curator:
K.M.Schenk
NASA Goddard Space Flight Center
Solar Physics Branch / Code 682
Greenbelt, MD 20771