Date: Wed, 3 Nov 2004 19:05
From: Guillermo Stenborg
Subject: Asymmetric 'full' halo CME on 2004/11/03, frontsided
UCMEO 93001 41104 0005/
41103 61606 92218 0001/ 360// 123// 31016
41103 61535 81555 13809 10696 1122/
99999
PLAIN
BT
This is the report corresponding to the second frontsided event
observed by LASCO/EIT on 2004/11/03.
This 'second' event was first observed in C2 at 16:06 UT above
the E Limb (afterward developing mainly toward NE), as a bright
loop front with a faint and diffuse extension all above the SE
Limb and S Pole. It morphology is pretty similar in appearance
to that of the event at 03:54 UT. The difference is that i) it
moves apparently faster, ii) the faint extensions on SE and S look
a little bit brighter, and iii) the C3 occultor seems to be
completely covered (by 18:42 UT). The event is first seen in C3
at 16:42 UT. The mean plane-of-sky speed of the LE of the front
at PA 43 was ~ 1016 km/sec (based on C3 data) showing practically
no acceleration.
GOES reported an M5.0 X-ray flare on NOAA AR 10696 (N09E38) between
15:35 - 15:55 with peak emission at 15:47 UT, most likely associated
to the event described above. On the other hand, EIT 195 images
show a strong brightening on the aforementioned AR at 15:48 UT,
followed as in the previous reported event by an intensity
disturbance travelling mainly toward NE, jointly with a wave-like
disturbance travelling partially across the disk with apparent
epicenter on AR 10696.
In summary, the event has therefore been determined as an asymmetric
'full' halo CME, frontsided.
Movies and images of the event will shortly be made available
at:
ftp://ares.nrl.navy.mil/pub/lasco/halo/20041103b
Please also note that GOES reported an M1.0 X-ray flare again from
NOAA AR 10696 between 18:03 - 18:35 UT with peak emission at 18:26 UT.
C2 images show a ragged expanding from above the ENE Limb starting at
18:54 UT. EIT 195 images show a brightening on the aforementioned
AR starting at ~ 18:00 - 18:12 UT and an intensity disturbance shortly
afterward travelling mainly toward W. By 22:08 UT, the event spans only
about 70 deg in C3, from PA 20 - 90.
Best wishes,
Guillermo Stenborg
++
Dr. Guillermo A. Stenborg
SOHO-LASCO Operations Scientist,
CUA, MC 682.3, 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
++