Halo CME MailHalo CME Mail
Date: Mon, 12 Jan 2004 15:13
From: Guillermo Stenborg 
Subject: Partial Halo CME on 2004/01/11




UCMEO 93001 40112 1915/
40111 62030 81020 0802/ 220// 323// 30400
///// ///// ///// ///// ///// 5//2/
99999
 
PLAIN
 
BT


LASCO/EIT observed a 'partial' halo CME on 2004/01/11. 
The event was first observed in C2 at 20:30 UT 
as a bright loop front emerging from the SE limb. 
Following frames show a well defined loop with 
strong cavity and twisted inner structure spanning 
~140 deg from PA 80 - 220 as measure in C3 at 06:18 UT
on 2004/01/12. Loop-shaped outflow follows at S Pole.
The mean plane-of-sky speed for this event averaged 
400 km/s measured at PA ~125 based on C3 data. 
Worth mentioning is that on 2004/01/12 at 06:30 UT a 
ragged fan-like front appears on the E limb (at roughly 
the position of the northern leg of the event). Moreover, 
at PA ~165 another narrow ragged front appears in C2 at 
10:06 UT. 

At around the time of the starting of the event no related 
activity is seen on EIT/FeXII images. However, i) on 2004/01/12
between 06:48 and 07:13 UT a prominence is seen to erupt 
towards N on the East limb most likely related to the fan 
observed in C2. Likewise, at around 07:00 UT a very faint part of 
a filament in the SE quadrant seems to lift off very slowly, 
most likely being the material responsible for the feature 
seen at PA ~165 mentioned above.

This event has therefore been determined most probably
backsided, though at the end some prominence material seem
to be ejected earthwards.

Movies and images of this event will shortly be 
available at: 
 
ftp://ares.nrl.navy.mil/pub/lasco/halo/20040111

Best regards

        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
++