Halo CME MailHalo CME Mail
Date: Fri, 9 Jan 2004 16:08
From: Guillermo Stenborg 
Subject: Partial Halo CME on 2004/01/08, frontsided




UCMEO 93001 40109 2015/
40108 60506 80942 0151/ 150// 313// 31556
40108 60424 80636 16401 10537 1122/
99999
 
PLAIN
 
BT
 

LASCO/EIT observed a faint 'partial' halo CME on 2004/01/08.
The event was first discerned in C2 at 05:06 UT over the SE
limb as a strong loop front with cavity and twisted 
trailing material brightest to S. By the time the event reaches
the C3 fov the event appears as a diffuse transequatorial 
loop front brightest to S spanning ~135 deg from PA 15 - 150 
at 07:42 UT (farthest point of leading edge at ~26 solar radii). 
The mean plane-of-sky speed for this event 
averaged 1556 km/s measured at PA ~114 based on C3 data with
practically no acceleration.

The CME was probably associated with an M1.3 X-ray flare from
the NOAA AR 10537 located N01E64, which GOES records between 
04:53 - 05:21 UT with peak emission at 05:07 UT. EIT/FeXII 
images show a brightening on AR 10537 starting at 04:24 UT.
The quite sun region to the SW of the AR appears to dim over
the course of the next hour, what could be associated to a 
modest EIT wave. No dimming is observed.

This event has therefore been determined frontsided.

Movies and images of this event will shortly be
available at:
 
ftp://ares.nrl.navy.mil/pub/lasco/halo/20040108

Best regards,
	Guillermo Stenborg

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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
++