Halo CME MailHalo CME Mail
Date: Mon, 27 Aug 2001 15:16
From: Gareth Lawrence 
Subject: Full Halo CME on 2001/08/25




UCMEO 93001 10827 2000/
10825 61650 82342 0001/ 360// 233// 31130
10825 61625 81748 23417 09591 1112/
99999
 
PLAIN
 
BT


LASCO and EIT observed a full halo CME on 2001/08/25. The event 
was first observed in C2 at 16:50 UT as a bright front filling
the SE quadrant, and was a full halo CME in C2 by 17:27. The 
front first appeared in C3 at 17:18 and was a full halo there by 
18:42 UT. The mean plane of sky speed of the front through both
instruments' fields of view was measured as 1130 km/s at PA 120 
(SE) with slight deceleration during the entire passage.

The CME was most probably associated with an X5.3 X-ray flare in
AR 9591, centred at S17E34. GOES detected this event between 
16:23 - 17:04 UT with peak emission at 16:45. The event appeared 
to commence in EIT at 16:25 UT with peak emission at 16:48.
Post-eruption loops are clearly visible by 17:48 UT. Both an 
EIT wave and dimming were observed in conjunction with the CME,
and both were largely directed/located to the S of the AR 

Images and movies of this event are available at: 
 
ftp://ares.nrl.navy.mil/pub/lasco/halo/20010825

Apologies for the belated notification of this CME.

Best wishes,
        Gareth Lawrence.

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| Gareth Lawrence,                   E-mail:grl@kreutz.nascom.nasa.gov |
| SOHO-LASCO Operations Scientist,				       |
| CUA, Mail Code 682.3,                                                |
| NASA Goddard Space Flight Center,      Phone:  +1-301-286-2941       |
| Building 26, Room G-1,                         +1-301-286-3447       |
| Greenbelt, MD 20771.                   Fax:    +1-301-286-0264       |
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