Halo CME Mail

Date: Mon, 12 Aug 2002 17:53

From: Gareth Lawrence

Subject: Partial Halo CME on 2002/08/09, frontsided

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UCMEO 93001 20812 2300/
20809 62330 91418 2451/ 045// 123// 40619
20809 62012 92336 40537 ///// 2222/
99999

PLAIN

BT

LASCO and EIT observed a partial halo CME on 2002/08/09. The
event was first observed in C2 at 23:30 UT as a bright loop
front over the N pole; by 00:06 UT faint extensions were
visible into the NE and down to the SW though the region
over the pole remained quite bright. The front extended from
PA 240 to PA 40 in total. The bright central front first
appeared in C3 at 00:18 UT with maximal coverage of the C3
occultor by 02:18, though the front is not as bright or
apparently wide in C3 as it was in C2. The plane of sky speed
of the front was measured as 619 km/s at PA 350 (NP), with
a moderate deceleration possible. Note that the leading edge
could only be measured out to 20 Rs .

The CME was most probably associated with an modest eruptive
prominence straddling central meridian, which EIT observed
between 20:12 - 23:36 UT. The prominence is most obvious at
22:00 UT spanning from N40E11 - N33W18. On-disk activity was
low during this time. Neither an EIT wave nor dimming were
observed in association with this event.

Movies and images of this event are available now at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20020809

and please note that the LASCO image processing software
does not render the EIT event very well.

Best wishes,
        Gareth Lawrence.

++
| 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 001,                         +1-301-286-3447       |
| Greenbelt, MD 20771.                   Fax:    +1-301-286-0264       |
++