Halo CME Mail

Date: Mon, 1 Oct 2001 15:34:37 -0400 (EDT)

From: Gareth Lawrence

Subject: Partial Halo CME on 2001/09/29

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UCMEO 93001 11001 1930/
10929 61154 92142 3551/ 210// 113// 30521
10929 61028 81148 10313 09636 1222/
99999

PLAIN

BT

LASCO and EIT observed a partial halo CME on 2001/09/29.
The event was first observed in C2 at 11:54 UT as a faint
loop front in the NE. By 12:30 UT this front spanned some
210 deg over both poles from PA 355 to PA 210. The front
first appeared in C3 at 12:42 UT with maximal coverage of
the C3 occultor by 14:42 UT. The plane of sky speed of
the front was measured as 521 km/s at PA 82 (E) with a
slight deceleration through the coronagraphs' fields of
view.

The CME was most probably associated with an M1.8 X-ray flare
in AR9636 between 10:19 and 11:48 UT with peak emission at 11:06.
EIT also observed this flare between 10:28 and 11:48, peaking at
10:50. SEC places the flare at N13E03. Neither a dimming nor an
EIT wave were observed in association with this event. Bright
post-eruption loops are clearly visible from about 12:00 UT.

Images and movies of this event are available at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20010929

As a footnote I would like to note that the large fast bright
CME seen in LASCO data from 05:30 UT on 2001/10/01 has been
determined a limb/backsided event, probably associated with
an M9 X-ray flare and eruptive prominence visible in EIT and
probably originating from or near AR9632 which has just
recently rotated over the W limb. Images and movies of this
event are available at

ftp://ares.nrl.navy.mil/pub/lasco/halo/20011001

Finally, due to hardware problems at GSFC the images and movies
of the partial halo CME reported on 2001/09/28 were not available
over the weekend. This has now been rectified and the files can
be obtained from

ftp://ares.nrl.navy.mil/pub/lasco/halo/20010928

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