Halo CME Mail

Date: Sat, 20 Oct 2001 16:57

From: Gareth Lawrence

Subject: Full Halo CME on 2001/10/19, second event

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UCMEO 93001 11020 2200/
11019 61650 92348 0001/ 360// 233// 30705
11019 61612 91724 42915 09661 1112/
99999

PLAIN

BT

LASCO and EIT observed another full halo CME on 2001/10/19.
The event was first observed in C2 at 16:50 UT as a bright
loop front over the W limb; by 17:26 UT the C2 occulting disk
was surrounded. The front first appeared in C3 at 17:18 UT
with full coverage of the C3 occultor by 18:18 UT. The plane
of sky speed of the front was measured as 704 km/s at PA 279
(W) with slight deceleration through both coronagraphs'
fields of view.

The CME was most probably associated with an X1.6 X-ray flare
in AR9661 between 16:13 and 16:43 UT with peak emission at
16:30 UT. EIT observed the flare between 16:12 and 17:24 UT
with peak emission at 16:24 UT, and bright post-CME loops are
visible after 17:24 UT. SEC places the flare at N15W29. An EIT
wave and dimming were observed in association with this event.

Images and movies of this event are available at:

ftp://ares.nrl.navy.mil/pub/lasco/halo/20011019b

and please note that the images and movies from the earlier event
on this day have been successfully restored to the URL noted in
the earlier alert.

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       |
++