Subject: SOHO/LASCO HALO CME 100408

UCMEO 93001 00408 2040/
00408 60430 81418 2461/ 245// 113// 20286
00408 60236 80324 11625 11060 1122/
99999

PLAIN

SOHO/LASCO observed a full HALO CME (type F) on April 08, 2010.  Event began in C2 at 04:30 UT
as a very faint ragged loop front centered at PA 246 degrees. The event quickly developed to material
at all positions for a total coverage of 360 degrees.  The event continues into the C3 field
beginning at 06:18 UT.   As the event quickly dissipated we tracked through the field as the event
ends at approximately 14:18 UT to 15.8 Rsun.

Time/height measurements were marked to 17 points and calculated to velocities of this
event averaging 286. Km/sec at position angle 240 degrees.

The event was first seen in EIT  at 02:36-03:24 UT with a flare of AR 11060 then located at [N25E16].
The flare produces a faint EIT wave expanding predominately with southern direction and a post arcade.

GOES reports a long duration class B3.7 xray flare of AR 11060 on April 8, 2010 02:30-03:25 UT.
The events in EIT and Lasco are most probably related to this flare and confirming a FRONTSIDED
HALO event.

EIT and LASCO images, movies and time/height information for this event is available on the web at:

http://umbra.nascom.nasa.gov/lasco/observations/halo/2010/100408/

Best regards,

Kevin Schenk
SOHO Mission
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA

BT