Subject: SOHO/LASCO HALO CME 100224 - Backsided

UCMEO 93001 00224 2220/
00224 60354 81018 3432/ 190// 113// 30350
///// ///// ///// ///// ///// 6//// 
99999

PLAIN

SOHO/LASCO observed a partial HALO CME (type P) on February 24, 2010.  Event began in C2 at 03:54 UT 
as a faint asymmetric leading edge loop front over the East, centered approximately at PA 58 degrees,
with material eventually seen from PA 343 - 190 for a total coverage of 207 degrees. 
The event continues into the C3 field beginning at 05:18 UT and measured through the field
as the event ends and dissipates at approximately 10:18 UT to 9.5 Rsun.

Time/height measurements were marked and calculated to velocities of this
event averaging 350.4 Km/sec at position angle 69 degrees through C2 and C3. 

EIT had coverage during these times in a good range. There is no apparent signs of any disk activity
which could possibly pertain to the event seen in LASCO.  This event is determined a BACKSIDED HALO
event.

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

http://umbra.nascom.nasa.gov/lasco/observations/halo/2010/100224

Best regards,

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

BT