Subject: SOHO/LASCO HALO CME 101006

UCMEO 93001 01006 2315/
01006 60648 81742 0481/ 047// 313// 40257
01006 60331 81035 15234 ///// 2212/
99999

PLAIN

SOHO/LASCO observed an asymmetric HALO CME on October 06, 2010.  Event is first seen in 
C2 at 06:48 UT as a faint but defined loop over the east limb centered at PA 48 degrees. 
A slow expanding loop system with cavity and core shows counter-clockwise rotation.  This
event eventually develops to a faint FULL HALO CME with associated material seen at all 
angles by 12:48 UT in C2.  The event is seen in first frame of C3 at 09:42 UT and tracked
out to 17:42 UT at 15.2 Rsun where the event dissipates.
 
Time/height measurements were marked to 21 points in C2 with speeds of 185.4 km/sec, the event
accelerates in C3, marked at 25 points and calculated to velocities averaging thru both fields
to 257.1 Km/sec at position angle 49 degrees.    

SDO AIA 193A shows a long aggravated filament in the Northeast field centered at[34N,52E].
The filament begins eruption approximately October 6, 2010 03:31 UT.  A dimming is seen
along the channel as the eruption begins preceding a mild ribbon/arcade.  The eruption
seems to end about 10:35 UT. This long duration may be the factor causing the dim material
in the southwest quadrant in C2.  This filament eruption is most probably the cause of the 
event seen in LASCO.
   
The observation of this event is considered 'good'. This CME is determined a FRONTSIDED event. 

Images and movies and time/height information for this event is available on the web at:

http://umbra.nascom.nasa.gov/lasco/observations/halo/2010/101006/

Best regards,

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

BT