Subject: SOHO/LASCO HALO CME 100814

UCMEO 93001 00815 1835/
00814 61012 81542 2111/ 090// 323// 30946
00814 60925 81035 45612 11093 1112/
99999

PLAIN

SOHO/LASCO observed a partial asymmetric HALO CME (type P) on August 14, 2010.  Event is
first seen in C2 at 10:12 UT as a bright elongated loop over the west limb centered at
PA 257 degrees. The bulk of the material expands over the west with extensions over the
north and northeast out to the equator. There is a faint impulsive shift in the south
and lower southeast that does not seem to be part of the CME but most probably is 
reaction to the event.  The CME spans PA 211 - 90 degrees for a total 239 degrees wide.  
The event  continues into the C3 field first frame of 10:42 UT and tracked to 15:42 UT to 28.4 Rsun. 

Time/height measurements were marked to 6 points in C2 with speeds of 754 km/sec, the event
 accelerates in C3, marked at 18 points and calculated to velocities averaging thru both fields
to 946.6 Km/sec at position angle 243 degrees.    

STEREO Ahead EUVI 195A beacon data shows AR 11093 in its east field with a CME/dimming along
with a small southward SECCI wave beginning at 09:25-10:35 UT.
NOAA reports a C4.4 Xray flare of AR 11093 beginning at 09:38 UT, located at [N12, W56]. This flare
is most probably associated with and/or triggered by the event seen in LASCO.
   
The observation of this event is considered 'fair'. 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/2010/100814/

Best regards,

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

BT