Subject: SOHO/LASCO Partial HALO CME 110213

UCMEO 93001 10214 2035/
10213 61836 82218 2571/ 093// 113// 20183
10213 61731 81740 30319 11158 1112/
99999

PLAIN

SOHO/LASCO observed a partial HALO CME on February 13, 2011.  Event is first seen in 
C2 at 18:36 UT as a weak elongated loop over the northern hemisphere with disrupted 
progression due to small single equatorial events near the limbs. The event begins to 
dissipate in the C2 field. Material is seen from 275 - 93 degrees for a total of 196 
degrees wide.  Faint scattered material is seen in the C3 field over the North
beginning 20:24 to 22:18 to approximately 6 Rsun.  There is no defined LE of the 
system in C3 field.

Time/height measurements were marked to 7 points in C2 with speeds of 183.3 Km/sec at position
angle 4 degrees.    

SDO/AIA shows a bright flare of AR 11158 located at [S19, W03] on disk begining 17:31 - 17:40 UT.
This flare produced a symmetric SDO wave with the majority of the expansion Northward. 
NOAA reports a M6.6 Xray flare of AR 11158 beginning at 17:28 - 17:38 UT. This is most probably
the cause of the event seen in LASCO.
   
The observation of this event is considered 'poor'. 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/2011/110213/

Best regards,

Kevin Schenk
Solar Heliospheric Observatory
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA

BT