Subject: SOHO/LASCO HALO CME 110214

UCMEO 93001 10215 1800/
10214 61912 80106 3471/ 346// 113// 20198
10214 61723 81727 31420 11158 1112/
99999

PLAIN

SOHO/LASCO observed a HALO CME on February 14, 2011.  Event is first seen in 
C2 at 18:12 UT as a faint first LE loop over the northern hemisphere.  A second
loop system is seen at 19:12 UT which is a faint full 360 degree halo emission.  
The majority of the material propagates north.  Faint scattered material is seen 
in the C3 field over the North beginning 21:54 to 01:06 to approximately 7.00 Rsun.  

Time/height measurements were marked to 12 points in C2 with speeds of 215.1 Km/sec 
at position angle 4 degrees. The event slightly decelerates into C3.  Speeds average
through both fields to 197.8 Km/sec at PA 5 degrees.    

SDO/AIA shows a bright flare of AR 11158 located at [S20, W14] on disk begining 17:23-17:27 UT.
This flare produced an AIA wave with the majority of the expansion Northward. 
NOAA reports a M2.2 Xray flare of AR 11158 beginning at 17:20-17:26 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/2011/110214/

Best regards,

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

BT