SOHO/LASCO HALO CME 111126

UCMEO 93001 11127 1715/
11126 60700 81354 2811/ 280// 333// 40783
11126 60636 80721 44827 ///// 2212/
99999

PLAIN

SOHO/LASCO observed an asymmetric HALO CME on November 26, 2011.
Event is first seen in C2 at 07:00 UT as a small loop front 
over the west equator line.  Event progresses to a defined loop
with cavity and core.  Extensions expand to full halo CME by 08:36 UT.
Event continues into the C3 field beginning 07:42-13:54 UT to 30 Rsun.

Time/height measurements were marked at 6 points in C2 with speeds of 570.0 Km/sec
at position angle 281 degrees. The event is marked to 12 points in C3 where
it accelerates.  Speeds average through both fields to 783.2 Km/sec at PA 277 degrees.
Acceleration of 3.80 m/sec^2.

SDO/AIA 193/304 06:36-07:21 UT shows an eruption of the lower end of the filament
crossing the NW located [N27,W48] above and adjacent to AR 11355. It appears
as a dual ribbon event finishing with a long duration arcade.

STEREO: Beacon data
COR2 B,  06:55-12:25 data gap. 
EUVI B 195, Nothing on disk.
COR2 A, 07:24 UT large loop burst in east hemisphere with cavity and core.
Progresses to full asymmetric halo.
Preliminary time/height measure give 970.3 km/sec velocity at LE.
EUVI A 195, 06:36-07:25 UT darkening near NE limb above equator.


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/2011/111126/

Best regards,

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

BT