Subject: SOHO/LASCO Partial HALO CME 140120a BACKSIDED

UCMEO 93001 40121 1830/
40120 61524 82142 3432/ 216// 113// 30732
40120 61436 81526 ///// ///// 1112/
99999

PLAIN

SOHO/LASCO observed an Partial HALO CME [A] on January 20, 2014.
Event is first seen in C2 beginning 15:24 UT with loops over the East.
The event expands with extensions PA 343-216 degrees for total coverage
of 233 degrees in width. The event continues into the C3 field beginning
15:54-21:42 UT dissipating at 24Rsun in the East. 

Time/height measurements were marked at 5 points in C2 with speeds of
801.9 Km/sec at PA 64 degrees. The event is marked to 11 points in C3.  
Speeds average through both fields to 732.4 Km/sec at PA 64 degrees.
Acceleration -25.96 m/sec^2. 


STEREO: BEACON data
COR2 B,  15:55-20:25 UT partial halo over the Northwest. 
Preliminary time/height measure gives 654.6 km/sec velocity at LE.
EUVI B 195, 14:36-15:26 UT flare of an active region  on disk
in the SE quadrant at location [S15, E176].
The event produces a dimming and wave followed by a post arcade.
COR2 A, 12:24-19:39 UT data gap. n/a 
EUVI A 195, 12:25-19:25 UT data gap. n/a

The observation of this event is considered 'GOOD'. This CME is determined BACKSIDED.

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

http://umbra.nascom.nasa.gov/lasco/observations/halo/2014/140120a/

Best regards,

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

BT