Subject: SOHO/LASCO HALO CME 140305b BACKSIDED

UCMEO 93001 40306 1330/
40305 61348 81406 0202/ 019// 223// 40997
40305 61326 81356 ///// ///// 1112/
99999

PLAIN

SOHO/LASCO observed a HALO CME [B] on March 05, 2014.  Event is first seen
in C2 at 13:48 UT as a loop over the North. A full asymmetric HALO develops
with cavity and core by 14:12 UT.  The event continues into the C3 field
beginning 14:06 to 20:06 UT leaving the C3 field at 30 Rsun in the North. 

Time/height measurements were marked to 3 points in C2 with speeds 
of 1026.8 Km/sec at position angle 20 degrees. The event is marked to 7 points 
in C3. Speeds average through both fields to 997.1 Km/sec at PA 20 degrees.  
Acceleration 43.55 m/sec^2.


STEREO: Beacon Data
COR2 A, 13:39-15:39 UT expanding loop over the North and West.
Preliminary time/height measure gives 931.0 km/sec velocity at LE. 
EUVI A, 13:25-13:55 UT bright flare from AR on disk in the NW.
A transient dimming and wave are seen propagating outward.  
COR2 B, 13:55-17:25 UT expanding partial halo Northward.
Preliminary time/height measure gives 921.4 km/sec velocity at LE.
EUVI B, 13:26-13:56 UT bright flare of an AR on disk in NE quadrant
with dimming and wave.


The observation of this event is considered 'Good'. This CME is determined a BACKSIDED 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/2014/140305b/

Best regards,

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

BT