Subject: SOHO/LASCO HALO CME 140304 BACKSIDED

UCMEO 93001 40305 1530/
40304 61848 80042 3452/ 344// 123// 31109
///// ///// ///// ///// ///// /////
99999

PLAIN

SOHO/LASCO observed an asymmetric HALO CME on March 04, 2014.  Event is
first seen in C2 beginning 18:48 UT with a loop over the North Pole.
The event expands with extensions to a full HALO by 19:24 UT. The
event continues into the C3 field beginning 19:16-00:42 UT leaving
the C3 field at 30Rsun in the North. 

Time/height measurements were marked at 2 points in C2 with speeds of
1767.4 Km/sec at PA 345 degrees. The event is marked to 7 points in C3.  
Speeds average through both fields to 1108.6 Km/sec at PA 345 degrees.
Acceleration -72.00 m/sec^2. 

SDO/AIA 193A shows a wave of material and dimming across the limb
in the North polar region 18:36-19:33 UT. 

STEREO: BEACON data
COR2 A,  13:54-24:55 UT data gap.
EUVI A 195, 14:15-21:05 UT data gap.
COR2 B, 17:25-22:55 UT data gap.
EUVI B 195, 17:16-21:56 UT data gap.


The observation of this event is considered 'FAIR'. 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/2014/140304/

Best regards,

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

BT