Subject: SOHO/LASCO Partial HALO CME 121005

UCMEO 93001 21006 1730/
21005 60248 81230 1241/ 325// 323// 40452
21005 60257 81150 11584 32030 2212/
99999

PLAIN

SOHO/LASCO observed a Partial HALO CME on October 05, 2012.  Event is first seen in
C2 at 02:48 UT as a loop appearing over the South-pole. The event develops 
multi-loops with cavity and core. The front expands with extensions PA 124-325 degrees
for total coverage of 201 degrees in width. The event continues into the C3 field
beginning 04:42 to 12:30 UT leaving the C3 field of view at 30Rsun in the South. 

Time/height measurements were marked to 6 points in C2 with speeds of 368.6 Km/sec
at position angle 201 degrees. The event is marked to 9 points in C3.  Speeds average
through both fields to 452.2 Km/sec at PA 201 degrees.  Acceleration 4.99 m/sec^s.


SDO/AIA 193 shows  a dimming along a filament channel 02:39-09:33 UT along [S35] East 
of and adjacent to AR 11584 the AR is currently at location [S22, W38].
304 shows ribbon flaring on disk along a filament channel West to East in the SW quadrant
beginning 02:57-11:48 UT with post loop arcade.
The filament channel is located at and centered on [S30,W20].


STEREO: BEACON Data
COR2 A, 10/4 22:24-03:24 UT data gap. In progress, 03:24 UT loop with cavity
and core in the SE.
Preliminary time/height measure gives 530.5 km/sec velocity at LE. 
EUVI A, 10/4 22:15-03:25 UT data gap. In progress, CME 04:24-07:15 UT with post loops
at 09:45-12:35 UT from region over SE limb.
COR2 B, 10/4 22:40-04:55 UT data gap.  In progress, 04:55 loop(s) expanding over the West
hemisphere.
Preliminary time/height measure gives 568.2 km/sec velocity at LE.
EUVI B, 10/4 22:46-04:55 UT data gap.  n/a

NOAA reports a long duration B7.8 Xray flare of AR 11584 03:17/07:30/10:46 UT.  This report
appears to be associated with the on disk flaring of the filament.
   
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/2012/121005/

Best regards,

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

BT