Subject: SOHO/LASCO HALO CME 130315

UCMEO 93001 30315 1940/
30315 60712 81354 0801/ 079// 323// 40980
30315 60601 80719 11211 11692 1112/
99999

PLAIN

SOHO/LASCO observed a symmetric HALO CME on March 15, 2013.  Event is first seen in
C2 at 07:12 UT as a bright loop with leading edge to 3.8 Rsun in first frame.
The event continues into the C3 field beginning 07:30 to 13:54 UT leaving the C3
field of view at 30Rsun. 

Time/height measurements were marked to 3 points in C2 with speeds of 997.2 Km/sec
at position angle 80 degrees. The event is marked to 8 points in C3.  Speeds average
through both fields to 980.3 Km/sec at PA 80 degrees.  Acceleration 33.12 m/sec^s.


SDO/AIA 193 shows expanding loops of AR 11692 [N11, E12] beginning 06:03 UT.
AIA begins an eclipse outage 06:24-07:39 UT.
PROBA2/SWAP 174 shows a flare of AR 11692 near disk center 06:01-07:19 UT which
produces a wave and dimming around the region followed by a bright post loop
arcade.

STEREO: BEACON Data
COR2 A, 06:54-09:24 UT expanding asymmetric halo CME (East).
Preliminary time/height measure gives 1049.1 km/sec velocity at LE. 
EUVI A, n/a
COR2 B, 06:55-09:25 UT expanding asymmetric halo CME (West).
Preliminary time/height measure gives 1092.3 km/sec velocity at LE.  
EUVI B,  A CME over the West limb beginning 06:06-07:36 UT.

NOAA reports a long duration M1.1 Xray flare 05:36/06:38/08:35 from AR 11692
at location [N11, E12]   

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/2013/130315/

Best regards,

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

BT