Subject: SOHO/LASCO HALO CME 130513a

UCMEO 93001 30513 2030/
30513 60224 80618 0702/ 069// 233// 41300
30513 60145 80255 ///// ///// 1112/
99999

PLAIN

SOHO/LASCO observed a HALO CME (A) on May 13, 2013.  Event is first seen in
C2 at 02:24 UT as a bright loop on the East limb. The front expands with
extensions to a full HALO CME by 03:36 UT. The event continues into the C3
field beginning 02:24 to 06:18 UT leaving the C3 field of view at 30Rsun in
the East hemisphere.  

Time/height measurements were marked to 3 points in C2 with speeds of 1395.3 Km/sec
at position angle 70 degrees. The event is marked to 6 points in C3.  Speeds average
through both fields to 1300.1 Km/sec at PA 70 degrees.  Acceleration -43.84 m/sec^2.

SDO/AIA 193A shows a flare from behind the East limb at N12 01:57-02:42 UT. A wave
of material is seen running the east limb, a dimming is seen below the equator
in the SE quadrant. 

STEREO: BEACON Data
COR2 B, 02:24-04:54 UT, a full asymmetric HALO CME with loop starting over the West.  
Preliminary time/height measure gives 1119.6 km/sec velocity at LE. 
EUVI B, 01:45-02:55 UT, a flare of an AR on disk in the NW quadrant at
location [N12, E103].  The flare produces a wave and dimming  and post arcade.

COR2 A, 03:24-04:54 UT,  in progress at first frame. Asymmetric HALO CME over the West.
Preliminary time/height measure gives 1190.7 km/sec velocity at LE. 
EUVI A, n/a

NOAA reports a X1.7 class X-ray flare 01:53/02:17/02:32 UT. This flare appears
to be associated with the flare seen on the limb in the East.
   
The observation of this event is considered 'GOOD'. This CME is determined a 
FARSIDE LIMB event.
There is associated material seen along the limb and on disk in the Southeast.

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

http://umbra.nascom.nasa.gov/lasco/observations/halo/2013/130513a/

Best regards,

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

BT