Subject: SOHO/LASCO HALO CME 131024

UCMEO 93001 31024 1940/
31024 60125 80754 2251/ 224// 113// 30535
31024 60018 80103 20812 11877 1212/
99999

PLAIN

SOHO/LASCO observed an asymmetric HALO CME on October 24, 2013.  Event is first
seen in C2 at 01:25 UT as a faint HALO CME at first frame. The event continues
into the C3 field beginning 02:06 to 07:54 UT where it dissipates at 16Rsun.

Time/height measurements were marked to 4 points in C2 with speeds of 699.3 Km/sec
at position angle 225 degrees. The event is marked to 4 points in C3.  Speeds average
through both fields to 534.5 Km/sec at PA 225 degrees.  Acceleration -30.12 m/sec^2.


SDO/AIA 193A shows a flare with emission at location [S12, E08] from AR 11877 beginning 
00:18-01:03 UT.  The CME produces a dimming around the region.

STEREO: BEACON Data
COR2 A, 01:24-05:54 UT faint asymmetric halo. 
Preliminary time/height measure gives 568.2 km/sec velocity at LE.
EUVI A, n/a.
COR2 B, 23:55-10:25 UT data gap. n/a.
EUVI B, 00:06-10:06 UT data gap. n/a.

NOAA reports a M9.3 Xray flare 00:21/00:30/00:35 UT from AR 11877 at location [S10, E08].

The observation of this event is considered 'FAIR'. 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/2013/131024/

Best regards,

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

BT