Subject: SOHO/LASCO HALO CME 131022b

UCMEO 93001 31023 1640/
31022 62148 80654 2171/ 216// 113// 30562
31022 62115 82136 40004 11875 1112/
99999

PLAIN

SOHO/LASCO observed an asymmetric HALO CME on October 22, 2013.  Event is first seen in
C2 at 21:48 UT as a faint loop over the South.  The event expands with extensions
to a full halo by 22:24 UT. The event continues into the C3 field beginning
22:30 to 06:54 UT leaving the field of view at 30Rsun in the South. 

Time/height measurements were marked to 5 points in C2 with speeds of 657.6 Km/sec
at position angle 217 degrees. The event is marked to 11 points in C3.  Speeds average
through both fields to 561.5 Km/sec at PA 217 degrees.  Acceleration 0.32 m/sec^2.


SDO/AIA 193A shows a flare of an emerging flux region at location [N04, W00] West of
and adjacent to AR 11875 beginning 21:15-21:36 UT.  The flare produces a dimming
and a wave across the Southern hemisphere.

STEREO: BEACON Data
COR2 B, 22:40 UT image shows an expanding loop over the West and Southwest. A data
gap starts 22:55-05:55 UT.  
Preliminary time/height measure. n/a.
EUVI B, n/a
COR2 A, 14:54-04:39 UT data gap. n/a
EUVI A,  n/a.

NOAA reports a M4.2 Xray flare 21:15/21:20/21:22 UT from AR 11875.  This report
is associated with the flare seen in AIA data.

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/2013/131022b/

Best regards,

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

BT