SOHO/LASCO Partial Halo CME 20140129

Halo Alert: halo-message.20140129

Subject: SOHO/LASCO HALO CME 140129

UCMEO 93001 40129 1930/
40129 60036 80718 1771/ 176// 223// 40792
40128 62000 80151 33239 ///// 2222/
99999

PLAIN

SOHO/LASCO observed an asymmetric HALO CME on January 29, 2014. Event
is first seen in C2 beginning 00:36 UT with a loop over the South pole.
The event expands with extensions to an asymmetric HALO by 02:00 UT.
The event continues into the C3 field beginning 01:30-07:18 UT leaving
the C3 field at 30Rsun in the South.

Time/height measurements were marked at 2 points in C2 with speeds of
519.7 Km/sec at PA 177 degrees. The event is marked to 17 points in C3.
Speeds average through both fields to 792.0 Km/sec at PA 177 degrees.
Acceleration 22.13 m/sec^2.

SDO/AIA 193A shows an elevated filament centered at location [S28, W50]
erupting January 28 23:33-01:45 UT producing an elongated loop.
AIA 304A sees an activated prominence in the SW and across the limb
at [S40]. The channel is approximately centered at location
[S39, W32] that begins eruption at 17:06 UT. The loops break free
20:00-01:51 UT with a primary Southward direction.

STEREO: BEACON data
COR2 A, 22:39-06:54 UT data gap.
EUVI A 195, n/a
COR2 B, 00:55-05:25 UT, asymmetric CME across the South and East.
Preliminary time/height measure gives 929.9 km/sec velocity at LE.
EUVI B 195, n/a.

The observation of this event is considered 'GOOD'. This CME is determined FRONTSIDE.

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

http://umbra.nascom.nasa.gov/lasco/observations/halo/2014/140129/

Best regards,

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

BT