SOHO/LASCO Halo CME 20121123b

Halo Alert: halo-message.20121123b

Subject: SOHO/LASCO HALO CME 121123b BACKSIDED

UCMEO 93001 21124 1730/
21123 62324 80411 3172/ 316// 323// 31278
21123 62256 82336 ///// ///// 1112/
99999

PLAIN

SOHO/LASCO observed a second HALO CME (B) on November 23, 2012. Event
is first seen in C2 at 23:24 UT as a loop surfacing over the Northwest
limb with cavity and core. The event expands to a full asymmetric halo
CME by 00:06 UT. The event continues into the C3 field beginning 23:54
to 04:18 UT leaving the C3 field at 30 Rsun in the Northwest.

Time/height measurements were marked to 3 points in C2 with speeds
of 1433.2 Km/sec at position angle 317 degrees. The event is marked to 7 points
in C3. Speeds average through both fields to 1278.4 Km/sec at PA 317 degrees.
Acceleration -64.97 m/sec^2.

SDO/AIA : CME is seen over the NW limb in difference images 23:00-23:42 UT.

STEREO: Beacon data
COR2 A, 22:24-04:39 UT data gap. n/a
EUVI A 195, n/a
COR2 B, 00:25 UT in progress at first frame. A partial halo over East
Preliminary time/height measure gives 1250.5 km/sec velocity at LE.
EUVI A 195, shows a flare with CME on limb in NE 22:56-22:36 UT with wave.

The observation of this event is considered 'FAIR'. This CME is determined a BACKSIDED 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/2012/121123b

Best regards,

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

BT

SOHO/LASCO C2 Diff	SOHO/LASCO C3 Diff



STEREO/COR2 BEHIND	STEREO/EUVI 195A BEHIND

Time/Height Velocities and Plots

C2/C3

Click on Links below for additional information.

Halo Alert: halo-message.20121123b

MPEG Movies

LASCO Software IDL Save Files (.mvi)