UCMEO 93001 40101
1600/
31231 62148 80054 0001/ 215// 133// 32427
31231 62136 82213 10479 13536 1112/
99999
PLAIN
SOHO/LASCO HALO CME December 31, 2023
C2 Start Time: 21:48 - 22:00 UT
C3 Start Time: 21:54 - 22:18 UT
Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 000 pa2: 215
Total Width: 215 degrees
Velocity Measurements:
C2: 1 point *** km/sec @ PA 95.59
C3: 5 points 2355.8 km/sec @ PA 95.34
Average through both(C2/C3) fields: 2427.2 km/sec
Acceleration: -51.76 m/sec^2
COMMENT:
LASCO C2/C3 show a very fast moving partial halo CME, emerging
directly from the east. In C3 imagery, the CME appears at 22:18 UT and
quickly envelops the whole east side by 23:06 UT. The CME
propagates outwards prmarily in the east direction and mostly
dissipates by 01:00 UT. The
source is associated with a X5.0 flare centered on N04E79(AR 3536) on
the east limb. In SDO AIA 193 , an EUV wave can be seen following the
flare moving
west along the disk. Opening field lines can also be seen behind the
east limb in AIA 193 starting at 21:42 UT.
NOAA/GOES
reports a X5.0 flare from AR 13536 21:36/21:55/22:13 UT
STEREO
Beacon Data COR2 A, due to gaps in data from 18:53 - 00:53 UT, preliminary
time/height
measurements could not be performed at this time.
Preliminary UCMEO velocity and position measurements are delivered
first.
Images, movies, and time/height information for this event will be
available at:
https://umbra.nascom.nasa.gov/lasco/observations/halo/2023/231231
Best Regards,
--James Tabourne
BT
[Images from original message are omitted here]
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