UCMEO 93001 40122 0440/
40120 60848 81354 0151/ 222// 223// 40836
40120 60827 80857 215000 ///// 2112/
99999
PLAIN
SOHO/LASCO HALO CME January 20, 2024
C2 Start Time: 8:48 - 9:12 UT
C3 Start Time: 9:30 UT
Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 015 pa2: 222 Total Width: 360 degrees
Velocity Measurements:
C2: 7 points 766.6 km/sec @ PA 125.63
C3: 11 points 793.8 km/sec @ PA 125.72
Average through both(C2/C3) fields: 836.1 km/sec
Acceleration: -13.95 m/sec^2
COMMENT: LASCO C2/C3 show a halo CME emerging from the SE
with a bright leading edge. The bulk of the halo CME propagates
outwards in the east and south direction. The halo CMEs source is a
filament eruption on the Earth-facing disk at S15E00 to S15E35.
The filament begins to detach at 8:27 UT seen best on SDO AIA 193, 131.
The event is followed by post-eruptive arcades and dimming in the
region.
STEREO Beacon Data COR2 A, due to gaps in data from 10:38 - 15:23 UT,
only the beginning of the CME could be captured. Preliminary
time/height at 5 points of measurement gave 797.8 km/sec@ PA 99.74.
STEREO COR2A shows a partial halo CME emerging from the SE at
approximately 9:23 UT. The CME continues to propagate outwards in the
east direction before the gap in data beginning at 10:38 UT.
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/2024/240120
Best Regards,
--James Tabourne
BT
[Images from original message are omitted here]
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