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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