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PLAIN  


SOHO/LASCO  HALO CME February 15, 2024

C2 Start Time:  9:12 - 9:24 UT

C3 Start Time:  9:30 - 9:42 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  000    pa2:  360      Total Width:  360 degrees

Velocity Measurements:

C2:   2 points  1677.4 km/sec @ PA 179.15
C3:   8 points  1764.0 km/sec @ PA 179.26
Average through both(C2/C3) fields:  1791.4 km/sec  Acceleration: -48.75 m/sec^2

COMMENT:  LASCO C2/C3 show a full halo CME which emerges from the S with a bright leading edge and core. The CME progresses outwards in alll directions with the bulk of the CME being in the S direction. The CME is the result of a far sided eruption as evidence of wide opening field lines observed beyond the S limb beginning at 9:06 UT best seen in SDO AIA 171/193.

STEREO Beacon Data COR2 A, preliminary time/height measurements gives a velocity of 1729.2 km/s at a PA of 180.44. STEREO COR2A shows a bright halo emerging from the S at 9:23UT. The CME progresses outwards in all directions with majority of the  CME being in the S. As the CME propages outwards it wraps around to the N into a full halo.

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/2024/2402115



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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