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PLAIN  


SOHO/LASCO  HALO CME February 18, 2024

C2 Start Time:  9:48 - 10:00 UT

C3 Start Time:  10:06 - 10:18 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  14    pa2:  292      Total Width:  278 degrees

Velocity Measurements:

C2:   3 points  1379.7 km/sec @ PA 155.70
C3:   10 points  1067.6 km/sec @ PA 155.36
Average through both(C2/C3) fields:  1092.6 km/sec  Acceleration: -29.68 m/sec^2

COMMENT: LASCO C2/C3 show a partial halo CME emerging from the SE with a bright leading edge and core. The CME progresses outwards in all directions with the bulk of the CME being in the SE direction.The CME is the result of a backsided eruption beyond the SE limb, seen as opening field lines starting at 9:37 UT.

STEREO Beacon Data COR2 A, shows a partial halo emerging from the SE. The halo expands outwards in all directions but never fully wraps to the NE into a full halo only the ending of the halo CME could be captured .Preliminary time/height measurements give a velocity of 1074.0 km/s at PA 160.25.

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/2024/2402118



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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