UCMEO 93001 40216 1800/
40216 60125 80518 0002/ 360// 233// 31719
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99999

PLAIN  


SOHO/LASCO  HALO CME February 16, 2024

C2 Start Time:  1:25 UT

C3 Start Time:  1:42 UT

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

Velocity Measurements:

C2:   2 points  1568.8 km/sec @ PA 169.05
C3:   8 points  1688.7 km/sec @ PA 169.61
Average through both(C2/C3) fields:  1719.5 km/sec  Acceleration: -45.07 m/sec^2

COMMENT:  LASCO C2/C3 show a full halo CME emerging from the S with a bright leading edge and core. The CME progresses outwards in all directions with the bulk of the CME being in the S direction. The CME can be seen wrapping around the N into a full halo by 2:48 UT in C2 imagery. The CME is the result of a backsided eruption likely from AR 13575, evidence of opening field lines beyond the southern limb starting around 1:15 UT seen best in SDO AIA 173.

STEREO Beacon Data COR2 A, due to gaps in data from 02/15/2024 12:53 UT - 02/16/2024  02:53 UT only the ending of the halo CME could be captured .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/2024/2402116



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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