UCMEO 93001 40223 1715/
40221 61824 80018 0001/ 178// 322// 30631
40221 61730 81846 40540 ///// 2212/
99999

PLAIN  


SOHO/LASCO  HALO CME February 21, 2024

C2 Start Time:  18:24 UT

C3 Start Time:  19:18 - 19:54 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  000    pa2:  178      Total Width:  178 degrees

Velocity Measurements:

C2:   7 points  497.8 km/sec @ PA 257.36
C3:   9 points  551.5 km/sec @ PA 257.57
Average through both(C2/C3) fields:  631.5 km/sec  Acceleration: -18.26 m/sec^2

COMMENT:  LASCO C2/C3 show a partial halo CME emerging directly from the W with a bright leading edge. The CME progresses outwards towards the W, with a bright core and cavity and faint leading edges surrounding seen best in C3.  The CME is the result of a filament eruption seen taking off at approximately 17:30 UT, on the western hemisphere of the disk. The eruption is followed by dimming and post eruptive arcades centered at N05W40. 

STEREO Beacon Data COR2 A, due to gaps in data from 02/21/2024 13:23 UT - 02/22/2024  03:23 UT  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/2024/2402121



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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