UCMEO 93001 40215 1600/
40214 60412 80818 0002/ 360// 233// 31947
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99999

PLAIN  


SOHO/LASCO  HALO CME February 14, 2024

C2 Start Time:  4:00 - 4:12 UT

C3 Start Time:  3:54 - 4:30 UT

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

Velocity Measurements:

C2:   1 point  ***.* km/sec @ PA 192
C3:   6 points  1841.0 km/sec @ PA 192.42
Average through both(C2/C3) fields:  1947.1 km/sec  Acceleration: **** m/sec^2

COMMENT:  LASCO C2/C3 show a full halo CME emerging from the SW with a bright leading edge and core. The bulk of the CME propagates in the SW direction but also wraps around to the NE making it a full halo as it progresses outwards. The progression to a full halo occurs by 4:48 UT in C2 and 5:30 UT in C3. The CME is the result of a far sided eruption as evidence of opening field lines and an EUV wave observed beyond the SW limb beginning at 3:51 UT best seen in SDO AIA 171/193.


STEREO Beacon Data COR2 A, preliminary time/height measurements gives a velocity of 1962.9 km/s at a PA of 197.57. STEREO COR2A shows a bright halo emerging from the SW at 4:23UT. The CME progresses outwards in all directions with majority of the  CME being in the SW. As the CME propages outwards it wraps around to the NE 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/2024/2402114



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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