SOHO/LASCO Halo CME 20240129

Halo Alert: halo-message.20240218

UCMEO 93001 40219 2200/
40218 6948 81430 0142/ 292// 233// 31092
40218 ///// ///// ///// ///// /////
99999

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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