SOHO/LASCO Halo CME 20240206

Halo Alert: halo-message.20240206

UCMEO 93001 40206 2000/
40206 61148 9///// 0001/ 360// 233// 40910
40206 61000 81405 ///// ///// 2112/
99999

PLAIN

SOHO/LASCO HALO CME February 6, 2024

C2 Start Time: 11:48 - 12:00 UT

C3 Start Time: 12:18 - 12:30 UT

Type of CME:
Symmetric HALO CME — FRONTSIDE
pa1: 000    pa2: 360      Total Width: 245 degrees

Velocity Measurements:

C2:   4 points 945.6 km/sec @ PA 268.45
C3:   8 points 890.4 km/sec @ PA 268.33
Average through both(C2/C3) fields: 910.5 km/sec Acceleration: -31.38 m/sec^2

COMMENT: LASCO C2/C3 show a full halo CME emerging from all directions. Bright opening lines are seen towards the E, while more faint lines are toward the W. The CME is relatiely symmetrical as it propagates outwards in all directions. The source of the halo CME is likelu a filament eruption on the northern hemisphere of the disk seen lifting off beginning at 10:00 UT seen best in SDO AIA 71.

STEREO Beacon Data COR2 A, Preliminary time/height at 7 points of measurement gives a velocity of 726.1 km/s @PA 89.66. STEREO COR2A shows a halo CME emerging from the all directions beginning at approximately 12:23 UT. The halo CME propagates outwards in all directions.

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/2024/240206_b

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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