SOHO/LASCO Halo CME 20240129

Halo Alert: halo-message.20240508

UCMEO 93001 40508 2100/
40508 61212 81754 0001/ 360// 113// 30700
40508 61126 81222 32011 13664 1222/
99999

PLAIN

SOHO/LASCO HALO CME March 23, 2024

C2 Start Time: 12:12 - 12:36 UT

C3 Start Time: 12:54 - 13:06 UT

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

Velocity Measurements:

C2:   4 points    851.0 km/sec @ PA 182.27
C3:   13 points 677.7 km/sec @ PA 182.45
Average through both(C2/C3) fields: 700.0 km/sec Acceleration: -21.94 m/sec^2

COMMENT: LASCO C2/C3 shows a full halo CME emerging from all directions with faint leading edges. The halo CME is nearly symmetric with slight skewness to the S. The halo CME's source is a M8.7 flare centered on S20W11(AR 3664) best seen in SDO AIA 131. The flare was accompanied by an EUV wave and field line movements.

NOAA/GOES reports a M8.7 flare from S20W11(AR 3664) 11:26/12::04/12:22 UT

STEREO Beacon Data COR2 A, preliminary time/height measurements gives a velocity of 772.9 km/sec at a PA of 181.43. Stereo COR2-A shows a full halo CME with faint leading edges emrging from 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/2024/240508_b

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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