SOHO/LASCO Halo CME 20230509

Halo Alert: halo-message.20230509

UCMEO 93001 ///// /////
30509 61912 82024 0001/ 360// 233// 41042
40509 61820 81924 41336 13296 1212/
99999

PLAIN

SOHO/LASCO HALO CME May 09 2023 FRONTSIDE

C2 Start Time:   19:00 UT

C3 Start Time: 19:18 UT.

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

Velocity Measurements:

C2 5 points 903.4 km/s @ PA 304.64
C3 12 points 1029.1 km/sec @ PA 304.55 Acceleration: -21.18 m/sec^2.
Average through both fields: 1042.8 km/sec @ PA 304.58 Acceleration: -12.85 m/sec^2.

COMMENT: LASCO C2/C3 shows a full halo CME with a bright leading edge originating in the NW direction.

NOAA/GOES reports a M4.2 flare from AR 3296 18:20/18:58/19:24 UT.

STEREO Beacon Data
COR2 A, shows a bright loop CME over the West 19:23 - 21:23 UT.
Preliminary time/height measure gives 1475.8 km/sec @ 312 degrees.

Preliminary UCMEO velocity and position measurements will be delivered first.

Best Regards,

--James Tabourne

BT

[Images from original message are omitted here]

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