SOHO/LASCO Halo CME 20230522

Halo Alert: halo-message.20230522

UCMEO 93001 ///// /////
30522 60000 80212 3371/ 337// 113// 30859
30522 ///// ///// ///// ///// /////
99999

PLAIN

SOHO/LASCO HALO CME May 22, 2023 BACKSIDE

C2 Start Time:   00:00 UT

C3 Start Time: 00:18-00:30 UT.

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

Velocity Measurements:

C2 5 points 848.1 km/s @ PA 58.58
C3 11 points 851.0 km/sec @ PA 58.34 Acceleration: -17.15 m/sec^2.
Average through both fields: 859.4 km/sec @ PA 58.41 Acceleration: -11.28 m/sec^2.

COMMENT: LASCO C2/C3 shows a symmetric full halo with the core propagating toward the NE.

STEREO Beacon Data
COR2 A, shows a bright full halo CME with core in the NE 00:23 - 2:53 UT.
Preliminary time/height measure gives 728.0 km/sec @ 22 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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SOHO/LASCO C2 Diff
SOHO/LASCO C3 Diff
SOHO/LASCO C2

STEREO/COR2 AHEAD Diff STEREO/COR2 AHEAD
STEREO/COR2 BEHIND

SOHO/LASCO C3