SOHO/LASCO Halo CME 20231213

Halo Alert: halo-message.20231213

UCMEO 93001 31215 0330/
31213 60000 80442 1451/ 354// 112// 30398
31213 62229 80029 40625 13514 1212/
99999

PLAIN

SOHO/LASCO HALO CME December 13, 2023

C2 Start Time: 00:00 UT

C3 Start Time: 00:30 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 145    pa2: 354      Total Width: 209 degrees

Velocity Measurements:

C2:   8 points 412.3 km/sec @ PA 288.46
C3:   8 points   400.6 km/sec @ PA 288.59
Average through both(C2/C3) fields: 398.6 km/sec Acceleration: -3.77 m/sec^2

COMMENT: LASCO C2/C3 show a very faint partial halo CME. The CME emerges from the W and propagates outward in that direction. The partial halo CMEs source is a C2.9 flare centered on N06W25(3514) .A double ribbon flare/surface brightening is observed in the region best seen in SDO AIA 304, along with post-eruptive arcade.

NOAA/GOES reports a C2.9 flare from AR 13514 22:29/22:55/00:29 UT

STEREO Beacon Data COR2 A, shows a partial halo CME emerging from W, starting between 00:53 - 1:23UT. Preliminary time/height measurements gives a velocity of 364.2 km/sec @ PA 283.55 using 4 points of measurement.

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/2023/231213

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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