UCMEO 93001 40115 1930/
40114 61148 81618 1321/ 308// 213// 40776
40114 61130 81222 40189 13543 1212/
99999

PLAIN  


SOHO/LASCO  HALO CME January 14, 2024

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

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

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1:  132    pa2:  308       Total Width:  184 degrees

Velocity Measurements:

C2:   5 points     728.5 km/sec @ PA 256.48
C3:   12 points   771.1 km/sec @ PA 256.57
Average through both(C2/C3) fields:  776.7 km/sec  Acceleration: -7.56 m/sec^2

COMMENT:  LASCO C2/C3  show a bright partial halo CME. The CME emerges with a bright leading edge and core from the south west direction and continues to propagate towards that direction. The partial halo has bulk presence in the south west while never fully wrapping around into a full halo. The halo CMEs source is associated with AR 13543 which recently rotated off the limb, beginning at 11:30 UT seen best in SDO AIA 171,193.

LASCO shows extreme proton flux in the field of view. (SEP)

NOAA/GOES reports a C9.6 flare from AR 13543 11:30/12:06/12:22 UT

STEREO Beacon Data COR2 A, due to gaps in data from 10:38 - 15:53 UT, the CME could not be captured. Preliminary time/height could not be gathered at this time.

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/2024/240114



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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