SOHO/LASCO Halo CME 20240102

Halo Alert: halo-message.20240102

UCMEO 93001 40103 0330/
40102 61100 81730 1742/ 350// 222// 30591
40102 ///// ///// ///// ///// /////
99999

PLAIN

SOHO/LASCO HALO CME January 2, 2024

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

C3 Start Time: 11:30 UT

Type of CME:
Asymmetric HALO CME — BACKSIDE
pa1: 174    pa2: 350       Total Width: 176 degrees

Velocity Measurements:

C2:   5 points     679.1 km/sec @ PA 263.46
C3:   17 points   581.6 km/sec @ PA 263.59
Average through both(C2/C3) fields: 591.7 km/sec Acceleration: -8.96 m/sec^2

COMMENT: LASCO C2/C3 show a asymmetric patial halo CME. The CME emerges with a bright leading edge from the south west direction. The halo CME propagates outward towards the west relatively slowly, with no presence in the east.The halo CMEs source is a far-sided eruption, evidence of faint field line movement visible beyond the SW limb at 10:54 UT as best seen in SDO AIA 171.

STEREO Beacon Data COR2 A, due to gaps in data from 10:53 - 13:23 UT, only the ending of the CME could 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/2023/240102

Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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