UCMEO 93001 40105 1710/
40104 60000 80418 0002/ 360// 112// 30470
40104 ///// ///// ///// ///// /////
99999

PLAIN  


SOHO/LASCO  HALO CME January 4, 2024

C2 Start Time:  00:00 UT

C3 Start Time:  00:30 UT

Type of CME:
Asymmetric HALO CME — BACKSIDE
pa1:  000    pa2:  360       Total Width:  360 degrees

Velocity Measurements:

C2:   5 points     518.3 km/sec @ PA 15.26
C3:   11 points   440.1 km/sec @ PA 15.54
Average through both(C2/C3) fields:  470.2 km/sec  Acceleration: -14.77 m/sec^2

COMMENT:  LASCO C2/C3  show a very faint halo CME. The CME emerges with a bright leading edge from the north east direction. The halo CME propagates outward in all directions with very faint lines seen best in C3.The halo CMEs source is a far-sided eruption, evidence of opening field lines seen beyond the NE limb beginning at 02/03 23:24 UT seen best in SDO AIA 171.

STEREO Beacon Data COR2 A, due to gaps in data from 19:38 - 00:53 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/2024/240104



Best Regards,

--James Tabourne

BT
[Images from original message are omitted here]

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