UCMEO 93001 50105
1800/
50104 61836 82036 2651/ 265// 333// 41498
50104 61823 82031 31958 13939 1112/
99999
PLAIN
SOHO/LASCO HALO CME January 4, 2025
C2 Start Time: 18:36 UT
C3 Start Time: 18:54 - 22:54 UT
Type of CME:
Partial Asymmetric HALO CME — FRONTSIDE
pa1: 265 pa2: 265
Total Width: 360 degrees
Velocity Measurements:
C2: 3 points 1118.6 km/sec @ PA 265.20
C3: 9 points 1469.9 km/sec @ PA 265.84
Average through both(C2/C3) fields: 1498.4 km/sec
Acceleration: -38.13 m/sec^2
COMMENT:
LASCO C2/C3 shows a frontside-directed partial halo in the south-west
direction. NOAA reports a C7.6 class flare in AR 3939 [S19W58] starting
@ 18:27 UTC. SolarSoft details that the flare appears to be associated
with a
pair of LDEs in the south west quadrant in
active regions 13939
along with an AR 13941 connection post-eruption arcades can be seen
in GOES-16 SUVI 171 angstroms along the west limb.
GOES-P Proton Flux shows a rapid augmentation of proton flux @ 20:15
UTC, exceeding 10 proton flux units @ 22:15 UTC. The proton flux peaks
at 20 pfu @ 00:55 UTC on January 5th.
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/2025/250104/
Best Regards,
--Taylor Lanier
BT
[Images from original message are omitted here]
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