UCMEO 93001 51105
2130/
51104 61736 81948 0341/ 034// 323// 40949
51104 61715 81734 12362 14274 1112/
99999
PLAIN
SOHO/LASCO HALO CME November 04, 2025
C2 Start Time: 17:36 UT
C3 Start Time: 17:54 – 20:30 UT
Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 34 pa2:
34 Total Width: 360 degrees
Velocity Measurements:
C2 5 points 874.6 km/sec @ PA 34
C3 6 points 810.2 km/sec @ PA 34
Average through both fields: 949.8 km/sec Acceleration:
-49.82 m/sec^2.
COMMENT: A frontside, full HALO event can be seen in LASCO C2/C3 in the
Northeast
quadrant starting @ 17:36 UT. COR2-A shows this CME in the Northeast
quadrant beginning
@ 17:38 UT. NOAA reports an X1.8 solar flare in AR 14274 [N23E62] that
commences
@ 17:15 UT, peaking @ 17:34 UT. Opening lines are visible in SDO/AIA
193/171 @ 17:18 UT where the X1.8 solar flare at its peak can be seen @
17:36 along with EUV wave propagation, followed by emerging
post-eruption arcades.
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/2025/251104/
Best Regards,
--Taylor Lanier
BT
[Images from original message are omitted here]
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