SOHO/LASCO Halo CME 20251114

Halo Alert: halo-message.20251114

UCMEO 93001 51114 1755/
51114 60800 80948 2951/ 295// 323// 41217
51114 60744 80830 42158 14274 1112/
99999

PLAIN

SOHO/LASCO HALO CME November 14, 2025

C2 Start Time: 08:00 UT

C3 Start Time: 08:30 – 11:42 UT

Type of CME:
Asymmetric HALO CME — FRONTSIDE
pa1: 295 pa2: 295 Total Width: 360 degrees

Velocity Measurements:

C2 2 points 950.8 km/sec @ PA 295
C3 5 points 1097 km/sec @ PA 295
Average through both fields: 1217.8 km/sec Acceleration: -23.96 m/sec^2.

COMMENT: A frontside, full HALO event can be seen in LASCO C2/C3 in the Northwest
direction starting @ 08:00 UT. According to NOAA, the CME is associated with a X4.0 eruptive solar flare in AR 14274 [N21,W58]. The solar flare can best be viewed in GOES-19 SUVI Composite 131 Angstroms and 94 Angstroms where EUV waves can also be seen near the Northwest limb.

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/2025/251114/

Best Regards,

--Taylor Lanier

[Images from the original alert message are omitted here]

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SOHO/LASCO C2 Diff	SOHO/LASCO C3 Diff	SDO AIA 195 angstrom

GOES-19 CCOR1	SDO AIA 195 angstrom Diff	STEREO/COR2 AHEAD Diff

SOHO/LASCO C2	SOHO/LASCO C3	GOES-19 SUVI 195A