563
WOXX32 KWNP 120201
ALTPX3

Space Weather Message Code: ALTPX3
Serial Number: 33
Issue Time: 2025 Nov 12 0155 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 1000pfu
Begin Time: 2025 Nov 12 0145 UTC
NOAA Scale: S3 - Strong
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience increasing radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to elevated radiation levels.
Spacecraft - Single-event upsets to satellite operations, noise in imaging systems, and slight reduction of efficiency in solar panels are likely.
Radio - Degraded or episodically blacked-out polar HF (high frequency) radio propagation.

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