Proton Flux

Updates: Every 5 minutes

(last updated 21 May 2025 09:25 UT)

GOES (Gp18) satellite energetic Proton Flux (Courtesy of SWPC, Boulder Colorado, USA) Proton event detection will lag data time by approximately 1 hour due to data smoothing. Data Date/Time: 21 05 2025 0915 UT Proton Energy Current Proton Level Flux Event Status 10MeV 1.83e-01PFU No proton event in progress 100MeV 1.71e-01PFU No proton event in progress 500MeV 1.65e-01PFU No proton event in progress Units: PFU = protons/cm2/sec/ster MeV = million electron volts Proton energy levels and PFU event thresholds: Proton Energy Proton Flux Level Threshold 10MeV 10PFU 100MeV 1PFU 500MeV 1PFU Gp: GOES primary Gs: GOES secondary Solar proton events can impact satellite operations and transpolar HF communications.

GOES satellite proton flux data are provided by US Space Weather Prediction Center in Boulder.