:Product: 0121SGAS.txt :Issued: 2026 Jan 21 0245 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Weather Prediction Center and the U.S. Air Force. # Joint USAF/NOAA Solar and Geophysical Activity Summary SGAS Number 021 Issued at 0245Z on 21 Jan 2026 This report is compiled from data received at SWO on 20 Jan A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0119 0119 0119 100 0741 0741 0741 100 0749 0751 0751 120 0749 0749 0749 100 0759 0759 0759 480 1442 1442 1442 110 B. Proton Events: Proton event progressed throughout the period. GOES-18 >10 MeV flux of 37,000 pfu at 1915Z and >100 MeV flux of 0.545 pfu at 0735 at 1140Z. C. Geomagnetic Activity Summary: The geomagnetic field reached severe (Kp=8) levels. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 178 SSN 172 Afr/Ap 091/143 X-ray Background C1.2 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 1.8e+08 GT 10 MeV 8.4e+06 p/(cm2-ster-day) (GOES-18 satellite synchronous orbit W137 degrees) Daily Electron Fluence GT 2 MeV 1.20e+07 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 7 5 7 8 7 5 5 6 Planetary 6 6 8 8 7 7 7 8 F. Comments: None