:Product: 1221SGAS.txt :Issued: 2025 Dec 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 355 Issued at 0245Z on 21 Dec 2025 This report is compiled from data received at SWO on 20 Dec A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0736 0753 0806 4315 N19E58 M1.0 Sf II B. Proton Events: None C. Geomagnetic Activity Summary: The geomagnetic activity was at quiet to unsettled levels. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 120 SSN 074 Afr/Ap 004/006 X-ray Background B6.5 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 2.5e+06 GT 10 MeV 1.5e+04 p/(cm2-ster-day) (GOES-18 satellite synchronous orbit W137 degrees) Daily Electron Fluence GT 2 MeV 2.30e+08 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 1 1 1 2 2 2 2 2 Planetary 2 1 1 1 2 2 2 3 F. Comments: None