:Product: 1218SGAS.txt :Issued: 2025 Dec 18 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 352 Issued at 0245Z on 18 Dec 2025 This report is compiled from data received at SWO on 17 Dec A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0227 0227 0227 120 B. Proton Events: None. C. Geomagnetic Activity Summary: The geomagnetic field reached G1 (Minor) storming levels. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 119 SSN 068 Afr/Ap 010/018 X-ray Background B6.4 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 8.4e+05 GT 10 MeV 1.4e+04 p/(cm2-ster-day) (GOES-18 satellite synchronous orbit W137 degrees) Daily Electron Fluence GT 2 MeV 4.00e+07 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 2 3 3 3 2 3 3 4 Planetary 3 3 3 2 3 3 4 5 F. Comments: None