:Product: 0521SGAS.txt :Issued: 2025 May 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 141 Issued at 0245Z on 21 May 2025 This report is compiled from data received at SWO on 20 May A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0000 0000 0000 200 2239 2247 2251 4093 C1.6 140 190 B. Proton Events: None. C. Geomagnetic Activity Summary: The geomagnetic field was quiet to unsettled. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 119 SSN 067 Afr/Ap 012/013 X-ray Background B5.3 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 6.4e+05 GT 10 MeV 1.6e+04 p/(cm2-ster-day) (GOES-18 satellite synchronous orbit W137 degrees) Daily Electron Fluence GT 2 MeV 3.80e+07 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 2 3 4 4 3 3 2 3 Planetary 2 3 3 3 3 3 2 3 F. Comments: None.