:Product: 0518SGAS.txt :Issued: 2025 May 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 138 Issued at 0245Z on 18 May 2025 This report is compiled from data received at SWO on 17 May A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0956 1009 1019 4089 B8.5 170 B. Proton Events: None. C. Geomagnetic Activity Summary: The geomagnetic field reached major storm levels during the onset of a postive polarity coronal hole with possible embedded transient. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 117 SSN 058 Afr/Ap 025/??? X-ray Background B4.0 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 1.2e+06 GT 10 MeV 1.5e+04 p/(cm2-ster-day) (GOES-18 satellite synchronous orbit W137 degrees) Daily Electron Fluence GT 2 MeV 1.10e+07 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 5 5 4 5 5 5 3 2 Planetary 6 5 3 5 4 4 4 3 F. Comments: None.