:Product: 0517SGAS.txt :Issued: 2026 May 17 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 137 Issued at 0245Z on 17 May 2026 This report is compiled from data received at SWO on 16 May A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0032 0032 0032 140 1038 1038 1038 150 1550 1612 1622 4436 N20W16 M1.9 2n 500 170 IV 1605 1847 IV 1622 1629 1634 4436 M1.3 1739 1742 1744 4435 M1.9 2313 2330 2338 4435 C5.8 140 B. Proton Events: None C. Geomagnetic Activity Summary: Geomagnetic activity was at quiet to G2 (Moderate) levels. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 109 SSN 083 Afr/Ap 019/034 X-ray Background B4.1 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 5.3e+06 GT 10 MeV 1.8e+04 p/(cm2-ster-day) (GOES-19 satellite synchronous orbit W72 degrees) Daily Electron Fluence GT 2 MeV 4.50e+07 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W72 degrees) 3 Hour K-indices: Boulder 5 5 5 3 2 3 3 3 Planetary 6 5 5 4 2 5 4 3 F. Comments: None