:Product: 0518SGAS.txt :Issued: 2026 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 2026 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 0329 0339 0342 4435 M1.4 0559 0559 0559 150 2042 2053 2105 4436 C9.7 150 370 B. Proton Events: None. C. Geomagnetic Activity Summary: The geomagnetic field was quiet. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 104 SSN 086 Afr/Ap 007/008 X-ray Background B4.7 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 4.4e+06 GT 10 MeV 2.1e+04 p/(cm2-ster-day) (GOES-19 satellite synchronous orbit W72 degrees) Daily Electron Fluence GT 2 MeV 2.90e+08 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W72 degrees) 3 Hour K-indices: Boulder 2 3 2 3 2 2 2 2 Planetary 2 2 2 2 2 2 2 2 F. Comments: None