:Product: 0818SGAS.txt :Issued: 2024 Aug 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 231 Issued at 0245Z on 18 Aug 2024 This report is compiled from data received at SWO on 17 Aug A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0710 0713 0725 3790 S11E54 Sf 270 0732 0732 0733 1000 0757 0757 0757 100 1024 1033 1042 3784 N17W42 M1.6 1n 1122 1144 1156 3785 S16W23 M1.1 Sf 1757 1757 1757 270 2137 2148 2157 3790 S09E47 M1.1 1f 2157 2206 2214 3790 M1.4 B. Proton Events: None. C. Geomagnetic Activity Summary: The geomagnetic field reached severe storm levels in response to the arrival of a CME that left the Sun on 14 Aug. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 230 SSN 170 Afr/Ap 024/047 X-ray Background C3.1 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 3.2e+05 GT 10 MeV 1.7e+04 p/(cm2-ster-day) (GOES-18 satellite synchronous orbit W137 degrees) Daily Electron Fluence GT 2 MeV 3.00e+06 e/(cm2-ster-day) (GOES-16 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 1 0 2 3 4 6 4 5 Planetary 1 1 1 2 3 8 6 6 F. Comments: None.