:Product: 0421SGAS.txt :Issued: 2026 Apr 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 111 Issued at 0245Z on 21 Apr 2026 This report is compiled from data received at SWO on 20 Apr A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0100 0100 0100 100 0101 0101 0101 100 0204 0204 0204 300 0237 0237 0237 100 0514 0514 0514 100 0721 0721 0721 110 0732 0732 0732 150 0833 0845 0852 4419 N16W11 C1.0 Sf 210 0947 0947 0948 100 1458 1514 1525 C1.6 120 B. Proton Events: None C. Geomagnetic Activity Summary: The geomagnetic activity reached Minor storm levels. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 105 SSN 046 Afr/Ap 013/024 X-ray Background B3.4 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 1.3e+06 GT 10 MeV 1.8e+04 p/(cm2-ster-day) (GOES-18 satellite synchronous orbit W137 degrees) Daily Electron Fluence GT 2 MeV 3.70e+07 e/(cm2-ster-day) (GOES-19 satellite synchronous orbit W72 degrees) 3 Hour K-indices: Boulder 1 2 4 4 3 4 3 4 Planetary 1 2 4 4 3 5 5 4 F. Comments: None