:Product: 0928SGAS.txt :Issued: 2017 Sep 28 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 271 Issued at 0245Z on 28 Sep 2017 This report is compiled from data received at SWO on 27 Sep A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 1210 1210 1210 130 1249 1249 1249 100 B. Proton Events: None C. Geomagnetic Activity Summary: The geomagnetic field reached major storm levels in the 27/18-21Z synoptic period due to CIR and positive polarity CH HSS influences. Minor levels were observed the final synoptic periods of the day. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 091 SSN 035 Afr/Ap 024/037 X-ray Background A8.1 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 2.9e+06 GT 10 MeV 1.4e+04 p/(cm2-ster-day) (GOES-13 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 1.90e+06 e/(cm2-ster-day) (GOES-13 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 3 2 4 4 3 3 5 4 Planetary 3 2 4 4 4 4 7 5 F. Comments: None