:Product: 0915SGAS.txt :Issued: 2017 Sep 15 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 258 Issued at 0245Z on 15 Sep 2017 This report is compiled from data received at SWO on 14 Sep A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0057 0057 0057 130 B. Proton Events: The greater than 10 MeV proton flux continued a steady decline from S1 (Minor radiation storm) levels, with a maximum flux of 77 pfu at 14/0120 UTC and ended the period below the S1 level. The greater than than 100 MeV proton flux returned to background levels. C. Geomagnetic Activity Summary: The geomagnetic field was quiet until the 12-15 UTC synoptic period, when the CIR and CH HSS caused an overall response to active levels, followed by minor and moderate geomagnetic storming conditions during the 15-18 UTC synoptic period. The escalation of activity was likely due to the the prolonged period of negative Bz during CIR passage and CH HSS onset. D. Stratwarm: Not Available E. Daily Indices: (real-time preliminary/estimated values) 10 cm 074 SSN 011 Afr/Ap 019/027 X-ray Background