:Product: 20011223SGAS.txt :Issued: 2001 Dec 23 0245 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Environment Center and the U.S. Air Force. # Joint USAF/NOAA Solar and Geophysical Activity Summary SGAS Number 357 Issued at 0245Z on 23 Dec 2001 This report is compiled from data received at SWO on 22 Dec A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep None B. Proton Events: None C. Geomagnetic Activity Summary: The geomagnetic field was at quiet to unsettled levels. D. Stratwarm: STRATWARM ALERT EXISTS STRATWARM SATURDAY STRONG STRATOSPHERIC WARMING IN THE MIDDLE AND UPPER STRATOSPHERE, FURTHER INTENSIFYING. REVERSED TEMPERATURE GRADIENT BETWEEN 60N AND THE NORTH POLE EXPECTED WITHIN THE NEXT 3 DAYS FROM THE UPPER STRATOSPHERE DOWN TO 30 HPA. E. Daily Indices: (real-time preliminary/estimated values) 10 cm 243 SSN 234 Afr/Ap 008/008 X-ray Background C1.2 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 2.1e+05 GT 10 MeV 1.3e+04 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 3.40e+05 e/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 2 2 3 3 2 1 2 2 Planetary 2 2 3 3 2 2 2 1 F. Comments: Afr is based on Boulder A-indices