:Product: 20001213SGAS.txt :Issued: 2000 Dec 13 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 348 Issued at 0245Z on 13 Dec 2000 This report is compiled from data received at SWO on 12 Dec A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 1437 1507 1523 9267 N08E25 M1.3 1f 78 B. Proton Events: None C. Geomagnetic Activity Summary: The geomagnetic field was predominantly quiet throughout the day. A single unsettled period was observed at Boulder during 1500-1800 UTC. The greater-than-2 MeV electron flux at geosynchronous orbit was elevated at moderate levels (above 1000 pfu) during local daytime hours. D. Stratwarm: STRATWARM ALERT/TUESDAY/STRATWARM EXISTS. MAJOR WARMING CONTINUES. 5 AND 8-DAY FORECASTS INDICATE A VORTEX SPLITTING EVENT TO FORM TWO NEW CENTRES OVER THE CANADIAN ARCTIC AND A WEAKER CENTRE OVER SIBERIA. THE WARM AIR OVER SIBERIA AND RUSSIA COOLS SLIGHTLY AND SPREADS TO THE WEST. E. Daily Indices: (real-time preliminary/estimated values) 10 cm 150 SSN 095 Afr/Ap 003/005 X-ray Background B6.4 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 1.4e+05 GT 10 MeV 1.0e+04 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 8.90e+07 e/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 1 1 1 2 2 3 2 1 Planetary 1 1 1 2 2 2 2 1 F. Comments: None