:Product: 19980223SGAS.txt :Issued: 1998 Feb 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 054 ISSUED AT 0245Z ON 23 FEB 1998 THIS REPORT IS COMPILED FROM DATA RECEIVED AT SWO ON 22 FEB 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 QUIET AT ALL LATITUDES. D. STRATWARM: STRATWARM ALERT/SUNDAY/STRATWARM EXISTS. THE INTENSE WARMING CONTINUOUSLY COVERS SIBERIA,THE POLAR REGION, ALASKA, NORTH CANADA AND GREENLAND AT 10HPA,SLOWLY WEAKENING. TEMPERATURE GRADIENT REVERSED BETWEEN 60N AND THE POLE FROM 30HPA UPWARDS INTO THE UPPER STRATOSPHERE. E. DAILY INDICES: 10 CM 096 SSN 038 AFR/AP 004/006 X-RAY BACKGROUND A8.6 DAILY PROTON FLUENCE (FLUX ACCUMULATION OVER 24 HRS) GT 1 MEV 5.2E+05 GT 10 MEV 1.7E+04 P/(CM2-STER-DAY) GOES-9 SATELLITE SYNCHRONOUS ORBIT W135 DEGREES) DAILY ELECTRON FLUENCE GT 2 MEV 4.30E+07 E/(CM2-STER-DAY) GOES-9 SATELLITE SYNCHRONOUS ORBIT W135 DEGREES) 3 HOUR K-INDICES: BOULDER 1 1 1 2 1 2 2 1 PLANETARY 1 2 1 3 2 2 2 0 F. COMMENTS: NONE.