Abstract
In this work we have made a comparison between quiet and disturbed time values of the auroral zone E-field ionospheric conductances and E-region neutral winds as derived from EISCAT-UHF measurements. The average diurnal mean values of the E-field are rather unchanged between quiet and disturbed days while the amplitude of the 24-hour diurnal oscillation is enhanced by a factor of 3 from averaged quiet to disturbed days. The E-region neutral wind has an eastward component between 90 and 110 km which is seasonal dependent, showing highest values in summer and lowest in winter with spring and fall values in between. The most outstanding difference between quiet and disturbed time E-region neutral winds is an increase in the eastward diurnal fide of a factor of 3-4 above 100 km. The mean wind as well as the higher order tidal modes (12-, 8- and 6-hour modes) display rather minor differences.
