Studies of the E-Region Neutral Wind in the Auroral Ionosphere Using Two Long-Run Data

摘要: EISCAT data obtained in the auroral ionosphere have been analyzed terms of E-region neutral wind behavior at three heights 101, 109, and 119 km. We two extended CP-1-H runs conducted over four consecutive days each for 21-25 September 1987 16-20 March 1988. Mean winds as well tidal amplitudes phases derived by both Fast Fourier Transform (FFT) least square fit (LSF) methods are compared with those corresponding seasonal from quiet-time statistical study Brekke et al. (1994). During mean zonal FFT filling zeroes gaps blows eastward a maximum ∼20 m s-1 between 101 km its direction is consistent average fall wind. The directions meridional vertical winds, however, opposite to reasonable agreement found. quiet time. At shows large enhancement during very geomagnetically disturbed period 16 UT on 22 05 23 also about 5 hours after end period. 1988 small while less than 18 km, which half that spring Most diurnal semidiurnal horizontal found height profiles most components much same Comparisons made results Sondre Stromfjord IS radar model predictions, geomagnetic disturbance effects discussed.