电离层等离子体漂移的振荡

根据中纬Ｗａｋｋａｎａｉ站与低纬Ｏｋｉｎａｗａ站的垂测数据，得出电离层峰区垂直漂移的频谱结构．结果表明，漂移除具有周期在２４ｈ之内的潮汐分量外，低纬站还呈现出值得特别注意的２．１ｄ的周期振荡．作者认为，低纬垂直漂移的振荡行为，主要是电场的波动分量引起；这种波动电场包含潮汐振荡与行星波两日振荡的成分．峰值电子浓度的振荡最直接地是由中性大气温度控制；而峰高的波动起伏，则主要是电场振荡的结果．

OSCILLATIONS OF PLASMA DRIFTS IN IONOSPHERE

The spectral structures of the vertical drifts at the F2 peak are obtained, by using the ionospheric data of a mid-latitude station WAKKANAI and a lower midlatitude one OKINAWA, with the help of the SERVO model. The results indicate that there exist 6 hours, 8 hours and 24 hours tidal componements in the vertical drifts due to the neutral wind and the electric field, especially, the 2-day wave is clearly present at OKINAWA. It is concluded, that the oscillations at the lower mid-latitude are mainly contributed to the fluctuations of the E-field, in which tidal and 2-day planetary waves are included. As for f0F2 and hmF2, the major parameters of the ionospheric F2-layer,it is suggested that the oscillations of the maximum density may be directly related to the neutral temperature variations, while those of the peak height may result from the electric field fluctuations.