赤道地区和中纬度地区扩展F的特点和比较

通过数值模拟研究了赤道地区和中纬度地区扩展Ｆ的触发机制间的联系，发现相同的触发机制在不同纬度的条件下所演化出的结构形态不相同，因此观测上会有所不同；研究了西向电场在赤道地区的作用，发现在适合的电脑层参数组合下会产生观测到的电脑层Ｆ区顶部扰动出现率高于底部扰动出现率的状况；在数值模拟的基础上提出了一个中纬度地区电波散射的模型，用以解释观测到的中纬度地区电波散射的出现率高于线性理论预期的现象。

THE CHARACTERISTICS AND RELATIONSHIPS OF EQUATORIAL AND MID-LATITUDESPREAD-F

By numerical simulations the characteristics of the mechanism of equatorial andmid-latitude Spread-F and relations between them are studied. It is found that indifferent latitudes, the same mechanism can evolve into quite different structuresas the background ionosphere is different. Then a theory to explain the discordof disturbance phases in bottomside and topside ionosphere, because it is believedthat through some combinations of ionospheric parameters, bubbles can generatein topside first without much disturbance of the bottomside ionosphere. And bynumerical simulation. A model of radio-wave scattering is put forward to explainthe higher occurrence rate of the blur of radio waves in mid-latitudes than what isexpected by linear theory.