By numerical simulations the characteristicsof the mechanism of equatorial and mid-latitude Spread-F and relationsbetween them are studied. It isfound that in different latitudes, the same mechanism can evolve intoquite different structures as the background ionosphere is different.Then a theory to explain the discord of disturbance phasesin bottomside and topside ionosphere, because it is believed that throughsome combinations of ionospheric parameters, bubbles can generate intopside first without much disturbance of the bottomside ionosphere. Andby numerical simulation. A model of radio-wave scattering is put forward toexplain the higher occurrence rate of the blur of radio waves inmid-latitudes than what is expected by linear theory.%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,发现在适合的电离层参数组合下会产生观测到的电离层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.
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