赤道地区和中纬度地区扩展F的特点和比较  

THE CHARACTERISTICS AND RELATIONSHIPS OF EQUATORIAL AND MID-LATITUDE SPREAD-F

作　　者：张天华[1] 萧佐[1] 

机构地区：[1]北京大学地球物理系,100871

出　　处：《空间科学学报》2000年第3期224-232,共9页Chinese Journal of Space Science

基　　金：国家自然科学基金!49874041;49990454

摘　　要：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，发现在适合的电高层参数组合下会产生观测到的电高层F区顶部挑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．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.

关 键 词：扩展F 声重波 赤道地区 中纬度地区 地球 

分 类 号：P318[天文地球—固体地球物理学]