中低纬F区E×B不稳定性的线性研究

中低纬F区E×B不稳定性的线性研究 LINEAR STUDY OF E×B DRIFT INSTABILITY IN THE F-REGION AT MID AND LOW LATITUDE 雷源汉 Lei Yuahan 1 2 first-author 金延 Jin Yan 1 2 朱崇灿 Zhu Chongcan 1 2 叶冬英 Ye Dongying 1 2 武汉大学电子信息学学院,武汉,430072 武汉大学电子信息学学院,武汉,430072 College of Electronic Information, Wuhan University College of Electronic Information, Wuhan University 华中电力调度通讯局,武汉,430077 华中电力调度通讯局,武汉,430077 建立了一适合于考察中低纬电离层F区宏观不稳定性的空间坐标系。由连续性方程和动量方程,导出了包括重力项、E（电场）×B（磁场）项及水平中性风项在内的线性增长率表达式．选取IRI-90模式为电子密度分布模型,对不同纬度、不同季节的不稳定性出现情况进行了计算．结果表明:不稳定性线性增长率随纬度的增加而变小;在相同条件下,冬季的增长率一般小于夏季的;在中纬Rayleigh-Taylor模难于生长,这与中纬闪烁事件某些观测特征一致。 The space coordinate is established which are used to describe the macroscopic instability in the ionospheric F region at mid and low latitude. The expression of linear growth rate the continuty and the momentum equations. The electron density distribution is used in calculate which is obtained by IRI-90 model. The instability growth rate is calculated for different latitudes, different seasons. The instability growth rate becomes smaller as the latitude increase, the growth rate of winter less than that of summer in same conditions. It is hard for a pure R-T mode to grow in midlatitude. This is in agreement with some observational characteristics of midlatitude scintillation event. F区 不稳定性 增长率 F region instability growth rate P352.3 国家自然科学基金资助的课题 1996-03-01 2021-04-01 3