磁化电离层等离子体异常吸收效应研究  

Anomalous absorption effect on magnetized plasma induced by ionospheric modification

作　　者：满莉[1] 马广林[1] 车海琴[1] MAN Li;MA Guanglin;CHE Haiqin(National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China)

机构地区：[1]中国电波传播研究所电波环境特性及模化技术重点实验室,青岛266107

出　　处：《电波科学学报》2017年第4期434-440,共7页Chinese Journal of Radio Science

基　　金：中国电科技术创新基金(KJ1602004)

摘　　要：研究了电离层加热中的异常吸收效应.采用动力学理论,从弗拉索夫方程出发,结合磁化等离子体中电波色散关系与地磁场中泵波电场作用于电子与离子形成的位移电流,详细推导了加热形成的沿磁场分布电子密度不均匀体扰动所引起的电波幅度异常吸收系数.利用异常吸收系数解析表达式模拟计算了吸收系数随地磁倾角的变化,结果表明:随着地磁倾角的增加,异常吸收系数增大,在地磁倾角约70°以后缓慢下降;在考虑了地磁场对高频电导率影响后,异常吸收系数降低,而且地磁倾角越大系数下降越明显.The amplitude anomalous absorption of an O-mode low-power diagnostic radio wave passing through the perturbed region in ionospheric modification is investigated. Kinetic theory and Vlasov equation describing electron dynamics are employed to derive the coefficient of anomalous absorption caused by artificial field-aligned irregularities, considering effects of a magnetic field on the dispersion relationship of EM waves and on motions of electrons in calculations of the displacement current density. With analytical expressions, variations of the anomalous absorption coefficient with the geomagnetic dip are calculated. It is shown that the coefficient increases with the geomagnetic dip until 70°, and then drops off slowly. With consideration of the geomagnetic field when calculating the HF conductivity, the coefficient is decreased and more obvious at high geomagnetic dip.

关 键 词：电离层加热 异常吸收系数 磁化等离子体 动力学理论 地磁倾角 

分 类 号：P352.3[天文地球—空间物理学]