极区中层顶区域尘埃粒子对电磁波散射的研究  

Scattering of electromagnetic wave by charged dust in polar mesopause

作　　者：李海龙[1] 吴健[2] 黄际英[1] 王茂琰[2] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071 [2]中国电波传播研究所,电波环境特性及模化技术国家重点实验室,北京102206

出　　处：《电波科学学报》2008年第4期686-688,共3页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目(No.40310223);电波环境特性及模化技术国家重点实验室基金资助

摘　　要：极区中层顶区域存在大量带电冰晶微粒,属于尘埃等离子体范畴。在此区域由于尘埃微粒的存在将引起电子密度的不规则性变化,产生异常强大的雷达回波,即极区中层夏季回波。从尘埃等离子体理论出发,应用尘埃等离子体的微分散射截面从理论上解释发生极区中层夏季回波时的雷达单位体积后向散射截面与工作频率的内在联系。结果表明:理论计算结果与实验统计结果一致。Polar Mesosphere Summer Echoes（PMSE）are very strong radar echoes near the polar mesopause at local summer. A mass of charged dust particles exist in the mesopause of the Earth, the differential scattering cross section is used to explain strong echoes with the theory of dusty plasma. Comparing the relations published in other paper between the backscattering cross section per unit volume and work frequency, the differential scattering cross section is consist with the backscattering cross section per unit volume, which show the results calculated in dusty plasma is consist with experimentally statistical results.

关 键 词：极区中层夏季回波 微分散射截面 尘埃粒子 

分 类 号：TN011[电子电信—物理电子学]