对两种弱电离尘埃等离子体特征参量的定量估计  

Characteristic parameters estimation of two weakly ionized dusty plasma

作　　者：石雁祥[1] 王菊[1,2] 吴健[2] 葛德彪[1] 吴军[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,电波环境特性与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1期95-99,共5页Chinese Journal of Radio Science

基　　金：电波环境特性与模化技术国家重点实验室基金项目(编号:51486040205DZ0101编号:9140C080501060C08);国家自然科学基金重大国际合作项目(资助号40310223)

摘　　要：对火箭喷焰和地球极区中层大气尘埃等离子体的特征参量做了定量估计和分析。研究表明,两种尘埃等离子体中分子的浓度远大于电子和离子的浓度,电子、离子与分子的碰撞频率大于相应带电粒子的等离子体频率,其尘埃粒子之间的库仑耦合参数远小于1,因而它们均为弱电离、弱耦合的尘埃等离子体。火箭喷焰中的尘埃粒子间距大于其德拜半径,而极区中层大气中的尘埃粒子间距远小于其德拜半径。这意味着火箭喷焰中的尘埃粒子是孤立的,而极区中层大气中的尘埃粒子是非孤立的。The characteristic parameters for dusty plasmas of rocket exhaust plume and polar mesosphere are estimated and analyzed based on their practical data. It is found that the concentration of molecules in these two dusty plasmas is much larger than that of electrons and ions, the collision frequencies between electron-molecules and ion-molecules are much larger than their plasma frequencies, respectively, the Coulomb coupling parameters between dust particles are always much less than one. Therefore these two kinds of dusty plasmas are both weakly ionized and weakly coupling. Furthermore the distance between dust particles in rocket exhaust plume is larger than its Debye length, a dust particle in it is thus isolated from each other. However, a dust particle in polar mesosphere is non-isolated, because the dust particle distance in it is much less than its Debye length.

关 键 词：尘埃等离子体 火箭喷焰 极区中层大气 特征参量 

分 类 号：TN01[电子电信—物理电子学] O539[理学—等离子体物理]