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 上行离子密度分布特性的理论研究 Alternative Title A THEORETICAL STUDY ON THE FEATURES OF DENSITY DISTRIBUTION OF UP-FLOWING IONS IN THE MAGNETOSPHERE 史建魁; 刘振兴; 北京8701信箱 Department 空间天气学国家重点实验室 Source Publication 地球物理学报 1996 Volume 39Issue:2Pages:159-168 ISSN 0001-5733 Language 中文 Keyword 磁层 上行离子 密度分布 Abstract 采用动力学方程，求解了定态情况下磁层中上行离子沿磁力线的分布函数，针对不同的Ｋｐ指数，分别对北半球极光带区起源的上行离子Ｏ＋、Ｈ＋和Ｈｅ＋在子午面内沿磁力线的密度分布及其特性进行了研究．结果表明：１．沿磁力线向外，上行离子密度在近地空间呈急剧下降趋势，在远地空间呈缓慢下降趋势；２．重离子或初始能量较小的离子，其密度沿磁力线向外下降较快；３．Ｋｐ指数越大，离子进入磁层的空间范围越大；４．离子的投掷角分布对密度分布的影响甚小；５．离子密度沿磁力线的下降程度随到Ｘ轴距离的增大而呈增大趋势；６．在典型参数条件下，求得上行离子Ｏ＋在等离子体片边界附近的密度为１０－３－１０－２个ｃｍ－３，这与观测结果相一致． Other Abstract Based on the dynamic equation, the static density distribution function of upflowing ions along the magnetic line is found and some features of the distribution for H+, O+, and He+ ions originating in the auroral zone are studied. The results show that: 1. the ion densities along the magnetic line reduce quickly in near geo-space and slowly in far geo-space; 2. the more the ion mass or the less the initial energy is, the more quickly the ion density reduces along the magnetic line; 3.the more the distance to the GSM X axis is, the more quickly the ion density reduces along the magnet c line; 4. when Kp=3-5, the up-flowing ions will exist in larger space than that when Kp = 0.5. the density distribution is hardly affected byion pitch angle. Some results are consistent with the observation. Funding Project 中国科学院空间科学与应用研究中心 Document Type 期刊论文 Identifier http://ir.nssc.ac.cn/handle/122/1238 Collection 空间科学部 Corresponding Author 北京8701信箱 Recommended CitationGB/T 7714 史建魁,刘振兴,北京8701信箱. 上行离子密度分布特性的理论研究[J]. 地球物理学报,1996,39(2):159-168. APA 史建魁,刘振兴,&北京8701信箱.(1996).上行离子密度分布特性的理论研究.地球物理学报,39(2),159-168. MLA 史建魁,et al."上行离子密度分布特性的理论研究".地球物理学报 39.2(1996):159-168.