Photoelectron flux buildup in the plasmasphere
Photoelectron flux buildup in the plasmasphere
复制标题
等离子层中光电子通量的积累
DOI：
10.1029/ja083ia01p00001
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发表时间：
1978
影响因子：
--
通讯作者：
V. Wickwar
中科院分区：
文献类型：
--
作者：
G. P. Mantas;H. Carlson;V. Wickwar
将光电子限制在等离子体层的过程(例如，来自热层的碰撞后向散射和由于等离子体层中库仑碰撞的俯仰角重新分布而引起的磁捕获)往往会使等离子体层中的稳态光电子通量增加到原本会达到的幅度水平以上。给出了特定大气和电离层条件下等离子体层稳态光电子通量的理论计算。(这些条件下的观测等离子体线强度数据已经存在，并将在其他地方进行比较。)给出了角分布的一般特征，并与观测结果进行了比较。研究了等离子体层的透明度和热层的后向散射特性。计算了单碰撞后向散射的累积效应，并估算了俯仰角扩散和后向散射的联合累积效应。结果表明，这些效应的加入使等离子体层中的稳态光电子通量幅值比不考虑增强效应时提高了约50%。计算的等离子体层稳态光电子通量与已有的观测结果符合得很好。
Processes which confine photoelectrons to the plasmasphere (e.g., collisional backscattering from the thermosphere and magnetic trapping due to pitch angle redistribution through Coulomb collisions in the plasmasphere) tend to increase the steady state photoelectron flux in the plasmasphere above the amplitude level that would otherwise have been attained. Theoretical calculations are presented of steady state photoelectron fluxes in the plasmasphere, for specified atmospheric and ionospheric conditions. (Observational plasma line intensity data for these conditions exist and will be compared elsewhere.) General features of the angular distribution are presented and compared with observations. The transparency of the plasmasphere and the backscattering properties of the thermosphere are investigated. The buildup effect due to collisional backscatter alone is calculated, and the combined buildup effect of pitch angle diffusion and backscatter is estimated. It is found that the inclusion of these effects increases the steady state photoelectron flux amplitude in the plasmasphere by about 50% over the value obtained when the buildup effects are neglected. The calculated steady state photoelectron fluxes in the plasmasphere are in good agreement with the available observations.