左旋寻常的极光千米波与辐射带高能电子相互作用的参数化研究  

Parametric Study on Interaction between Superluminous L-O Mode Waves and Radiation Belt Electrons

作　　者：李文涛 张赛[1,2,4] 贺佳贝 邓舟坤 杨奇武 商雄军 周庆华 LI Wentao;ZHANG Sai;HE Jiabei;DENG Zhoukun;YANG Qiwu;SHANG Xiongjun;ZHOU Qinghua(School of Physics and Electronic Sciences,Changsha University of Science and Technology,Changsha 410114;State Key Laboratory of Space Weather,Chinese Academy of Sciences,Beijing 100190;Tencent Cloud Computing(Changsha)Company Limited,Changsha 410221;Hunan Province Higher Education Key Laboratory of Modeling and Monitoring on the Near-Earth Electromagnetic Environments,Changsha 410114)

机构地区：[1]长沙理工大学物理与电子科学学院,长沙410114 [2]中国科学院空间天气学国家重点实验室,北京100190 [3]腾讯云计算(长沙)有限责任公司,长沙410221 [4]湖南省普通高校重点实验室近地空间电磁环境监测与建模实验室,长沙410114

出　　处：《空间科学学报》2022年第6期1079-1088,共10页Chinese Journal of Space Science

基　　金：国家自然科学基金项目(42074198,42004141);空间天气学国家重点实验室项目(202014)共同资助。

摘　　要：参数化研究了在L=4.5外辐射带区域左旋寻常(Left-hand Ordinary mode,L-O模)的极光千米波与高能电子的相互作用,定量计算了左旋寻常的极光千米波在不同峰值频率、传播角分布和纬度分布条件下的弹跳平均投掷角扩散系数、动量扩散系数和投掷角–动量交叉扩散系数。计算结果表明,动量扩散系数一般比投掷角扩散系数大100倍左右,说明动量扩散在L-O模与电子间的相互作用中起主导作用。随着传播角范围的改变,扩散系数均未发生明显变化,这说明L-O模与电子相互作用的扩散系数对传播角范围的依赖性很小。此外,扩散系数会因为L-O模纬度分布的改变而发生剧烈变化,该结果与之前得到的纬度分布对右旋奇异的极光千米波的影响是一致的。通过参数化研究结果表明,适当条件下,L-O模可能会显著影响外辐射带高能电子的动力学过程。The parametric study focuses on the interaction between the superluminous Left-hand Ordinary(L-O)mode waves and radiation belt electrons.Bounce-averaged diffusion rates in pitch angle,momentum and cross are calculated by varying the peak wave frequency,the wave normal angle distribution,and the wave latitudinal distribution.Calculation results show that the momentum diffusion coefficients are generally greater by about 100 times than the pitch angle diffusion coefficients,which suggests that L-O mode waves have a potential for producing acceleration of electrons.With the varying normal angle range,the change of diffusion coefficients is not obvious,and the result indicates that diffusion coefficients of the interaction between L-O mode and electrons have little dependence on the normal angle range.In addition,diffusion coefficients are largely determined by the wave latitudinal distributions,which is consistent with the case of R-X mode waves.These results indicate that L-O mode can obviously affect the dynamic of radiation belt electrons under appropriate conditions.

关 键 词：极光千米波 左旋寻常模 波粒相互作用 扩散系数 

分 类 号：P354[天文地球—空间物理学]