Propagation Characteristics of Whistler-Mode Chorus during Geomagnetic Activities  

作　　者：周庆华 贺艺华 何兆国 杨昶 

机构地区：[1]School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410004 [2]State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190

出　　处：《Chinese Physics Letters》2010年第5期170-173,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 40874076, 40925014 and 40774078, the Special Fund for Public Welfare Industry （meteorology） under Grant No GYHY200806024, and the Specialized Research Fund for State Key Laboratories for Space Weather.

摘　　要：A recently introduced ray-tracing method is adopted to study the propagation characteristics of whistler-mode chorus during different geomagnetic activities by using a global core plasma density model. Numerical calculations show that chorus waves tend to settle on a preferable magnetic shell L in the vicinity of the plasmapause. During high geomagnetic activity, the plasmapause position moves inward close to the Earth and chorus trajectories move inward together with plasmapause. The trajectory move closer to the plasmapause as θ increases. Chorus wave with lower frequencies will reflect multiple times while chorus wave with higher frequencies reflect once at the plasmapause before settling on the vicinity of the plasmapause. The current results present a first detailed study on the propagation characteristics of chorus during geomagnetic activities, and may account for the observation that chorus tends to be present in the vicinity of the plasmapause.

关 键 词：地磁活动 传播特性 位置移动 跟踪方法 密度模型 等离子体 计算结果 地球轨道 

分 类 号：P353.8[天文地球—空间物理学] TN011[天文地球—地球物理学]