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DOI | 10.1029/2020GL087791 |
Controlling the chirping of chorus waves via magnetic field inhomogeneity | |
Yifan Wu; Xin Tao; Fulvio Zonca; Liu Chen; Shui Wang | |
2020-05-07 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2020 |
英文摘要 | Whistler mode chorus waves are coherent electromagnetic emissions in planetary magnetospheres, characterized by rising‐tone or falling‐tone chirping elements. Understanding the cause of different chirping directions and their properties is an important step in resolving the long‐standing problem of nonlinear chorus generation. We report here, for the first time, particle‐in‐cell simulations of bi‐directional chirping of whistler waves in a uniform magnetic field, and falling‐tone only chirping in an inhomogeneous field. Combined with previous simulations of rising‐tone only emissions, we demonstrate that the background magnetic field inhomogeneity is not required for chirping of chorus, but it plays a key role in determining the chirping direction. The findings of the present work also unveil the critical role of the dipole geometry of Earth's magnetic field in causing the statistical predominance of rising‐tone chorus, and the oblique propagation of falling‐tone chorus. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249190 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Yifan Wu,Xin Tao,Fulvio Zonca,et al. Controlling the chirping of chorus waves via magnetic field inhomogeneity[J]. Geophysical Research Letters,2020. |
APA | Yifan Wu,Xin Tao,Fulvio Zonca,Liu Chen,&Shui Wang.(2020).Controlling the chirping of chorus waves via magnetic field inhomogeneity.Geophysical Research Letters. |
MLA | Yifan Wu,et al."Controlling the chirping of chorus waves via magnetic field inhomogeneity".Geophysical Research Letters (2020). |
条目包含的文件 | 条目无相关文件。 |
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