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DOI | 10.1029/2021GL095648 |
Off-equatorial Minima Effects on ULF Wave-ion Interaction in the Dayside Outer Magnetosphere | |
Xing-Yu Li; Zhi-Yang Liu; Qiu-Gang Zong; Xu-Zhi Zhou; Yi-Xin Hao; Craig Pollock; Christopher Russell; Per-Arne Lindqvist | |
2021-09-13 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | The ultra-low frequency (ULF) wave-particle drift-bounce resonance in the inner magnetosphere has been studied in detail, due to its important role in particle energization. However, it remains an open question how drift-bounce resonance manifests in the dayside outer magnetosphere, where particles’ orbits show bifurcations because of off-equatorial magnetic field minima. In this study, we investigate this question, by analyzing Magnetospheric Multiscale (MMS) observations of the January 20, 2017 event. A test-particle simulation is conducted to help us understand the observations. The observed pitch angle-time spectrograms show “pawtrack-like” structures. We find there are more than two resonant pitch angles at fixed energy, since off-equatorial minima change the relationship between the bounce (drift) frequency and pitch angle from unimodal function to trimodal function. These results reveal a new drift-bounce acceleration mechanism in the dayside outer magnetosphere, which potentially affects the efficiency of particle energization during geomagnetic activities like geomagnetic storms. |
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/338722 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Xing-Yu Li,Zhi-Yang Liu,Qiu-Gang Zong,et al. Off-equatorial Minima Effects on ULF Wave-ion Interaction in the Dayside Outer Magnetosphere[J]. Geophysical Research Letters,2021. |
APA | Xing-Yu Li.,Zhi-Yang Liu.,Qiu-Gang Zong.,Xu-Zhi Zhou.,Yi-Xin Hao.,...&Per-Arne Lindqvist.(2021).Off-equatorial Minima Effects on ULF Wave-ion Interaction in the Dayside Outer Magnetosphere.Geophysical Research Letters. |
MLA | Xing-Yu Li,et al."Off-equatorial Minima Effects on ULF Wave-ion Interaction in the Dayside Outer Magnetosphere".Geophysical Research Letters (2021). |
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