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DOI | 10.1029/2020GL092305 |
Whistler‐mode waves trapped by density irregularities in the Earth's magnetosphere | |
Yangguang Ke; Lunjin Chen; Xinliang Gao; Quanming Lu; Xueyi Wang; Rui Chen; Huayue Chen; Shui Wang | |
2021-03-10 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | Whistler‐mode waves are electromagnetic waves pervasively observed in the Earth's and other planetary magnetospheres. They are considered to be mainly responsible for producing the hazardous radiation and diffuse aurora, which heavily relies on their properties. Density irregularities, frequently observed in the Earth's magnetospheres, are found to change largely the properties of whistler‐mode waves. Here we report, using Van Allen Probes measurements, whistler‐mode waves strongly modulated by two different density enhancements. With particle‐in‐cell simulations, we propose wave trapping caused by field‐aligned density irregularities (ducts) may account for this phenomenon. Simulation results show that whistler‐mode waves can be trapped inside the enhanced density ducts. These trapped waves remain quasi‐parallel and usually get much larger amplitudes than those unducted whistler waves during propagation away from the magnetic equator, and tend to focus at a spatially narrow channel, consistent with observations. Our results imply density irregularities may be significant to modulate radiation‐belt electrons. This article is protected by copyright. All rights reserved. |
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/318598 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Yangguang Ke,Lunjin Chen,Xinliang Gao,等. Whistler‐mode waves trapped by density irregularities in the Earth's magnetosphere[J]. Geophysical Research Letters,2021. |
APA | Yangguang Ke.,Lunjin Chen.,Xinliang Gao.,Quanming Lu.,Xueyi Wang.,...&Shui Wang.(2021).Whistler‐mode waves trapped by density irregularities in the Earth's magnetosphere.Geophysical Research Letters. |
MLA | Yangguang Ke,et al."Whistler‐mode waves trapped by density irregularities in the Earth's magnetosphere".Geophysical Research Letters (2021). |
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