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DOI | 10.1029/2020GL091184 |
Magnetospheric Multiscale observations of Earth’s oblique bow shock reformation by foreshock ultra‐low frequency waves | |
Terry Z. Liu; Yufei Hao; Lynn B. Wilson; Drew L. Turner; Hui Zhang | |
2020-12-19 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2020 |
英文摘要 | Collisionless shocks can be nonstationary with periodic reformation shown in many simulation results, but direct observations are still tenuous and difficult to conclusively interpret. In this study, using Magnetospheric Multiscale (MMS) observations, we report direct observational evidence of Earth’s oblique bow shock reformation driven by the foreshock ultra‐low frequency (ULF) waves. When the four MMS spacecraft were in a string‐of‐pearls formation roughly along the bow shock normal, they observed that when each period of foreshock ULF waves encountered the bow shock, a new shock ramp formed. Meanwhile, in the magnetosheath, the old bow shock’s remnants were observed periodically convecting downstream. We propose that the reformation mechanism of the oblique bow shock is the variation of the upstream conditions by the periodic ULF waves as they encounter the bow shock. We also examine the nature of reflected ions during the reformation process. 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/308117 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Terry Z. Liu,Yufei Hao,Lynn B. Wilson,等. Magnetospheric Multiscale observations of Earth’s oblique bow shock reformation by foreshock ultra‐low frequency waves[J]. Geophysical Research Letters,2020. |
APA | Terry Z. Liu,Yufei Hao,Lynn B. Wilson,Drew L. Turner,&Hui Zhang.(2020).Magnetospheric Multiscale observations of Earth’s oblique bow shock reformation by foreshock ultra‐low frequency waves.Geophysical Research Letters. |
MLA | Terry Z. Liu,et al."Magnetospheric Multiscale observations of Earth’s oblique bow shock reformation by foreshock ultra‐low frequency waves".Geophysical Research Letters (2020). |
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