气候变化领域集成服务门户(CCPortal): Magnetospheric Multiscale Observations of Earth's Oblique Bow Shock Reformation by Foreshock Ultralow-Frequency Waves

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DOI	10.1029/2020GL091184
	Magnetospheric Multiscale Observations of Earth's Oblique Bow Shock Reformation by Foreshock Ultralow-Frequency Waves
	Liu T.Z.; Hao Y.; Wilson L.B.; III; Turner D.L.; Zhang H.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
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 Ultralow-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. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earthquakes; Magnetosphere; Collisionless shocks; Direct observations; Magnetosheaths; Magnetospheric multi scale; Nonstationary; Reformation process; Ultra low frequencies; Upstream conditions; Plasma shock waves
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169187
作者单位	Cooperative Programs for the Advancement of Earth System Science, University Corporation for Atmospheric Research, Boulder, CO, United States; Geophysical Institute, University of Alaska, Fairbanks, AK, United States; Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China; Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Johns Hopkins University Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, United States
推荐引用方式 GB/T 7714	Liu T.Z.,Hao Y.,Wilson L.B.,et al. Magnetospheric Multiscale Observations of Earth's Oblique Bow Shock Reformation by Foreshock Ultralow-Frequency Waves[J],2021,48(2).
APA	Liu T.Z.,Hao Y.,Wilson L.B.,III,Turner D.L.,&Zhang H..(2021).Magnetospheric Multiscale Observations of Earth's Oblique Bow Shock Reformation by Foreshock Ultralow-Frequency Waves.Geophysical Research Letters,48(2).
MLA	Liu T.Z.,et al."Magnetospheric Multiscale Observations of Earth's Oblique Bow Shock Reformation by Foreshock Ultralow-Frequency Waves".Geophysical Research Letters 48.2(2021).