气候变化领域集成服务门户(CCPortal): Decay of Kelvin-Helmholtz Vortices at the Earth's Magnetopause Under Pure Southward IMF Conditions

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DOI	10.1029/2020GL087574
	Decay of Kelvin-Helmholtz Vortices at the Earth's Magnetopause Under Pure Southward IMF Conditions
	Nakamura T.K.M.; Plaschke F.; Hasegawa H.; Liu Y.-H.; Hwang K.-J.; Blasl K.A.; Nakamura R.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:13
英文摘要	At the Earth's low-latitude magnetopause, clear signatures of the Kelvin-Helmholtz (KH) waves have been frequently observed during periods of the northward interplanetary magnetic field (IMF), whereas these signatures have been much less frequently observed during the southward IMF. Here, we performed the first 3-D fully kinetic simulation of the magnetopause KH instability under the southward IMF condition. The simulation demonstrates that fast magnetic reconnection is induced at multiple locations along the vortex edge in an early nonlinear growth phase of the instability. The reconnection outflow jets significantly disrupt the flow of the nonlinear KH vortex, while the disrupted turbulent flow strongly bends and twists the reconnected field lines. The resulting coupling of the complex field and flow patterns within the magnetopause boundary layer leads to a quick decay of the vortex structure, which may explain the difference in the observation probability of KH waves between northward and southward IMF conditions. ©2020. The Authors.
英文关键词	Boundary layers; Magnetic fields; Magnetopause; Interplanetary magnetic fields; Kelvin-Helmholtz; Kelvin-helmholtz vortices; Kinetic simulation; Low-latitude magnetopause; Magnetic reconnections; Nonlinear growth; Vortex structures; Vortex flow; boundary layer; Earth; interplanetary dust; Kelvin-Helmholtz instability; magnetic field; magnetopause; turbulent flow; vortex
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/170197
作者单位	Space Research Institute, Austrian Academy of Sciences, Graz, Austria; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; Department of Physics and Astronomy, Dartmouth College, Hanover, NH, United States; Southwest Research Institute, San Antonio, TX, United States; Institute of Physics, University of Graz, Graz, Austria
推荐引用方式 GB/T 7714	Nakamura T.K.M.,Plaschke F.,Hasegawa H.,et al. Decay of Kelvin-Helmholtz Vortices at the Earth's Magnetopause Under Pure Southward IMF Conditions[J],2020,47(13).
APA	Nakamura T.K.M..,Plaschke F..,Hasegawa H..,Liu Y.-H..,Hwang K.-J..,...&Nakamura R..(2020).Decay of Kelvin-Helmholtz Vortices at the Earth's Magnetopause Under Pure Southward IMF Conditions.Geophysical Research Letters,47(13).
MLA	Nakamura T.K.M.,et al."Decay of Kelvin-Helmholtz Vortices at the Earth's Magnetopause Under Pure Southward IMF Conditions".Geophysical Research Letters 47.13(2020).