Evolution of Kelvin-Helmholtz instability at Venus in the presence of the parallel magnetic field

doi:10.1063/1.4922753

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	Evolution of Kelvin-Helmholtz instability at Venus in the presence of the parallel magnetic field
	Lu, H. Y.1,2; Cao, J. B.1; Zhang, T. L.3; Fu, H. S.1; Ge, Y. S.4
刊名	PHYSICS OF PLASMAS
	2015-06-01
卷号	22 期号:6
DOI	10.1063/1.4922753
文献子类	Article
英文摘要	Two-dimensional MHD simulations were performed to study the evolution of the Kelvin-Helmholtz (KH) instability at the Venusian ionopause in response to the strong flow shear in presence of the in-plane magnetic field parallel to the flow direction. The physical behavior of the KH instability as well as the triggering and occurrence conditions for highly rolled-up vortices are characterized through several physical parameters, including Alfven Mach number on the upper side of the layer, the density ratio, and the ratio of parallel magnetic fields between two sides of the layer. Using these parameters, the simulations show that both the high density ratio and the parallel magnetic field component across the boundary layer play a role of stabilizing the instability. In the high density ratio case, the amount of total magnetic energy in the final quasi-steady status is much more than that in the initial status, which is clearly different from the case with low density ratio. We particularly investigate the nonlinear development of the case that has a high density ratio and uniform magnetic field. Before the instability saturation, a single magnetic island is formed and evolves into two quasi-steady islands in the non-linear phase. A quasi-steady pattern eventually forms and is embedded within a uniform magnetic field and a broadened boundary layer. The estimation of loss rates of ions from Venus indicates that the stabilizing effect of the parallel magnetic field component on the KH instability becomes strong in the case of high density ratio. (C) 2015 AIP Publishing LLC.
WOS关键词	SOLAR-WIND ; PLASMA ENVIRONMENT ; IONOPAUSE ; SIMULATION ; STABILITY ; MHD ; BOUNDARY ; EXPRESS ; FLOW
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000357689500051
资助机构	National Natural Science Foundation of China (NSFC)(41474124 ; National Natural Science Foundation of China (NSFC)(41474124 ; Specialized Research Fund for Key Laboratory of Planetary Sciences in Chinese Academy of Sciences ; Specialized Research Fund for Key Laboratory of Planetary Sciences in Chinese Academy of Sciences ; 41204131 ; 41204131 ; 41431071) ; 41431071) ; National Natural Science Foundation of China (NSFC)(41474124 ; National Natural Science Foundation of China (NSFC)(41474124 ; Specialized Research Fund for Key Laboratory of Planetary Sciences in Chinese Academy of Sciences ; Specialized Research Fund for Key Laboratory of Planetary Sciences in Chinese Academy of Sciences ; 41204131 ; 41204131 ; 41431071) ; 41431071)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62314]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
作者单位	1.Beihang Univ, Space Sci Inst, Sch Astronaut, Beijing 100191, Peoples R China 2.Chinese Acad Sci, Key Lab Planetary Sci, Nanjing 210008, Peoples R China 3.Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Lu, H. Y.,Cao, J. B.,Zhang, T. L.,et al. Evolution of Kelvin-Helmholtz instability at Venus in the presence of the parallel magnetic field[J]. PHYSICS OF PLASMAS,2015,22(6).
APA	Lu, H. Y.,Cao, J. B.,Zhang, T. L.,Fu, H. S.,&Ge, Y. S..(2015).Evolution of Kelvin-Helmholtz instability at Venus in the presence of the parallel magnetic field.PHYSICS OF PLASMAS,22(6).
MLA	Lu, H. Y.,et al."Evolution of Kelvin-Helmholtz instability at Venus in the presence of the parallel magnetic field".PHYSICS OF PLASMAS 22.6(2015).