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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
2015-06-01
发表期刊PHYSICS OF PLASMAS
卷号22期号:6
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.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.1063/1.4922753
关键词[WOS]SOLAR-WIND ; PLASMA ENVIRONMENT ; IONOPAUSE ; SIMULATION ; STABILITY ; MHD ; BOUNDARY ; EXPRESS ; FLOW
收录类别SCI
语种英语
WOS研究方向Physics
WOS类目Physics, Fluids & Plasmas
WOS记录号WOS:000357689500051
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/16009
专题暗物质和空间天文实验室
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
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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).
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