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

Evolution of Kelvin-Helmholtz instability at Venus in the presence of the parallel magnetic field
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平行磁场存在下金星开尔文-亥姆霍兹不稳定性的演化

DOI:
10.1063/1.4922753
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发表时间:
2014-08
期刊:
影响因子:
2.2
通讯作者:
Y. S. Ge
Y. S. Ge
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Lu H. Y.;J. B. Cao;T. L. Zhang;H. S. Fu;Y. S. Ge

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二维 MHD 模拟旨在研究金星电离顶上的开尔文-亥姆霍兹 (KH) 不稳定性的演化,以响应平行于流动方向的面内磁场中的强剪切速度流。我们模拟的关键结果是,密度增加和边界层上的平行磁性分量都起到了稳定不稳定性的作用。在高密度比情况下,最终准稳态下的总磁能值远大于初始状态,这与低密度增加时的情况有很大区别。具有高密度增加和均匀磁场的情况的非线性发展令人感兴趣的是在不稳定性饱和之前形成单个磁岛。在非线性发展阶段,新的磁岛的出现与狭窄的高卷起密度区域内发生的磁重联相关,将预先存在的磁岛组合在一起形成准稳定的两岛图案。
Two-dimensional MHD simulation was performed to study the evolution of Kelvin-Helmholtz (KH) instability on Venusian ionopause in response to the strong sheared velocity flow in presence of the in-plane magnetic field parallel to the direction of the flow. The Key result from our simulations is that both of the density increase and the parallel magnetic component on the boundary layer play a role of stabilizing the instability. In the high density ratio cases, the value of final total magnetic energy in the quasi-steady status is much more than that of the initial status, which is quite distinct from that with low density increase. The nonlinear development of case with high density increase and uniform magnetic field is of interest that a single magnetic island forms before the instability saturation. In the non-linear development phase, a new magnetic island arises associated with magnetic reconnection occurring inside the narrow high rolled up density region, combining the pre-existing magnetic island together to form a quasi-steady two island pattern.
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