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Ion kinetic effects on nonlinear processes of the Kelvin-Helmholtz instability

机译：离子动力学对Kelvin-Helmholtz不稳定性的非线性过程的影响

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摘要

The nonlinear evolution of the Kelvin-Helmholtz (KH) instability at a transverse velocity shear layer in an inhomogeneous space plasma is investigated by means of a four-dimensional (two spatial and two velocity dimensions) electromagnetic Vlasov simulation. When the rotation direction of the primary KH vortex and the direction of ion gyro motion are the same (i.e., the inner product between the vorticity of the primary velocity shear and the magnetic field vector is negative) there exists a strong ion cyclotron damping. In this case, spatial inhomogeneity inside the primary KH vortex is smoothed and the secondary Rayleigh-Taylor/KH instabilities are suppressed. It is also found that another secondary instability on the electron inertial scale is simultaneously generated at secondary shear layers for both cases, but at different locations. The small-scale secondary instability takes place only when the inner product between the vorticity of the secondary shear layer and the magnetic field vector is positive, suggesting the damping of small-scale processes by ion gyro motion. These results indicate that secondary instabilities occurring in the nonlinear stage of the primary KHI show different evolutions depending on the sign of the inner product between the magnetic field and the vorticity of the velocity shear layer.
机译：通过四维（两个空间和两个速度维度）电磁Vlasov模拟研究了在不均匀空间等离子体中横向速度剪切层处的Kelvin-Helmholtz（KH）不稳定性的非线性演化。当初级KH涡旋的旋转方向与离子陀螺运动的方向相同时（即，初级速度切变的涡旋与磁场矢量之间的内积为负），则存在较强的离子回旋加速器阻尼。在这种情况下，初级KH涡旋内部的空间不均匀性得以平滑，并且次级Rayleigh-Taylor / KH不稳定性得到抑制。还发现，在两种情况下，在次级剪切层上同时在不同的位置处同时产生了电子惯性尺度上的另一个次级不稳定性。只有当次级剪切层的涡度与磁场矢量之间的内积为正时，才会发生小规模的次级不稳定性，这表明离子陀螺运动会抑制小规模过程。这些结果表明，在初级KHI的非线性阶段中发生的次级不稳定性根据磁场与速度剪切层涡度之间的内积符号而显示出不同的演变。

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