Gradient drift instability in high latitude plasma patches: Ion inertial effects
Gradient drift instability in high latitude plasma patches: Ion inertial effects
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高纬度等离子体斑块中的梯度漂移不稳定性：离子惯性效应
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
P. Guzdar
中科院分区：
文献类型：
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作者：
N. Gondarenko;P. Guzdar
对高纬度等离子体斑块具有惯性效应的梯度漂移不稳定性的非线性模拟表明，由梯度漂移不稳定性驱动的初始交叉场细长结构对开尔文-亥姆霍兹不稳定性和剪切流的产生是不稳定的。剪切流在不规则的尺度长度上发展。这两个过程都是由非线性惯性项引起的。计算得到的密度和速度波动水平与观测值相同。平行动力学和次级不稳定性的联合作用可防止贴片在数小时内解体。
Nonlinear simulations of the gradient drift instability with inertial effects for the high latitude plasma patches demonstrate that the initial cross‐field elongated structures, driven by the gradient drift instability, are unstable to the Kelvin‐Helmholtz instability and to the generation of sheared flows. The shear flow develops on the scale‐length of the irregularities. Both these processes arise from the nonlinear inertial term. The computed density and velocity fluctuation levels are of the order of the observed values. The combined effect of parallel dynamics as well as secondary instabilities prevent the patch from disintegrating for hours.