Transient phenomena and secularity of linear interchange instabilities with shear flows in homogeneous magnetic field plasmas
Transient phenomena and secularity of linear interchange instabilities with shear flows in homogeneous magnetic field plasmas
复制标题
均匀磁场等离子体中剪切流线性交换不稳定性的瞬态现象和长期性
DOI：
10.1063/1.1336532
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发表时间：
2001
影响因子：
2.2
通讯作者：
Z. Yoshida
中科院分区：
文献类型：
--
作者：
T. Tatsuno;F. Volponi;Z. Yoshida
通过调用开尔文剪切模式方法，在环境剪切流中分析交换波动的瞬态和长期行为。由于其非厄米性质，剪切流系统中可能会发生复杂的瞬态现象。剪切流混合和阿尔文波传播的综合作用克服了足够长的时间内的不稳定驱动力，并阻尼了磁通量的所有波动。另一方面，静电扰动可能会导致足够强的交换驱动不稳定。每种情况下的时间渐近行为都是代数的（非指数的）。
Transient and secular behaviors of interchange fluctuations are analyzed in an ambient shear flow by invoking Kelvin’s method of shearing modes. Because of its non-Hermitian property, complex transient phenomena can occur in a shear flow system. The combined effect of shear flow mixing and Alfven wave propagation overcomes the instability driving force at sufficiently large time, and damps all fluctuations of the magnetic flux. On the other hand, electrostatic perturbations can be destabilized for sufficiently strong interchange drive. The time asymptotic behavior in each case is algebraic (nonexponential).