Excitation of zonal flows by kinetic Alfvén waves
Excitation of zonal flows by kinetic Alfvén waves
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DOI：
10.1063/1.1826095
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发表时间：
2005
影响因子：
2.2
通讯作者：
P. Shukla
中科院分区：
文献类型：
--
作者：
P. Shukla
重新检查了色散动力学阿尔文波 (DKAW) 和静电对流池/纬向流之间的非线性耦合。提出了一组方程，这些方程表现出 DKAW 的标量和平行矢量势与层状流的标量势之间的非线性耦合，该层流由磁化等离子体中 DKAW 的雷诺应力增强。然后对方程进行傅里叶分析以获得非线性色散关系。后者表现出调制不稳定性，这可能是均匀磁化等离子体中层流增强的原因。纬向流可以调节实验室磁等离子体以及地球磁层和日冕中等离子体粒子的传输。
Nonlinear couplings between dispersive kinetic Alfven waves (DKAWs) and electrostatic convective cells∕zonal flows are reexamined. A set of equations that exhibit nonlinear couplings between the scalar and parallel vector potentials of the DKAWs and the scalar potential of zonal flows that are reinforced by the Reynolds stresses of the DKAWs in a magnetized plasma is presented. The equations are then Fourier-analyzed to obtain the nonlinear dispersion relation. The latter exhibits modulational instabilities, which could be responsible for enhanced zonal flows in a uniform magnetized plasma. Zonal flows can regulate the transport of plasma particles in laboratory magnetoplasmas as well as in the Earth’s magnetosphere and in the solar corona.