Scaling of anisotropic spectra due to the weak interaction of shear-Alfven wave packets
Scaling of anisotropic spectra due to the weak interaction of shear-Alfven wave packets
复制标题
DOI：
10.1063/1.872158
复制
发表时间：
1997-03-01
影响因子：
2.2
通讯作者：
Bhattacharjee, A
中科院分区：
文献类型：
--
作者：
Ng, CS;Bhattacharjee, A
弱磁流体动力学湍流在均匀磁场的存在下，主要是由三波相互作用，介导的剪切阿尔芬波包的碰撞在平行于磁场的相反方向传播。三波耦合的标度计算的渐近分析和直接数值计算的非线性相互作用的基础上减少磁流体动力学方程。本文导出了三波耦合谱指数与两个随机振幅波包谱指数之间的新关系。这种关系对各向异性能谱具有重要意义。(C)1997年美国物理学会。
Weak magnetohydrodynamic turbulence in the presence of a uniform magnetic field is dominated by three-wave interactions that mediate the collisions of shear-Alfven wave packets propagating in opposite directions parallel to the magnetic field. The scaling of three-wave couplings is calculated by asymptotic analysis and a direct numerical evaluation of the nonlinear interaction based on the reduced magnetohydrodynamic equations. A new relation is derived between the spectral index of three-wave coupling and the spectral indices of two random-amplitude wave packets. This relation has significant implications for the anisotropic energy spectrum. (C) 1997 American Institute of Physics.