Structure of Alfvén waves at the skin‐depth scale
Structure of Alfvén waves at the skin‐depth scale
复制标题
趋肤深度尺度的阿尔文波结构
DOI：
10.1063/1.870850
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发表时间：
1994
影响因子：
2.2
通讯作者：
J. Maggs
中科院分区：
文献类型：
--
作者：
G. Morales;R. S. Loritsch;J. Maggs
本文的分析研究表明，在电子趋肤深度数量级上具有横向尺度的剪切阿尔芬波表现出由激发结构边缘发出的传播锥决定的无碰撞发散。由于趋肤效应，轴向电流通道沿锥轨迹呈放射状扩散，并在距离激振器几个波长处形成径向衍射图样。对于碰撞频率略大于波频率的值，阻性扩散允许轴向电流扩展到锥轨迹之外。
This analytical study demonstrates that shear Alfven waves having transverse scale on the order of the electron skin depth exhibit a collisionless divergence determined by propagation cones that emanate from the edges of the exciting structures. Axial current channels are found to spread radially due to the skin effect up to the cone trajectories and at distances of a few wavelengths from the exciter develop radial diffraction patterns. For values of the collision frequency slightly larger than the wave frequency resistive diffusion allows the axial currents to expand beyond the cone trajectories.