Steady‐state solutions for relativistically strong electromagnetic waves in plasmas
Steady‐state solutions for relativistically strong electromagnetic waves in plasmas
复制标题
等离子体中相对论性强电磁波的稳态解
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
C. Max
中科院分区：
文献类型：
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作者：
C. Max
导出了新的稳态解，它描述了强到足以使等离子体离子和电子相对论的电磁波。在整个过程中使用双流体模型。研究了下列解：（1）相速度远大于c的线偏振波;（2）冷均匀等离子体中相速度接近c的任意偏振波;（3）以标量压力张量为特征的均匀等离子体中的圆偏振波。由于相对论效应引入的非线性，所有这些波都能够在正常的过密等离子体中传播。以强到足以使电子而不是离子相对论性的圆偏振波为例，研究了相对论性强波在密度梯度中的传播。结果表明，这样的波传播恒定的能量通量，尽管系统的非线性。然而，非线性效应可以大大增加相对论性强波可以传播的最大等离子体密度。
New steady‐state solutions are derived which describe electromagnetic waves strong enough to make plasma ions and electrons relativistic. A two‐fluid model is used throughout. The following solutions are studied: (1) Linearly polarized waves with phase velocity much greater than c; (2) arbitrarily polarized waves with phase velocity near c, in a cold uniform plasma; (3) circularly polarized waves in a uniform plasma characterized by a scalar pressure tensor. All of these waves are capable of propagating in normally overdense plasmas, due to nonlinearities introduced by relativistic effects. The propagation of relativistically strong waves in a density gradient is examined, for the example of a circularly polarized wave strong enough to make electrons but not ions relativistic. It is shown that such a wave propagates at constant energy flux despite the nonlinearity of the system. However, nonlinear effects can greatly increase the maximum plasma density at which a relativistically strong wave can propagate...