冷磁化等离子体中电子波折射率的模型表达式
Model expressions for refractive indices of electron waves in cold magnetoactive plasma
AI总结：
本文为冷磁化等离子体中全部四种电子波模提出了形式不依赖等离子体频率与回旋频率之比的简单折射率表达式，弥补了此前仅哨声波等特例有解析表达式的不足。
摘要：
尽管拥有相当简单的磁化等离子体波模折射率解析表达式无疑具有重要意义，但此类表达式仅在少数特定情形下已知。对于频率远高于低混杂共振频率的电子波，此类表达式仅在稠密等离子体中的哨声波情形下已知，此时电子等离子体频率显著超过电子回旋频率。在本文中，我们针对磁化等离子体中全部四种电子模提出了简单的可操作折射率表达式，即快磁声模（亦称哨声模）、慢异常模、寻常模和快异常模。这些表达式的形式不依赖于等离子体频率与回旋频率之比的具体数值。
英文摘要：
Despite the undoubted importance of having fairly simple analytical expressions for the refractive indices of wave modes in a magnetoactive plasma, such expressions are known only in some particular cases. For electron waves with frequencies much higher than the lower hybrid resonance frequency, such an expression is known only for whistler waves in a dense plasma when the electron plasma frequency significantly exceeds the electron cyclotron frequency. In this Letter, we propose simple operational expressions for the refractive indices of all four electron modes in a magnetoactive plasma, namely, the fast magnetosonic, also called whistler mode, the slow extraordinary mode, the ordinary mode, and the fast extraordinary mode. The form of these expressions does not depend on the value of the ratio of plasma frequency to cyclotron frequency.
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