强迫熵振荡系统中压缩MHD波的放大
Amplification of compressional MHD waves in systems with forced entropy oscillations
摘要：
研究了外驱动系统中磁流体压缩波的传播。假设系统中熵（和温度）的谐振是由于外界熵源和熵汇共同作用的结果。研究发现，在适当的共振条件下，由于参量共振现象，快波和慢波都被放大。此外，它表明，所考虑的波是相互耦合的结果的非平衡状态的背景介质。当等离子体$β\approx 1$。建议的形式主义是足够的一般性，可以适用于许多动力系统，无论是在地面和天体物理条件下。
英文摘要：
The propagation of compressional MHD waves is studied for an externally driven system. It is assumed that the combined action of the external sources and sinks of the entropy results in the harmonic oscillation of the entropy (and temperature) in the system. It is found that with the appropriate resonant conditions fast and slow waves get amplified due to the phenomenon of parametric resonance. Besides, it is shown that the considered waves are mutually coupled as a consequence of the nonequilibrium state of the background medium. The coupling is strongest when the plasma $β\approx 1$. The proposed formalism is sufficiently general and can be applied for many dynamical systems, both under terrestrial and astrophysical conditions.
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