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The propagation of compressional MHD waves is studied for an externallydriven system. It is assumed that the combined action of the external sourcesand sinks of the entropy results in the harmonic oscillation of the entropy(and temperature) in the system. It is found that with the appropriate resonantconditions fast and slow waves get amplified due to the phenomenon ofparametric resonance. Besides, it is shown that the considered waves aremutually coupled as a consequence of the nonequilibrium state of the backgroundmedium. The coupling is strongest when the plasma $\beta \approx 1$. Theproposed formalism is sufficiently general and can be applied for manydynamical systems, both under terrestrial and astrophysical conditions.

Amplification of compressional MHD waves in systems with forced entropy oscillations