Amplification of compressional MHD waves in systems with forced entropy oscillations

Details Amplification of compressional MHD waves in systems with forced entropy oscillations Amplification of compressional MHD waves in systems with forced entropy oscillations

2007-09-06

arxiv.org/abs/0709.0846v1

Phys.Rev.E76:046404,2007

Astronomy and Astrophysics

Astrophysics

14 pages, 4 figures, Accepted to Physical Review E

Scientific paper

10.1103/PhysRevE.76.046404

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 $\beta \approx 1$. The proposed formalism is sufficiently general and can be applied for many dynamical systems, both under terrestrial and astrophysical conditions.

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