Quasi-resonant parametric decay of a magnetoacoustic wave into two Alfvén waves in a heat-releasing plasma is considered. It is shown that in the case of isentropical instability under the resonant conditions (zero frequency detuning) the Alfvén waves undergo bi-exponential amplification. The presence of frequency detuning prior to this amplification gives rise to parametric modulation of the Alfvén wave amplitude, whose duration increases with detuning. A boundary frequency detuning is determined, at which there is no amplification of the Alfvén waves.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 3–8, February, 2019.
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Belov, S.А., Molevich, N.E. & Zavershinskii, D.I. Alfvén Wave Amplification as a Result of Parametric Quasi-Resonant Interaction with Magnetoacoustic Waves in Heat-Releasing Isentropically Unstable Plasma. Russ Phys J 62, 179–185 (2019). https://doi.org/10.1007/s11182-019-01699-8
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DOI: https://doi.org/10.1007/s11182-019-01699-8