Abstract
Quasi-resonant parametric decay of a magnetoacoustic wave into two Alfven 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 Alfven waves undergo bi-exponential amplification. The presence of frequency detuning prior to this amplification gives rise to parametric modulation of the Alfven wave amplitude, whose duration increases with detuning. A boundary frequency detuning is determined, at which there is no amplification of the Alfven waves.
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