Spectrum of parametrically exitied bulk acoustic wave composite resonator

Mansfeld, G.D.; Polzikova, N. I.; Raevskiǐ, A. O.; Prokhorova, I.G.

doi:10.1109/ultsym.2003.1293176

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“…Some efforts have already been taken to extend the model in this direction before. For instance, studies have been conducted on the parametric amplification of acoustic waves [1,19,36] also including systems that are exposed to periodic variations of external electric (piezoelectric medium) [15] or magnetic (magnetostrictive solids) [29] fields. These variations indeed give birth to oscillations of the phase speeds of the waves leading to the parametric amplification of them under certain resonant conditions.…”

Section: Introductionmentioning

confidence: 99%

Amplification of compressional magnetohydrodynamic waves in systems with forced entropy oscillations

et al. 2007

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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. In addition, 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 approximately 1 . The proposed formalism is sufficiently general and can be applied to many dynamical systems, both under terrestrial and astrophysical conditions.

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