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- W2193122953 abstract "This letter discusses rotating magnetohydrodynamics (MHD) of a thin layer of astrophysical plasma. To describe a thin plasma layer with a free surface in a vertical external magnetic field we use the shallow water ap- proximation. The presence of a vertical magnetic field essentially changed the wave processes dynamics in astrophysical plasma compared to the neu- tral uid and plasma layer in a thoroidal magnetic field. In present case thre are three-waves nonlinear interactions. Using the asymptotic mul- tiscale we deduced nonlinear wave packets interaction equations: three magneto-Poincare waves interaction, three magnetostrophic waves inter- action, the interaction of two magneto-Poincare and one magnetostrophic wave and two magnetostrophic and one magneto-Poincare wave interac- tion. The existence of decay instabilities and parametric amplifications is predicted. We found following four types of decay instabilities: magneto- Poincare wave decays into two magneto-Poincare waves, magnetostrophic wave decays into two magnetostrophic waves, magneto-Poincare wave de- cays into one magneto-Poincare wave and one magnetostrophic wave, magnetostrophic wave decays into one magnetostrophic wave and one magneto-Poincare wave. Also following mechanisms of parametric amplifications were found: parametric amplification of magneto-Poincare waves, parametric amplification of magnetostrophic waves, magneto-Poincare wave amplification in magnetostrophic wave presence nd magnetostrophic wave amplification in magneto-Poincare wave presence. The instabilities growth rates and parametrical amplifications factors were found respectively." @default.
- W2193122953 created "2016-06-24" @default.
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- W2193122953 date "2015-12-06" @default.
- W2193122953 modified "2023-09-27" @default.
- W2193122953 title "Parametric Instabilities in Shallow Water Magnetohydrodynamics Of Astrophysical Plasma in External Magnetic Field" @default.
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