On MHD waves, fire-hose and mirror instabilities in anisotropic plasmas

On MHD waves, fire-hose and mirror instabilities in anisotropic plasmas

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Temperature or pressure anisotropies are characteristic of space plasmas, standard magnetohydrodynamic (MHD) model for describing large-scale plasma phenomena however usually assumes isotropic pressure.In this paper we examine the characteristics of MHD waves, fire-hose and mirror instabilities in anisotropic homogeneous magnetized plasmas.The model equations are a set of gyrotropic MHD equations closed by the generalized Chew-Goldberger-Low (CGL) laws with two polytropic exponents representing various thermodynamic conditions.Both ions and electrons are allowed to have iphone 7 folie separate plasma beta, pressure anisotropy and energy equations.The properties of linear MHD waves and instability criteria are examined and numerical examples for the nonlinear evolutions of slow waves, fire-hose and mirror instabilities are shown.

One significant result is that slow waves may develop not only mirror instability but also a new type of compressible fire-hose instability.Their corresponding nonlinear structures thus may exhibit anticorrelated density and magnetic field perturbations, a property used for iphone 14 pro max price maryland identifying slow and mirror mode structures in the space plasma environment.The conditions for nonlinear saturation of both fire-hose and mirror instabilities are examined.