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- W4246104865 abstract "We have carried out a theoretical analysis of the stability and parallel structure of coupled shear-Alfven and slow-magnetosonic waves in the Earth's inner magnetosphere including effects of finite anisotropic plasma pressure. Multiscale perturbation analysis of the anisotropic Grad-Shafranov equation yields an approximate self-consistent magnetohydrodynamic (MHD) equilibrium. This MHD equilibrium is used in the numerical solution of a set of eigenmode equations which describe the field line eigenfrequency, linear stability, and parallel eigenmode structure. We call these modes anisotropic Alfven-ballooning modes. The main results are: The field line eigenfrequency can be significantly lowered by finite pressure effects. The parallel mode structure of the transverse wave components is fairly insensitive to changes in the plasma pressure but the compressional magnetic component can become highly peaked near the magnetic equator due to increased pressure, especially when P[perpendicular] > P[parallel]. For the isotropic case ballooning instability can occur when the ratio of the plasma pressure to the magnetic pressure, exceeds a critical value [beta][sub o][sup B] [approx] 3.5 at the equator. Compared to the isotropic case the critical beta value is lowered by anisotropy, either due to decreased field-line-bending stabilization when P[parallel] > P[perpendicular], or due to increased ballooning-mirror destabilization when P[perpendicular] > P[parallel]. We use a [beta]-6 stability diagram'' to display the regions of instability with respect to the equatorial values of the parameters [bar [beta]] and [delta], where [bar [beta]] = (1/3)([beta][sub [parallel]] + 2 [beta][perpendicular]) is an average beta value and [delta] = 1 - P[parallel]/P[perpendicular] is a measure of the plasma anisotropy." @default.
- W4246104865 created "2022-05-12" @default.
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- W4246104865 date "1993-05-01" @default.
- W4246104865 modified "2023-09-30" @default.
- W4246104865 title "Anisotropic Alfven-ballooning modes in the Earth's magnetosphere" @default.
- W4246104865 doi "https://doi.org/10.2172/6327525" @default.
- W4246104865 hasPublicationYear "1993" @default.
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