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Journal ArticleDOI

Stability of a Stratified Layer of a Gravitating Partially Ionized Plasma

01 Jan 1987-Contributions To Plasma Physics (John Wiley & Sons, Ltd)-Vol. 27, Iss: 2, pp 105-111
TL;DR: Etude de l'instabilite dans une couche stratifiee de plasma partiellement ionise auto-gravitant, en presence des effets des courants de Hall.
Abstract: Etude de l'instabilite dans une couche stratifiee de plasma partiellement ionise auto-gravitant, en presence des effets des courants de Hall. Determination de la relation de dispersion par une methode variationnelle pour un plasma situe dans un champ magnetique vertical uniforme. Les courants de Hall ont un effet destabilisateur, alors que les effets de friction du gaz neutre ont une influence stabilisante
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TL;DR: In this paper, the instability in a horizontal layer of a partially ionized self gravitating plasma has been studied to include simultaneously the effects of Hall currents, viscosity and finiteness of Larmor radius (FLR).
Abstract: The instability in a horizontal layer of a partially ionized self gravitating plasma has been studied to include simultaneously the effects of Hall currents, viscosity and finiteness of Larmor radius (FLR). The ambient magnetic field is assumed to be uniform and vertical. Proper solutions have been obtained through the variational methods for a semi-infinite plasma in which the density has an exponential gradient along the vertical. The dispersion relation obtained has been solved numerically and it is found that the growth rate of unstable perturbations decreases with the effects of viscosity, neutral gas friction and FLR. The influence of effects of viscosity, neutral gas friction and FLR are consequently stabilizing. It is found that the Hall currents have a destabilizing influence as the growth rate is found to increase with this effect.

2 citations

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Journal ArticleDOI
TL;DR: In this paper, the onset of steady convection in a polytropic atmosphere with constant viscosity was studied numerically, and the authors showed that the convection rate in such an environment is stable.
Abstract: The onset of steady convection in a polytropic atmosphere with constant viscosity is studied numerically. (AIP)

169 citations