Larmor radius and collisional effects on gravitational instability of a composite rotating plasma

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Collisional Plasmas, Gravitational Effects, Magnetohydrodynamic Stability, Rotating Plasmas, Two Fluid Models, Wave Propagation, Astronomical Models, Ionized Gases, Jeans Theory, Magnetohydrodynamic Flow, Plasma Conductivity, Plasma Turbulence, Plasma Waves

Scientific paper

Gravitational instability of an infinitely conducting hydromagnetic composite rotating plasma is considered to include simultaneously the finite Larmor radius effects and the frictional effects with neutrals. It is found that Jeans' criterion of instability holds good in the presence of rotation, finite Larmor radius and collisions with neutrals. The particular cases of the above effects on the waves propagated along and perpendicular to the magnetic field have been discussed. The effect of rotation is to decrease the Larmor radius by an amount depending upon the wave number of perturbation

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