Abstract
Onset criteria for unstable Rayleigh–Taylor modes in partially ionized dusty plasmas are derived for different density characteristics of the neutral gas and dust components across the interface where the modes are excited. The influences of a homogeneous equilibrium magnetic field and magnetic perturbations are taken into account. Dust–neutral gas collisions limit the range of unstable wave lengths. Different from (magneto)hydrodynamic modes in one-component neutral fully ionized fluids, increase of the mass density of the heavier fluid does not tend to a destabilization of all excited modes in the stratified fluid layer.
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