Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. IV - Single shear layer in MHD flows

Astronomy and Astrophysics – Astrophysics

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Astrophysics, Kelvin-Helmholtz Instability, Magnetohydrodynamic Flow, Shear Layers, Velocity Distribution, Vortex Sheets

Scientific paper

In this further paper on the physics of Kelvin-Helmholtz instabilities the authors investigate the case in which the fluids in relative motion are magnetized and separated by a shear layer. The present study points out, with respect to previous treatments, that different velocity profiles affect perturbations of short wavelength (as compared to the scale of the shear). Another new result is the destabilizing effect, even in the subsonic regime, of the magnetic field on modes neutrally stable in the vortex sheet approximation. Such a behaviour is analogous to that found in the fluid case for Mach numbers ⪆2. Possible astrophysical implications are also discussed.

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