Magnetohydrodynamic waves and the Kelvin-Helmholtz instability at the boundary 
of plasma mediums

Cheremnykh, O.; Cheremnykh, S.; Kozak, L.; Kronberg, Elena A.

doi:10.1063/1.5048913

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Magnetohydrodynamic waves and the Kelvin-Helmholtz instability at the boundary of plasma mediums

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Kronberg, Elena A.
Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Cheremnykh, O., Cheremnykh, S., Kozak, L., & Kronberg, E. A. (2018). Magnetohydrodynamic waves and the Kelvin-Helmholtz instability at the boundary of plasma mediums. Physics of Plasmas, 25(10): 102119. doi:10.1063/1.5048913.

Cite as: https://hdl.handle.net/21.11116/0000-0002-E0E4-F

Abstract

It has been theoretically established that shear plasma flows at the boundary of the medium can generate eight MHD modes, of which only one can be unstable due to the development of the Kelvin-Helmholtz instability. It is shown that oblique perturbations propagating at an angle with respect to the velocity vector play a dominant role in the development of this instability. Analytic expressions are obtained for the criteria and instability increments that take into account the angle of propagation of perturbations, the effect of the magnetic field, and the compressibility of the medium and in the limiting cases coincide with the previously obtained results. It is noted that the appearance of a large number of waves can lead to a flow with a complicated structure at the boundary of the magnetotail.