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On the stability of the tangential discontinuity interface in dusty plasma

Published online by Cambridge University Press:  20 January 2015

A. I. Ershkovich  and
P. L. Israelevich
A. I. Ershkovich*
Affiliation:
Department of Earth Sciences, Tel Aviv University, Ramat Aviv, 69978, Israel
P. L. Israelevich
Affiliation:
Department of Earth Sciences, Tel Aviv University, Ramat Aviv, 69978, Israel
*
†Email address for correspondence: alexer@post.tau.ac.il
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Abstract

Stability of the plane tangential discontinuity (TD) interface in a multi-component dusty plasma (ions, electrons, neutral particles and charged dust) is considered in hydrodynamical approximation. The criterion of stability does not depend on the presence of dust only on one side of the discontinuity but is changed if the dust penetrates through the discontinuity. Therefore, if the instability criterion is marginal, even weak penetration of the dust through the interface may induce Kelvin–Helmholtz instability. This conclusion also refers to cylindrical TD in the presence of dust, so that generation of helical waves in astrophysical jets, type I comet tails, etc. due to the shear driven Kelvin–Helmholtz instability may be hampered in dusty objects of such a geometry.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 3 , June 2015 , 905810304
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Copyright
Copyright © Cambridge University Press 2015 

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