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Linear modes in the partially ionized heliosphere plasma

Published online by Cambridge University Press:  06 January 2011

M. E. KELLUM  and
DASTGEER SHAIKH
M. E. KELLUM
Affiliation:
Division of Mathematics, Calhoun Community College, P.O. Box 2216 Decatur, AL 35609-2216, USA
DASTGEER SHAIKH
Affiliation:
Department of Physics and Center for Space Physics and Aeronomic Research (CSPAR), University of Alabama at Huntsville, Huntsville, AL 35805, USA (dastgeer.shaikh@gmail.com)
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Abstract

The heliosphere is predominantly a partially ionized plasma that consists of electrons, ions and significant neutral atoms. Nonlinear interactions among these species take place through direct collision or charge-exchange processes. These interactions modify linear and nonlinear properties of the plasma. In this work, we develop a one-dimensional linear theory to investigate linear instabilities in such a system. In our model, the electrons and ions are described by a single fluid compressible magnetohydrodynamic (MHD) model and are coupled self-consistently to the neutral fluid via compressible hydrodynamic equations. The coupling is mediated by the charge-exchange process. Based on our self-consistent analysis, we find that the charge-exchange coupling is more effective at larger length scales, and the Alfvén waves are not affected by the charge-exchange coupling. By contrast, the fast and slow waves are driven linearly unstable.

Type
Papers
Information
Journal of Plasma Physics , Volume 77 , Issue 5 , October 2011 , pp. 577 - 588
Copyright
Copyright © Cambridge University Press 2011

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