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New low-frequency electromagnetic modes associated with neutral dynamics in partially ionised plasma

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journal contribution
posted on 13.07.2015, 14:45 by A. A. Shaikh, A. C. Das
Abstract. We have investigated the low frequency electromagnetic (EM) modes in inhomogeneous, magnetised partially ionised plasma by incorporating neutral dynamics. We have derived a general EM dispersion relation by using a two-fluids magnetohydrodynamics (MHD) model. Our analysis shows that the neutral dynamics is playing an extremely important role in the physics of magnetised partially ionised plasma by giving rise to new kind of EM modes. We found (1) the new instability is linked with compressibility of neutral particles, the collision between neutral and charged species and the relative streaming in hot/cold, inhomogeneous, magnetised partially ionised plasma, (2) and that neutral dynamics is responsible for the modified (complex) inertial effect on magnetic field lines. Its consequences on the propagation characteristics of Alfvén wave and cyclotron frequency are discussed. Furthermore, a new mode similar to the Langmuir mode is reported. Finally, we discuss our results, for limiting cases, that may be appropriate for applications to space plasma environments including probable mechanism of escaping H[superscript: +] and O[superscript: −] from the Martian atmosphere.

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Citation

Annales Geophysicae, 2013, 31, pp. 983-993

Version

VoR (Version of Record)

Published in

Annales Geophysicae

Publisher

Copernicus Publications on behalf of the European Geosciences Union

issn

0992-7689

eissn

1432-0576

Acceptance date

23/04/2013

Copyright date

2013

Available date

13/07/2015

Publisher version

http://www.ann-geophys.net/31/983/2013/angeo-31-983-2013.html

Language

en

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