Bibcode
Ruderman, M. S.; Ballai, I.; Khomenko, E.; Collados, M.
Bibliographical reference
Astronomy and Astrophysics, Volume 609, id.A23, 11 pp.
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1
2018
Journal
Citations
11
Refereed citations
11
Description
Aims: In the present study we investigate the nature of the
magnetic Rayleigh-Taylor instability appearing at a tangential
discontinuity in a partially ionised plasma when the effect of magnetic
shear is taken into account. Methods: The partially ionised
character of the plasma is described by the ambipolar diffusion in the
induction equation. The dynamics of the plasma is investigated in a
single-fluid approximation. After matching the solutions on both sides
of the interface we derive a dispersion equation and calculate the
instability increment using analytical methods for particular cases of
parameters, and numerical investigation for a wide range of parameters.
Results: We calculated the dependence of the instability
increment on the perturbation wavenumber. We also calculated the
dependence of the maximum instability increment on the shear angle of
the magnetic field for various values of the ionisation degree.
Conclusions: Our results show that the Rayleigh-Taylor instability
becomes sensitive to the degree of plasma ionisation only for plasmas
with small values of plasma beta and in a very weakly ionised state.
Perturbations are unstable only for those wavenumbers that are below a
cut-off value.
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