Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...413....7t&link_type=abstract
Astronomy and Astrophysics, v.413, p.7-15 (2004)
Astronomy and Astrophysics
Astrophysics
5
Magnetohydrodynamics (Mhd), Instabilities
Scientific paper
The present paper is the continuation of our study of absolute and convective instabilities in open shear layers \citep{ter03}. In this paper the effects of a magnetic field are included and a series of fully non-linear ideal polytropic 2D MHD numerical simulations is carried out. The amount of mean flow required to sweep away the perturbation before it grows and destroys the whole flow is calculated for various configurations of the magnetic field. The analytical results obtained by \citet{fej64} for a velocity discontinuity were recovered with a very good accuracy. The study focused on uniform, discontinuous and sheared magnetic fields. We found that the value of mean flow needed for a perturbation to become convectively unstable (critical mean flow) decreased with decreasing value of the plasma β. We also found that the low β value side, of a discontinuous and sheared magnetic field, is predominant in the behaviour of the instability. Finally we show the thickness of the magnetic shear layer has no effect on the value of critical mean flow.
Erdelyi Robert
Terra-Homem M.
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