High-frequency extensions of magnetorotational instability in astrophysical plasmas

Details High-frequency extensions of magnetorotational instability in astrophysical plasmas High-frequency extensions of magnetorotational instability in astrophysical plasmas

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008plphr..34..678m&link_type=abstract

Plasma Physics Reports, Volume 34, Issue 8, pp.678-687

Physics

Plasma Physics

52.35.Bj, 94.30.Cq

Scientific paper

High-frequency extensions of magnetorotational instability driven by the Velikhov effect beyond the standard magnetohydrodynamic (MHD) regime are studied. The existence of the well-known Hall regime and a new electron inertia regime is demonstrated. The electron inertia regime is realized for a lesser plasma magnetization of rotating plasma than that in the Hall regime. It includes the subregime of nonmagnetized electrons. It is shown that, in contrast to the standard MHD regime and the Hall regime, magnetorotational instability in this subregime can be driven only at positive values of dlnΩ/ dln r, where Ω is the plasma rotation frequency and r is the radial coordinate. The permittivity of rotating plasma beyond the standard MHD regime, including both the Hall regime and the electron inertia regime, is calculated.

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