High-frequency extensions of magnetorotational instability in astrophysical plasmas

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 dln Omega/dlnr, where Omega 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.

Russian Foundation for Basic Research[06-02-16767]

Russian Foundation for Basic Research

RF Program for State Support of Leading Scientific Schools[9878.2006.2]

RF Program for State Support of Leading Scientific Schools

International Science and Technology Center

International Science and Technology Center[G-1217]

Science and Technology Center in Ukraine

Science and Technology Center in Ukraine[3473]

Research Foundation of the State of Sao Paulo (FAPESP)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

National Council of Scientific and Technological Development (CNPq)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Ministry of Science and Technology of the Federative Republic of Brazil

Ministry of Science and Technology of the Federative Republic of Brazil