EFFECT OF PRESSURE ANISOTROPY ON MAGNETOROTATIONAL INSTABILITY
Mikhailovskii A.B., Lominadze J.G., Churikov A.P., Erokhin N.N., Erokhin N.S., Tsypin V.S.

Поступила в редакцию: 11 Апреля 2007

PACS: 52.35.Bj, 94.30.cq

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It is shown that two new instabilities of hybrid type can occur in a rotating magnetized plasma with anisotropic pressure, i. e., the rotational firehose instability and the rotational mirror instability. In the case of , where and are the ratios of the parallel and perpendicular plasma pressure to the magnetic field pressure, the pressure anisotropy tends to suppress both new instabilities; in the case , it leads to their strengthening. In the last case, the perturbations considered can be unstable even if the Velikhov instability criterion is not satisfied.