ZhETF, Vol. 133,
p. 429 (February 2008)
(English translation - JETP,
Vol. 106, No. 2,
available online at www.springer.com
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.
Received: April 11, 2007
PACS: 52.35.Bj, 94.30.cq
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.