Premium
Dispersion of kinetic Alfvén wave in a rotating plasma with an inhomogeneous magnetic field
Author(s) -
Liu Y.,
Teng Y.
Publication year - 2018
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201700057
Subject(s) - physics , magnetohydrodynamic drive , magnetic field , plasma , kinetic energy , dispersion (optics) , magnetic pressure , excited state , rotation (mathematics) , field (mathematics) , dispersion relation , magnetohydrodynamics , mechanics , classical mechanics , computational physics , condensed matter physics , atomic physics , magnetization , optics , nuclear physics , quantum mechanics , geometry , mathematics , pure mathematics
The effects of inhomogeneity of a magnetic field on the dispersion of kinetic Alfvén waves ( KAWs ) in a rotating plasma is investigated under the framework of magnetohydrodynamic theory. The magnetic field should be in a non‐uniform state if the centrifugal force is balanced only by the magnetic pressure. The inhomogeneity of the magnetic field increases the frequency of KAW and drives it into an unstable state. The growth rate of KAW varies non‐monotonously with respect to the distance. The KAW will be excited in a certain region with maximum growth rate. And the growth rate of KAW in the region near and far from the centre of rotation approaches zero. These results will be helpful in understanding the properties of KAWs in rotating astrophysical and laboratory plasmas.