caa a22 4500 386368007 CHVBK 20180307111943.0 cr unu---uuuuu 161130e198906 xx s 000 0 eng 10.1017/S0022377800014021 doi S0022377800014021 pii (NATIONALLICENCE)cambridge-10.1017/S0022377800014021 Coupling between Varma, modified-convective-cell and Alfvén modes in an inhomogeneous plasma [Elektronische Daten] The effect of parallel electron dynamics is incorporated in the study of the Varma mode, which is a flute-like electrostatic ion drift perturbation in an inhomogeneous magnetic field. Starting from the electron and ion continuity equations, an equation for the conservation of the ion magnetic moment, the generalized Ohm's law, and Faraday's and Ampère's laws, we derive a set of four nonlinearly coupled differential equations. The nonlinearities arising from the E × B0 convection of the density and magnetic-moment variations, nonlinear ion polarization drift and Lorentz force, and the coupling of the parallel electron flow to the perturbed magnetic field are included. In the linear limit we find that the Varma mode becomes coupled with the modified-convective-cell and Alfvén modes. The instability of the coupled system is analysed and an expression for the growth rate is obtained. In the nonlinear regime we present the localized dipole vortex solution of the coupled Varma and convective-cell modes as well as the coupled Varma and Alfvén modes. It is found that for the former case the nonlinear structure is a solution of a second-order partial differential equation, whereas for the coupled Varma and inertial Alfvén waves the dipole vortex belongs to a family of fourth-order differential equations. Our results can be useful in understanding the electrostatic and electromagnetic fluctuations in mirror reactors, tokamaks and astrophysical plasmas. Copyright © Cambridge University Press 1989 Shukla P. K. Department of Physics, University of Bochum, D-4630 Bochum l, Federal Republic of Germany de Angelis U. Department of Physical Sciences, University of Naples, 80125 Naples, Italy Jovanović D. Institute of Physics, P.O. Box 57, 11000 Belgrade, Yugoslavia Journal of Plasma Physics Cambridge University Press 41/3(1989-06), 469-477 0022-3778 41:3<469 1989 41 PLA https://doi.org/10.1017/S0022377800014021 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022377800014021 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shukla P. K. Department of Physics, University of Bochum, D-4630 Bochum l, Federal Republic of Germany NATIONALLICENCE 700 1- de Angelis U. Department of Physical Sciences, University of Naples, 80125 Naples, Italy NATIONALLICENCE 700 1- Jovanović D. Institute of Physics, P.O. Box 57, 11000 Belgrade, Yugoslavia NATIONALLICENCE 773 0- Journal of Plasma Physics Cambridge University Press 41/3(1989-06), 469-477 0022-3778 41:3<469 1989 41 PLA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge