Short scale electrostatic vortices driven by electrons sheared flow parallel to external magnetic field in heavier ion plasmas

摘要

Nonlinear equations for an electrostatic perturbation in hybrid frequency range are derived in a magnetized heavier ion plasma assuming that the electrons are flowing with a sheared velocity along the initial external constant magnetic field B _(0z)?. As a result of this current, the total zero-order magnetic field becomes sheared as B _0 = B _(0z)?z + B _(0y)(x)?. Such a system can give rise to unstable electrostatic waves under certain conditions. The solutions of the nonlinear equations are obtained in the form of dipolar vortices, which can play an important role in plasma transport across field lines. This work can be useful for the future experiments on sheared electron flows.