Chaos in the parallel sheared plasma flow driven electromagnetic turbulence in nonuniform magnetoplasmas

By employing the two-fluid model, a system of nonlinear equations for low-f requency electromagnetic waves in nonuniform collisional magnetoplasmas has been derived. The plasma contains both the equilibrium density gradient an d sheared flows. In the linear limit, a local dispersion relation has been obtained and analyzed in several interesting limiting cases. It is found th at equilibrium sheared plasma flows cause instabilities of Alfven-type wave s even in the absence of the density gradient. The numerical results also s how a large growth rate of electromagnetic parallel velocity shear (PVS) mo de compared to the electrostatic mode for some ionospheric parameters. For this case, the temporal nonlinear behavior of the relevant governing mode c oupling equations is governed by six coupled equations, which are a general ization of the Lorenz-Stenflo equations and which admit chaotic trajectorie s. The results of this investigation should be useful for understanding the linear and nonlinear properties of electromagnetic waves that are generate d by sheared plasma flows in magnetized plasmas. (C) 1999 American Institut e of Physics. [S1070-664X(99)03604-6].