Nonlinear electrostatic waves and structures in the collisional ionospheric plasma

The excitation and nonlinear evolution of the electrostatic Farley-Buneman (FB) plasma instabilities in the E-region of the auroral ionosphere are investigated. Basing on the MHD system of equations for a collisional plasmas with magnetized electrons, ν_e<<ω_ce , and non-magnetized ions, ν_i>>ω_ci , (ν_e, ν_i are the collision frequencies of the electrons and ions with the neutral particles and ω_ce, ω_ci are the electron and ion gyrofrequencies) the evolution equations for the electrostatic potential and electron density are obtained. Various nonlinear effects which lead to the stabilization of the FB instability are considered: influences of the ion viscosity, deviations from quasi-neutrality, electron and ion inertia and coherent interaction of three and four waves. It is shown, that the main nonlinear mechanism of stabilization of the FB instability is the coherent interaction of three and four FB waves. Thereby, in the region of linear damping of the coherent waves, nonlinear waves are generated, which have large aspect and flow angles. The numerical simulation for wide ranges of different parameters of the interacting waves shows that stationary, periodic and quasi-stochastic scenarios of the stabilization of the FB instability are possible. The special model of a plasma consisting of electrons, ions and charged dust grains is also considered. It is shown, that the dust grain charge fluctuations lead to significant modifications of the properties of the FB waves and structures.