Abstract
Rocket and satellite aurora studies reveal the existence of moving small-scale plasma structures of various amplitudes. They were found at high altitudes in the form of electrostatic shocks, weak double layers and ion holes, as well as in auroral E-region with large amplitudes and different scales. We consider the time/space evolution of unstable lower-hybrid and ion-cyclotron waves in the magnetospheric plasmas which propagate nearly perpendicularly to the magnetic field. The MHD system of equations for electrons and one or several ion species with the self-consistent electric field is solved numerically. Conditions for existence of nonlinear quasistationary waves, electrostatic shocks, ion holes are studied by accounting for nonlinearity, collision frequencies, kinematic viscosity, dispersion and violation of quasi-neutrality.
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