1. Some results from the linear theory 2. Nonlinear equations of the acoustic type 3. Nonlinear equations of the optical type 4. Diamagnetism of cyclotron plasma waves and cyclotron solitons 5. Solitary vortices in the atmospheres of rapidly rotating planets 6. Two-dimensional drift vortices in plasmas 7. Solitary toroidal vortices 8. Conservation of helicity and the Lyapunov stability of MHD structures