INFLUENCE OF HOT ANISOTROPIC IONS ON PROPERTIES OF NONLINEAR ALFVEN WAVES

The influence on properties of nonlinear Alfven waves produced by the introduction of a small quantity of hot anisotropic ions into the cold background plasma is studied. Nonlinear equations are obtained which describe the evolution of Alfven waves propagating along magnetic fiel d fines. The addition of a small amount of hot anisotropic ions to the cold plasma results in a qualitative modification of the evolution eq uations in comparison with those obtained for a cold two-species plasm a. A characteristic feature of the system is that a nonlinear stage of evolution is accompanied by the appearance of an electric field direc ted along the external magnetic field. Some specific solutions of thes e nonlinear equations are given. The stability of finite-amplitude mon ochromatic waves during the small-amplitude phase and in the presence of amplitude modulations is investigated.