The book examines the propagation of electromagnetic waves of different frequencies in both isotropic and magnetoactive plasma. Both the case of homogeneous and the case of heterogeneous media. are discussed. Special attention is paid to the propagation of radio waves in the ionosphere and space conditions. A separate chapter is devoted to nonlinear phenomena in plasma located in an alternating electromagnetic field. A significant place is given to the account of spatial dispersion in the propagation of waves in plasma. B), it is possible to investigate all the important cases of interest in the study of the ionosphere, magnetosphere and outer space For the convenience of readers, a summary of the formulas is given in two paragraphs and, in addition, the book is provided with a large list of additional literature.