In the interest of speed and economy the notation of the orig inal text has been retained so that the cross product of two vectors A and B is denoted by AB], the dot product by (AB), the Laplacian operator by . etc. It might also be worth pointing out that the temperature is frequently expressed in energy units in the Soviet literature so that the Boltzmann constant will be missing in various familiar expressions. In matters of terminology, whenever pos sible several forms are used when a term is first introduced, e. g., magnetoacoustic and magnetosonic waves, "probkotron" and mirror...