On the role of the magnetic field intensity in the process of spontaneous excitation of the ion-cyclotron oscillations in fully ionized plasmas

This paper investigates the region of very small non-isothermalities (Tsub(e)/Tsub(i)<1.25) and determines the trend of the variation of the threshold electron drift necessary for spontaneous excitation of the longwave ion-cyclotron oscillations for nearly isothermal plasmas. Kinetic equations for one-particle distribution functions with the Landau collision integrals are used, and the condition of marginal instability is investigated in detail. (Auth.)