The dynamics of cyclotron instability, with allowance for heating of the ionosphere

Physics

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Cyclotron Radiation, Ionospheric Heating, Magnetohydrodynamic Stability, Plasma Heating, Plasma Oscillations, Space Plasmas, Distribution Functions, Earth Atmosphere, Electron Distribution, Electron Precipitation, Energy Transfer, High Energy Electrons, Ionospheric Disturbances, Linear Equations, Magnetic Disturbances, Radiation Belts, Whistlers

Scientific paper

A theoretical study is presented of the effect of the heating of the ionospheric plasma on the dynamics of cyclotron instability associated with the excitation of relaxation oscillations. The behavior of the cyclotron instability is described by a quasi-linear equation for the distribution function of radiation-belt electrons and an energy transfer equation for cyclotron waves. It is found that, in the case of typical values of ionosphere and radiation-belt parameters, the presence of plasma heating makes necessary small corrections in the frequency and decrement of relaxation oscillations. The effect of the precipitation of 100-keV electrons during magnetic disturbances on the cyclotron instability is also considered.

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