Anisotropy of charged-particle temperatures in the earth's ionosphere and plasmasphere

Computer Science

Scientific paper

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Charged Particles, Particle Energy, Plasma Temperature, Plasmasphere, Space Plasmas, Anisotropy, Degrees Of Freedom, Earth Ionosphere, Nonuniform Plasmas, Relaxation (Mechanics)

Scientific paper

A simple method for assessing the anisotropy of plasma temperatures in the ionosphere and plasmasphere is proposed on the basis of an analysis of the relaxation of the energy-distribution anisotropy of charged particles in a multicomponent plasma. This method is used to evaluate a number of possible mechanisms for the formation of the nonuniform distribution of plasma thermal energy over the degrees of freedom. It is shown that nonuniform heat transfer can lead to a considerable temperature anisotropy only for plasmasphere regions with L greater than about 3, where magnetospheric disturbances lead to low values of plasma density (less than about 1000/cu cm), producing a decrease in relaxation. In addition, it is shown that longitudinal electric fields are an effective source of electron-temperature anisotropy not only in the plasmasphere but also in the upper ionosphere.

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