The nonadiabatic character of diffusion and the equalization of concentration and temperature in the plasma sheet of the earth magnetosphere

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Magnetospheric Instability, Plasma Diffusion, Plasma Layers, Plasma Temperature, Space Plasmas, Distribution Functions, Lines Of Force, Nonadiabatic Conditions, Plasma Turbulence, Reynolds Number

Scientific paper

The role of stochastic electrostatic fluctuations in the dynamics of the plasma sheet is examined, with particular attention given to causes of the appearance of low-frequency turbulent pulsations. It is shown that, owing to the large value of anomalous diffusion and thermal conductivity, the hypothesis of adiabatic plasma compression in auroral flux tubes is not valid in a number of cases (particularly the case of auroral field lines that are highly extended into the tail). It is concluded that the development of a self-consistent theory of plasma-sheet convection in the framework of the hydrodynamic approximation requires that anomalous diffusion and thermal conductivity be taken into account.

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