The effects of a conducting E layer on classical F region cross-field plasma diffusion

Physics

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Atmospheric Diffusion, Crossed Fields, E Region, F Region, Ionospheric Conductivity, Plasma Diffusion, Atmospheric Models, Atmospheric Physics, Magnetohydrodynamic Stability, Plasma Density

Scientific paper

The role of classical diffusion in removing irregularities in the polar ionosphere is examined, and the effect of diffusion on the growth rate of plasma instabilities is studied. A simple model is developed to describe the effects of a conducting E layer on diffusion processes in the F region. The presence of the E layer conductor is shown to enhance the cross-field ambipolar diffusion constant over that appropriate for an insulating E region. The essential physics of the model is described. It is found that the classical cross-field plasma diffusion rate in the F region ionosphere can be increased by an order of magnitude or more when the magnetic field lines connect to a highly conducting E layer below. The cross-field diffusion rate is strongly affected by the height of the F layer and the ratio of E to F region Pedersen conductivities.

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