The plasmapause as a plasma sheath - A minimum thickness

Physics

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Cold Plasmas, Plasma Sheaths, Plasmapause, Boundary Layer Plasmas, Magnetohydrodynamic Waves, Mathematical Models, Maxwell Equation, Vlasov Equations

Scientific paper

The plasmapause is considered as a stationary boundary layer (a sheath) separating two types of plasmas characterized by different temperatures and densities: on one side, the hot trapped particles imbedded in the cold exospheric plasma of ionospheric origin; on the other side, the plasmatrough including the hot ring-current particles. The structure of this layer is described by a kinetic model using the Vlasov-Maxwell equations for the charged particles and fields. In the absence of any collisional effects or wave-particle interactions, a minimum value for the thickness of the plasmapause is deduced which is of the order of 5 times the Larmor radius of the cold ions.

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