Electrodynamics of rotating planetary plasmaspheres in a dipole magnetic field.

Physics

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Planetary Magnetospheres: Magnetohydrodynamics, Planetary Magnetospheres: Electrodynamics

Scientific paper

As a model of the actual structure of the planetary plasmasphere, the authors consider the electrodynamical problem of electric field and current generation by a planet with a dipole magnetic field corotating with a plasma envelope. The plasma envelope is characterized by the conductivity and angular velocity of the magnetospheric plasma as functions of the distance r from the planet center and the angle θ measured from the rotation axis. The exact solutions of Maxwell equations are obtained in the axially symmetric case within the framework of unipole electrodynamics when the rotational and magnetic axes coincide. These solutions describe the possible distributions of electric fields, currents, and charges in the rotating plasma envelope surrounding the magnetized planet. As an example, the authors constructed the exact solution corresponding to diverse structures of the plasmasphere.

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