Streaming of a Plasma through a Magnetic Dipole Field

The two-dimensional motion of a plasma in an inhomogeneous magnetic field with circular symmetry and a homogeneous external field under the influence of an electric field was studied previously [E. T. Karlson, Phys. Fluids 5, 476 (1962)]. The influence of space charges was taken into account. However, the treatment was generally valid only when no forbidden regions for the particles exist. When the inhomogeneity is strong enough, such forbidden regions will arise. The treatment is now generalized, so that it is valid for this case also. A discussion is given of the possibility to explain geomagnetic storms and auroral phenomena within the framework of the present theory.

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