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A theory of magnetosphere‐ionosphere coupling in the presence of field‐aligned potential drops is formulated within the framework of magnetohydrodynamic equations. Our formulation allows the magnetosphere as well as the ionosphere to respond self‐consistently to the parallel potential drop along auroral field lines. Equipotential contours are distorted into a V‐shaped structure near the convection reversal boundary and S‐shaped on the equatorward side, each gives rise to an inverted V precipitation band. The loading effect of the imperfect coupling results in a valley in the electric field profile which occurs equatorward of the convection reversal boundary.
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Kan et al. (1980) studied this question.
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