Development of the electromagnetic field in the magnetosphere‐ionosphere system is examined under the condition that a constant current generator supplies current to the system after t=0. It is shown that at high altitudes there are intervals when the electric field is transiently directed opposite to the direction of the supplied current. Namely, transient dusk‐to‐dawn electric field can be generated from ionospheric channeling of the dawn‐to‐dusk tail current during an early stage of the development of the tail‐ionosphere current system. Electric field with the opposite polarity is produced during intervals when the field reflected from the ionosphere dominates over the incident field.
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A. Nishida (1979) studied this question.