Abstract
The simultaneous development of the high-latitude positive bay and the ring-current field is found with the proton aurora in the evening sector, all of which are attributable to the drifting protons associated with magnetospheric substorm. The sign of ΔZ is dependent on whether the geomagnetic station, where the positive H-bay is observed, is on the pole side of the most active region of the proton aurora or on the equator side. The order of magnitude of the positive bay is reasonably explained by an enhancement of the ionospheric conductivity due to the proton precipitation with the suitable energy flux. It is suggested that the positive bay is produced by the eastward electrojet possibly connected with the partial ring current in the magnetosphere.
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