Abstract
Measurements made by the incoherent scatter radar at Chatanika, Alaska, have been combined with S3‐2 satellite data to study the relationships between conductivities, electric fields, and currents near the Harang discontinuity. Three S3‐2 passes were chosen for the study, based on the quality of the radar and satellite data and the availability of supplementary ground‐ and space‐based observations. The radar measured electric fields and conductivities as a function of latitude and local time. The satellite measured the latitudinal distribution of electric field and field‐aligned current during the three polar passes. The dominant field‐aligned current in the midnight sector is upward. Equatorward of this current a downward sheet is observed which is the eastern end of the evening sector region 2 sheet. Poleward of the upward current are several sheets of varying directions and magnitudes. These sheets are associated with active aurora during substorms. The most intense electric fields were located at the poleward and equatorward boundaries of the upward current sheet. A model is presented which demonstrates the self‐consistency of the observed relationships between conductivities, electric fields, and currents.
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