A technique has been developed that allows the analysis of magnetometer data from Atmosphere Explorer C during those periods when the spacecraft is spinning and eclipsed (not sunlit). The utilization of these magnetometer measurements to determine field-aligned current structure in conjunction with energetic particle and plasma convection measurements from AE-C enables us to determine relationships between these phenomena in the nighttime auroral zone. From a study of some 18 auroral oval crossings in the sectors 1800--2200 MLT and 0100-0600 MLT it is observed that, in general, the regions of energetic electron precipitation (>1 keV) span both region 1 and region 2 currents with the poleward boundary of the region 1 currents approximately coincident with the poleward kilovolt electron boundary. Simultaneous observations of plasma convection indicate that the reversal from sunward to antisunward convection is also, in general, collocated to within a degree of invariant latitude to the poleward field-aligned current boundary in both the evening and morning sectors. It is seen that the low conductivity in the winter polar cap implies the absence of field-aligned currents in that region. The data indicate that the region 1 currents in the late evening and early morning sectors lie on closed field lines extending earthward from the inner edge of the magnetospheric boundary layer.