Soft particle spectrometer and energetic particle detector data from the Isis 2 polar-orbiting satellite are organized in the framework of the eastward electrojet flowing in the local time range around dusk. The structure of the ionospheric electrojets is inferred from ground-based magnetic data using a meridian line of magnetometers through western Canada. Irregularities in lattitude profiles of the magnetometer data near the dusk meridian indicate that there is a double structure within the current flow, with strong eastward current flow in the poleward portion of the electrojet. Precipitating energetic electron fluxes are found within this region of strong eastward current flow in the poleward portion of the electrojet. No significant energetic electron or proton fluxes are found in the equatorward portion of the eastward electrojet. Using realistic models of the ionospheric and field-aligned currents flowing in the evening sector, it is demonstrated that a portion of the eastward electrojet in the postnoon quadrant flows up the field lines into the magnetosphere at the dusk meridian. It is suggested that this segment of the eastward electrojet exists because of the presence of a poleward electric in the sunlit ionosphere and that upward field-aligned current flow occurs at the conductivity discontinuity between the sunlit and dark ionospheres.