This paper presents the results of a study to determine the relationships between radar aurora, visual aurora, and auroral electrojets in the evening sector. The data, taken on Marcy 21, 1973 (UT), consisted of (1) auroral echo maps obtained with a 398-M Hz phased array radar located at Homer, Alaska, (2) magnetograms and all-sky-camera photographs taken along the Alaskan meridian network of stations, and (3) Chatanika incoherent scatter radar measurements. The study showed that diffuse auroral echoes obtained at 398 M Hz can be used to map the spatial distribution of the eastward electrojet. Discrete visual arcs were almost invariably found to occur poleward of (but often adjacent to) the eastward electrojet (as defined by the diffuse radar aurora) and within the westward electrojet region (as defined by ground magnetometer data). When discrete radar echoes were observed, they were associated only with bright visual arcs. Furthermore, the association was usually confined to only the most equatorward visual arcs located closest to the poleward boundary of the eastwlard electrojet. This confinement was interpreted as being produced by a decrease with latitude in electric field strength, associated with the Harang discontinuity region.