Characteristic patterns of the high-latitude, ionospheric electric potential have been derived for two groups, with and without the occurrence of magnetospheric substorms, and for all orientations of the interplanetary magnetic field (IMF). These maps were derived from all available, simultaneous Dynamics Explorer 2 and solar wind data, using a least error fit technique. There are distinctive patterns for each orientation of the IMF, both with and without substorms in progress. In comparison to the nonsubstorm electric potential patterns, the substorm group tends to have a more pronounced Harang discontinuity near midnight. The averages of the AE indices that were measured simultaneously with the electric potentials have also been analyzed. The AU index is found to be linearly proportional to the electric potential in the dusk cell, while the |AL| index compared with the dawn cell's potential has a nonlinear trend. The |AL| index is distinctively greater for the substorm group, as expected, while the electric potential and AU index remain relatively unchanged. The measured electric potential patterns have been combined with a conductivity model in order to derive ionospheric and field-aligned currents. The Harang discontinuity is prominent in the horizontal ionospheric currents, particularly for the substorm group. Model calculations of |AL| indicate that some of the substorm increase can be accounted for by an enhanced auroral conductivity, while the changes in the electric field's magnitude and orientation near midnight, in distortions that do not significantly increase the overall potential drop, also contribute to the substorm electrojet. The field-aligned currents show a systematic evolution of the region 1 and region 2 current belts as the IMF changes from a +Y to -Y orientation. For negative BY the upward currents form a continuous oval, linking the region 2 current on the dawn side with the region 1 current on the dusk side, through both noon and midnight. For positive BY the upward currents are no longer continuous through noon and are divided by downward current linking the region 2 current on the duskside with the region 1 current on the dawnside. The region 0 or cusp currents, which move from prenoon to postnoon as the IMF BY changes from positive to negative, appear to be continuations of the post/prenoon region 1 current belts. ¿ 1999 American Geophysical Union