X-ray images of auroral arcs for consecutive north and south polar crossings of the DMSP-F6 satellite are presented. On January 18, 1983, the north polar region was in the earth's shadow and the south polar region was in complete sunlight. The x-ray images of both polar cap regions show features of the dawn and dusk auroral oval that are quite similar. However a strong polar cap structure appears only in the north pole image. Near simultaneous measurements of precipitating electrons obtained by instruments aboard the NOAA-6 and NOAA-7 satellites crossing the south pole, show no indication of polar auroral structures. These examples illustrate the utility of x-ray imaging in both sunlight and in darkness for studying auroral boundaries and morphology.