Abstract
Visual observations made at Halley Bay, Antarctica, in the years 1956–1965 are used to study variations in the position of quiet homogeneous arcs. The diurnal variations in median latitude and mean azimuth of the highest point on the lower border of the arcs are similar from year to year. The annual median latitudes and mean azimuths show no evidence of systematic variation during the solar cycle. The median latitude of all arcs is 66.7°S in θ 4 coordinates. The corresponding value at the peak of the auroral incidence curve presented by Stringer and Belon is found to be 67°. The diurnal variation in position, found using all measurements made from 1956 to 1965, can be fitted to the pattern of arc orientations found by Gustaffson.
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