The several criteria that have been used for a determination of the statistical auroral zone are reviewed. It is seen that quite different criteria have given the same all-time statistical location of maximum auroral activity. In this study the criterion of auroral incidence has been used to analyze all-sky camera data for the year 1964–1965. The relationship between auroral incidence and magnetic activity is such that when the K index from magnetic observatories in the auroral zone is zero, auroral incidence maximizes at latitudes greater than dp 70°N. As the K index increases, the peak of auroral incidence moves rapidly southward. The low-latitude part of the incidence profile becomes steeper as K increases, while the high-latitude portion always exhibits a gradual decrease toward high latitudes. The results of this study indicate that it is possible to synthesize the IQSY auroral incidence profile on the basis of magnetic activity and therefore, independently of seeing conditions. Comparison of IGY and IQSY auroral profiles of incidence versus dp latitudes shows that the dp latitude of peak incidence (dp 66.5°) did not change during this period. The profiles are different in form, however. To the south of the incidence peak the IQSY profile converges to zero incidence at dp 62°, while the IGY profile shows a relative incidence of 20% at this latitude, and to the north of the incidence peak, the IQSY profile shows higher relative incidence than the IGY profile.