Abstract
Quasi-continuous radio aurora observations have been made at Kuehlungsborn. D.D.R. ( φ = 54°N) by a 33 MHz radar during the period 1958–1981. From these observations characteristic diurnal, seasonal and solar cycle variations of the probability of occurrence of auroral radar echoes at medium latitude have become evident. Whereas the solar cycle variation of auroral activity is very similar to that of the geomagnetic activity, this is only partly true for the seasonal variation, and not at all for the diurnal variation. The seasonal variation is slightly modified in addition by a tendency to higher aurora probability in winter than at the same level of geomagnetic activity in summer, and the diurnal variation is almost totally determined by the diurnal variation of the horizontal electric field in the ionosphere. Also, an influence of the sector structure of the interplanetary magnetic field upon the diurnal and seasonal variations of radio aurora activity has been identified.
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