Аскаплоты советских станций за 1983 год : (оперативно-информационный материал) / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т. – Апатиты : Кольский филиал АН СССР, 1990.

13 than for the preceding year /5/ but then the correlation waa defined for the whole year and the averaging was done for three daya. Figure 5 given the cycle variation. The increase of the auroral activity contirmea on the descending branch of the solar activity. There is obviously seen a splitting of the auroral activity maximum around the maximum of Wolf numbers that is in good correlation with the results obtained in /10/. The magnetic activity in 1983 fell down, a little but waa still high. Figure 6a presents the seasonal variation for the examine-i year. The solar activity was maximum in May-July and minimum in autumnal equinox and October-December. As a first approximation the auroral activity variation reflects variations of Wolf numbers that causes appearance of equinoxial minima instead of maxima. It is peculiar.that seasonal variation of magnetic activity is anti-phased to solar and auroral ones. A distinct extended minimum is observed in June-August, whereas the maxima are observed in February-April and in November. Thus, the sharp autumn equinoxial maximum Is shifted to a later period. Figure 66 presents mean seasonal variations for 1972-1903- A distinct seasonal variation is not observed for solar and auroral activity. The vernal equinoxial maximum is seen in magnetic activity variations and there is a tendency for increasing in October, Figure 6 b displays the curves of difference betwe'en the values of corresponding activity in 1983 and mean values for 1972-1983 for each month. They characterize the peculiarities of seasonal variations in 1983. Since there is no seasonal variation for mean values of solax- and auroral activity then variations of difference reflect the situation given in Flg.oa., Since the magnetic and auroral activity in 1983 is obviously higher than the mean value (see Fig.5) the differential curves for F. Kp are always positive, whereas variations of differences for polar auroras are mainly above zero.