Аскаплоты советских станций за 1979 год : (оперативно-информационный материал) / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т. – Апатиты : Кольский филиал АН СССР, 1982.

12 AURORAL ACTIVITY IN 1979. PA index variations (the upward going scale) and Kp (the downward going scale) for each day of 1979 are shown in Pig.1. Sashed lines link the points having gaps. As during the previous year good agreement between aurorae and magnetic activity variations is observed. Seasonal variations of aurorae (PA-index), magnetic field (Kp-index) and solar activity (Wolf numbers) are shown in Pig.2a. Pig.2b contains the same parameters averaged for 1972-1974 and 1977-1979. In 1979 semiannual variations of aurorae and Wolf numbers are practically absent. Decrease of auroral activity is notable from the begining to the end of the year. Solar activity continued to increase in 1979. It had its minimum in spring which was followed by considerable rise toward the winter. Insignificant equinox maxima were observed in magnetic field variations only but they are shifted towards summer months (April and August). The amplitude of seasonal variations averaged for 1972-1974 and 1977-1979 is very small. For aurorae an annual wave with minimum in summer and maximum in winter is observed, though it might have been additionally influenced by apparatus effect since the summer activity index is based on the data from Antarctic where the net work of stations is very rare. Solar and magnetic activity have their maxima in September and in April respectively. Fig.2e shows the difference between the seasonal variations in 1979 (given in Pig.2a) and average values (Pig.2b). Sharp increase of solar activity during each month of 1979, as compared with averaged values, is a characteristic feature of the period. In general these differences follow the seasonal variations of solar activity in 1979. Practically seasonal variations of the magnetic field and aurorae coincide with average values in 1979. Annual variations of solar activity, magnetic field and aurorae for 1972-1974 and 1977-1979 are given in Pig.3. The main peculiarity of the period is a sharp increase of solar activity which began in 1978, though it did not influence the magnetic field and aurorae.