Аскаплоты советских станций за 1978 год : (оперативно-информационный материал) / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т. – Апатиты : Кольский филиал АН СССР, 1981.

12 index obtaining. Trough in the Table denotes absence of observations at that day at local midnight. Auroral activity in 1978. PA index variation during each day of 1978 are pre sented in Fig«3i dashes are linking the points, between which the gaps took place. The corresponding Kp index variation (scale below) is shown there either. Good ag reement between aurorae and magnetic field variations is observed even at summer time,when due to small number of operating stations in Antarctic,the information about aurorae are less correct. Active periods in Fig.3 agree rather good, but amplitude ra tio varies. Seasonal variations of aurorae (PA-index), of magnetic field (Jfp-index) and so lar activity (Wolf numerals) are shown in Fig.4a. Here the link between aurorae and magnetic field variation.is worse. Two equinoctial maxima of Kp-index are observed, the spring maximum is higher and slightly shifted to the summer (maximum in April). The most active aurorae are observed in December and February with some reduce in January. Aurorae activity is reduced during summer months. With the solar activity maxima the general level of Wolf numerals in 1978 is higher. Seasonal variation is weakly manifested. There is one maximum in September with the following slight redu cing and new rise in the end of the year. Fig.4b contains seasonal variations of the same parameters averaged for all the years of ascaplots publishing, that is for 1972-1974 and 1977-1978. So that the curves are obtained by averaging of 5 -years data, their statistical correctness is essentially higher. The characterizing peculaxity lies in evident discrepancy between seasonal variations of aurorae and magnetic field activities. We have two clear maxima for PA index in February and November, that is equinoctial maxima are essentially moved to the side,to winter months, the minimum of activity is observed in summer. Seasonal variation of Kp-indices has only one exact spring maximum in April and some rise of activity in autumn. Magnetic activity minimum is in November-December, when aurorae activity is maximum. Seasonal variation of Wolf numerals is manifested slight ly, there is only comparatively small rise in September-October. Fig.4c shows the difference between seasonal variations in 1978 and mean values presented in Fig.4b. The curves are smoothed by trapezium formula. So that solar ac tivity in 1978 is maximum for the whole described period,* (W-W) during the whole season is more than zero. Seasonal variation of ^ II ia weakly manifested, only small rise is observed in September-November. Seasonal variation of differences for PA and Kp has approximately similar pattern and roughly presents sinusoid with maximum in April- June and with minimum in September-November, that is the activity of aurorae and mag netic field is higher than the average one in spring and in autumn - lower. Fig.5 presents annual variation of the same parameters. The pecularity of 1978 is that aurorae activity reduces at the background of vivid Kp and W rise.