Авроральные явления - 77 : результаты работ по программе Международного года исследований магнитосферы : материалы наблюдений Полярного геофизического института за 1977 г. / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т ; [редкол.: Б. Е. Брюнелли (отв. ред.) и др.]. - Апатиты : Кольский филиал АН СССР, 1978. -

4 AURORA!, PHENOMENA - 77 The IMS - Observational Data of Polar Geophysical Institute Academy of Sciences of the USSR Editor B«,F..Brunelli Apatity - 1978 The volume contains the result.* of geophysical observations carried out at stations of Polar Geophysical Institute at Oola peninsula in 1977. The report continues the series started in 1970; since this year the data will be published in two v o l u m e s : "Auroral phenomena" with mainly weomagnetic and auroral data and "Ionospheric phenomena" wi t h f-plots, riometer and radar data. The present report contains magnetograms of H-component, the tables of hourly range (rg)i of the occux-ence of geomagnetic pulsations Pc-I, PiB and РІС, the ascaplots, the main auroral emission tables and the tables of the time and counting rate of the baloon flights.The magnetograms are as a rule from st.Loparskaya, for magnetograms from Lovozero the notice and additional scale arrow are given. The pulsations are selected according to Heacock's definition /13/. The example of the pulsations connected with a magnetic bay and the duirnal variation of their occurence according to presented tables axe given on Figs. 8 and 9« The ascaplots яге presented as usual: for each half an hour interval (+ 15 min from pointed value) aurora occurence in the northern, zenith and southern directions are given on three upper lines. To denote aurora intensity in the zenith direction more than class I two lower lines are used. Cloudness (partial or complete) is marked by dots or vertical line respectively. The time of appearance of the moon is marked b y horizontal line over the graph. The spectral lines 4 2 7 |8, 557,7, 630 and 678,9 n m emission intensities (in 8 class scale) and the transparence values (A - good transparency, В- partial and С- complete cloudness) are given in the tables. The geographical and corrected geomagnetic coordinates of the stations are given in table on page 3 • The universal time is used everywhere. Sometimes the midnight and no o n are also marked on the graphs. The local midnight for Cola peninsula is 22 UT. The local geomagnetic midnight corresponds to 21.01, 20.43 and 21.19 at equinox and ne a r June and December solstices. The yearly and monthly mean values of i \ j together with the smoothed curve of the sunspot numbers are given on Fig.I. The year belongs to the end of XX and the beginning of XXI solar cycles. The sunspot number during the second half of the year is increased, the magnetic activity nevertheless continues to decreaae. In the seasonal variation of rH the maxima at equinox are seen as well as minima at summer and winter seasons. The activity level in the middle of the year is very low, the lower values were observed only in the beginning of 1970« The general picture .of activity distribution over the year is given on the Calendar (Fig. 2 ), which contains the estimations of activity based on ionospheric, geomagnetic and auroral observations. The daily and seasonal variations of Activity according to calendar' data are given on Figs. 3 and 4. The equinoctial ma*ima and summer minima are seen on every graph, the geomagnetic activity has a mi ni mum and ionospheric - maximum in winter. The aurora occurence has the tendency to increase towards the equinox. All kinds of activity have maxima ne a r midnight, but geomagnetic one has additional maximum in summer afternoon, the H и luminosity has maximum at evening hours, whereas the emissions connected with electron aurora - at midnight. The duirnal variation of activity is clearly seen on Fi g . 2 as well. At the Fig.2 the disturbed and quiet periods are also seen, which have the tendencies to f o r m the recurrent sequences.