Авроральные явления - 76 : материалы наблюдений Полярного геофизического института за 1976 г. / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т ; [отв. ред. Б. Е. Брюнелли]. - Апатиты : Кольский филиал АН СССР, 1977.

4 AURORAL PHENOMENA - 76 The observational Data of the Polar Geophysical Institute Academy of Sciences of the USSR Editor B.E.Brunelli Apatity - 1977 The volume contains the observational data of geophysical processes over the Cola peninsula in 1976. The report continues the series started in 1970 and has the form similar to one of the previous volumes. The data are prepared by G.A.Loginov, L.T.Afanasjeva (geomagnetism), N.V.Shulgina, R.S.Kukushkina (ionosphere), L.S. Evlashin, G.V.Starkov, G.F.Totunova (auroras), 0.A.Melnikov (baloon data). The activity description was done by B.E.Brunelli and O.I.Shumilov. The volume is prepared to publication by L.V.Kovalevskaya. The report contains the data! - the magnetograms (H-component) at st.Loparskaya (in some cases - st.Lovozero); coordinates are given in Introduction, page 3 » - the hourly range (r^) tables (Loparskaya), - the graphs of riometer absorption (in dB, riometer 32 MHz, Loparskaya, antenna (50x 60°) is directed to the Polar star), - the ascaplots based on the data of all-sky C-180 camera (Loparskaya), - the main auroral emission intensity, - the time and counting rate of the baloon flights (Apatity). The universal time is used everywhere. Sometimes the midnight, sunrise and sun set are also given. The local midnight for the Cola peninsula is 22 UT. The local geomagnetic midnight corresponds to 21.01, 20.43 and 21.19 UT at equinox and near June and December solstices correspondingly. The ascaplots are presented as usuals for each half an hour interval (+ 15 min from the 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 1 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 by horizontal line over graph. In the tables of spectral lines = 4278, 5577, 6300 and 6789 X emission intensities are given in 8 class scale and also trans parence values: A - good transparency, В - partial and С - complete cloudness. A common picture of activity distribution over year is given in the Calendar (Fig.l). The activity levels on three-ball system for every hour of the year are given by the state of the ionosphere (0 corresponds to fbES ^ ^ " fc0 blackout condition - upper line), by the geomagnetic field (activity 1 corresponds to 30 < rH <C100^/, middle line) and by auroras (0 - no auroras, 2 - brightness of aurora is not less than class 2 or 3 И - lower line). The intervals when auroral or ionospheric observations were absent are excluded from the graphs. The days are put in graphs in соіишпз according to the Sun's rotations 1947--1961. The diurnal and seasonal variations of the average activity level according to the geomagnetic, ionospheric and auroral data are given in Fig. 3 and 4. Prom these variations and fi'om Calendar (Fig.1), magnetograms and ionospheric absorption it is followed that the observed activity level has a strong diurnal variation due to the varied position of the Cola peninsula with reference to the auroral oval. Besides the activity level has a more slower variation on which the daily variation is superimposed. The rather sharp increasing and more slower decreasing are typical for these variations. The days of the sharp increasings are given in Table 1. The