Авроральные явления 70-I : материалы наблюдений Полярного геофизического института за первое полугодие 1970 г. / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т ; [отв. ред. Б. Е. Брюнелли]. - Апатиты : Кольский филиал АН СССР, 1973.

to the blackout. The magnetic field (middle line) is taken as moderate disturbed in the case 3 0 100 j. If there were no auroral activity according to the all- sky camera, photometer and spectrograph, measurements corresponding checks of the lower line remained blank. The aurora considered as moderate corresponds to the aurora with intensity coefficient by ascafilm equal to 1 , up to 3^® intensity measured by spectrograph or to the half of the auroral photometer scale. The lack of the auroral or ionosonde measurements is marked by the absence of the according region of the graphs. Only universal time is used. One can see that in the frame work of used indices ionosphere looks disturbed more often than other phenomena and its disturbances decrease more slowly, but general character at the activity distribution is similar in all three types of the observations. This fact gives an approvement to use for the analysis mainly one simpliest type of disturbances- the geomagnetic ones. Description of the typical magnetogram with a positive baj— like disturbances in the evening hours, negative ones at the night and small fluctuations or pulsations in the morning is given. The transition from the posi tive to the negative bays take place commonly at 20UT 5 at the very quiet days (such as January 25, 26, February 7,8,22) this moment of the sign changing is shifted to the 22UT, otherwise at the stormy days (for example 5 to 10 of March) fchip shifting goes to 17-16UT, and the reason of it is connected with the scale changing of the current system (Fig.3) and with its rotation due to the increase of the activity. Some ideas about the diurnal and seasonal variations of the magnetic activity and aurora are given by Fig. 4 to 9» The beginning of the year 1970 is marked by a pronounced minimum of the acti vity which corresponds to the seasonal variation, otherwise, the second part of the observed period is more enhanced than usual. Descriptions of the main storms of the first quater of the year (when aurora observation still were available) are given in the second chapter; the first one is completed by the brief description of the SSC-related phenomena. Mainly SC’s are closely followed by the enhancement of the fluctuations and the appearance of the pulsations, especially if the obser vations were made in the morning to midday sector; at the evening sector appearance of the bays is characteristic. After a number of SC observed at the spring small substorms appear immediately; in a number of the cases the beginning of the bay is marked by an appearance of the HL-2 pulsations. With the sudden commencements are connected transitions from the prolonged quiet periods to the disturbed ones. Typical example of such behaviour represented by Fig.13. XI. Description of the individual disturbances. Some individual disturbances are described in this chapter chosen by their strengh as well as by availability of the observational data. Due to the last re ason most of them belong to the local night time and the first quater of the year. Descriptions of the events are illustrated by the diagrams containing a) ionosonde data (st.Murmansk, standard f-plots)j b) jnagnetograms (st.Loparskaya, H,D and Z components redrown with the scale equalizing)! c) riometer data (st.Loparskaya, 32 MHz with a scale 10mm per db or 25 MHz with 6 mm per db)} d) photoeeter data ' 4 st.Loparskaya and st.Mirny); e) spectral data (spectra ranges: e ^—4 2 7 8 8 ., e-,— 5577 ѳ 3 - 6 ЗОО 2, e^-6789 8 )• Synoptical naps of auroras were constructed using all-sky camera data supposing that an aurora height equal to 110кж. Dotted circle restricted the region of the reliable definition of the aurora position ; the thickness of the line corresponds to the brightness of the arc. Universal time, geographic and corrected geomagnetic coordinates are shown.