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. -

5 The daye with the activity more higher than the activity of the day before are marked on calendar and on Fig.5, which contains also the variation of equatorial D at-field and interplanetary magnetic field (Iffil signs. It is seen that on some solar rotations (Rot) IMP changes its sign many times, but я« я simplest structure one can accept 4 soetors, which are labeled on Pig.5 'bv Latin letters according to their places on rotation. Days with increased activity as a rule are accompanied bv the IMF sign changes, what allows to compare the sequences of the active days with the IMF sectors and to note the reccurrent sequences on Fig.5 bv the same labeles as IMF.On Fig.6 the days with increased activity are placed on the graph of the solar wind velocity variation /10/. In the first months of the year during Hot 1961 - 196^ IMF at the beginning of Rot changes its sign several times, but the negative field is predominant; one can consider the first part of Rot as яnegative sector. The changes of IMP вікп as я rule accompany bv the additional incrensings of activity, which on Fig.5are labeled as related to A-sector and A-sequence. The following positive В-sector is rather short, its appearance connected with the small magnetic disturbance, the following days are quiet and я sector as a whole is traced as a quiet period. The moat high activity is connected with the next negative G-sector. The disturbances start at the beginning of the sector and last gradually decreasing till its end. Inside the sector sometimes on a short time the positive field appears, which is accompanied as a rule by the activity increasings. Such days are noted on Fig.5 too. On the last Rot (1965) inside С-sector a rather long section of the positive field appears, by which the sector is divided on two parts} the activity connected with sector decreases. The most of the magnetic storms axe connected with C-sector. At the end of C-6ector the disturbances arise which can be connected with the changes of IMF sign and the passages to possible D-aector, placed near the end of rotation. The activity inside D-aector is low as well as inside В-sector, in accordance with general rule /1— 6,10,11/s the high activity during the first half of the year is connected with negative IMF, in second half - with positive. All four sequences A - D are accompanied by solar wind increasings , the increasing during negative sector is more pronounced than durina- positive one. At the middle of the year during Rot 1966 - 1967 the activity is decreased, A and С sectors on Rat 1966 are accompanied by moderate disturbances, on Rot 1967 all sectors are traced only bv very small disturbances. C-sector becomes very narrow, the high-speed flux connected with it disappearea. On the Rot 1968-1969 В-sector becomes wide, the high-speed atreames occur only in A and Вsectors, C-sector almost dis&ppeares. The activity is more higher than at previous two rotations, А-sector is the most active. At the end of the year new sequences are formed, the moat active is one connected with I>-sector. Solar wind increasings exist inside D too. The disturbances in A~sector shift on the graph! the intervals between them become more than 27 days. The disturbances at the end of the year are connected with unusual events? the proton ВЗА-event in September (aecond half of rotation 1970), and storms with very strong D st-variation in December (2.JCII and 10.XII), which are accompanied bv some phenomena typical for polar cap region. The volume is baaed on geomagnetic observations made by G.A.Loginov and L.T.Afanaejeva, auroral observations made bv L.S.Evlaehin, G.V.Starkov and G.F.Totu- nova, and Ьяіооп observations made by A . 0.Melnikov. The activity description was prepared bv BiE.Bmuielli, comments on pulsations - bv L.T.Afanaajeva. The volume is prepared to publication by L.V.Kovalevskaya.