Структура и динамика полярных токовых систем : материалы международного симпозиума «Полярные геомагнитные явления», 25-31 мая, Суздаль, СССР / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т. – Апатиты : [б. и.], 1988.

looated inside the trapped region. Simultaneously there is observed decreas ing of proton fluxes especially the one along the Вmagnetic field which becomes lower than the initial level (Fig.1). During the initial intensification (until the 5-th one) the trapped boundary was located in the nearest vicinity of the satellite. As seen in Fig.1 during the initial period proton fluxes on the satellite increase simult- ateously with the first intensification started on the east that is in agree ment with the observations of other authors. Increasing of electron fluxes are lagged, it happens when the disturbed region reaches the satellite's meridian. When the intensifications occur on the satellite's meridian (the second and the 5-th intensifications marked by hollow upward arrows in Fig.1) the fluxes of protons and electrons increase simultaneously. According to the behaviour of auroras and the ionospheric currents the initial intensifications prior to tQ can be regarded belonging to the so- called active-convective phase /4/ or the micro-substorm phase /1/ which are characterized by small poleward expansion and the intensification latitude changes insignificantly. The disturbance with a large-scale surge with the localized current j * and the maximum precipitating particles gives a pure active phase of the substorm for the given case /4/. In the examined event a large auroral expansion started when the IMF B z~component was southward and the anti-convectional disturbance (classified after /1/) followed the 10-th intensification. January 23, 1979. <K =5, 23.01.19. D g^.=-60 nT). PA 5-/5°— *] 36-45fa?vJ ю 5 10 - 18.00 te.jo 19.00 и T Fig. 2. Substorm on-January 23,1979. Prior to the active phase the satellite was located outside the trapped boundary. It was a day of great activity and particle precipitations reached L=3.6. The growth phase of this substorm was marked by large fluxes of energetic particles in the magnetosphere at 6.6 Rg but they sharply decreased by the end of the phase. Usually such manife stations of energetic particles ("dropouts"), when the magnetic field stretches into the magneto- tail, are associated with earth ward movement of the trapped boun dary. Thus, prior to the active phase the satellite was located outside the trapped boundary. The first and second intensifications started with the brightening of the arc at У =62° and the pole ward auroral edge extended north ward on the satellite's meridian. In the magnetosphere these inten sifications were accompanied by simultaneous recovery and further increase of electron and proton fluxes in a wide energetic range and nearly all the pitch-angles (see the dashed section in Fig,2s the horizontal dashed 45