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.

place when K p > 2 and thus they belong-to aubatorma usually manifesting them selves on the geostationary orbit at night-time /2/. Besides in all the events the time t Q corresponds to the start of a large (an amplitude ~ 100 nT and duration 10-15 min) variation of the D-component magnetic recordings on the ground. It was supposed that such +D-variation in most cases typical for the westward travelling surge /3/ can be an indicator of appearance or 3harp intensification of the upward FAC. The symbol t^ stands for the moment of the WTS passing the satellite's meridian and the D- component sharply decreases. This indirect indication of the FAC was used to distinguish spatial variation of the magnetic field and particle fluxes in the magnetosphere in different longitudinal sectors of the auroral bulge. Event on March 6. 1979 (K =4, Ва^ =-30 n T ). Fig. gives the data of all- is marked by an sky cameras at Ivalo station (the projection of GEOS asterisk). The satellite data are placed below: integral fluxes of energetic electrons (^"20 keV) and protons ( ^ 27 keV) and three components of the magnetio field. Short hollow arrows mark the direction of expansion of the disturbed region toward the satellite's meridian (the arrow faces to the left if it comes from the east, the upward arrow shows the intensification on the satellite's meridian). During the first four inten sifications (averaged interval between them is 11 min) the west ward electrojet is intensified insignificantly, the arcs were oriented along the parallel. Between the intensifications auroras are shifted to the pole by ~ 1° along the latitude (see Fig.1 the dashed line on the auroral map), though brighteniree of the arcs at the onset of intensifications occured almost on the same latitude. During this period the magnetic field on the satellite changed insigni ficantly, mainly in the form of oscillations or 3low and small increases of the H-component (Fig.1). The period of currents maximum intensity starts after the 6-th intensif ication at the moment t when a large variation of the D-component develops (the interval between the intensification decreases up to 6 min). At the beginning of the eightth intensification over the Kola peninsula there appeared a WTS with the upward FAC j* . The surge passes the satellite's meridian at about t^ when a sharp decrease of the D-component starts at Tromso. Just at this time a rapid dipclarization of the magnetic field occurs on the satellite and the electron fluxes grow. The satellite turns out to be Fig,1. Substorm on March 6, 1979. The satellite data: integral fluxes of electrons and protons and the magnetic field. 44