Исследование стационарной магнитосферной конвекции / В. А. Сергеев [и др.] ; Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т. – Препр. ПГИ 86-05-47. - Апатиты : Кольский филиал АН СССР, 1986.

prete this feature as a spatial effect - as crossings of the boundary layer of PS (according to Eastman and Frank, 1984), which seems to exist in any conditions and, probably, maps to the source region (presumably, to a global neutral line region in the deep magnetitail). The intense varying earthward plasma flow has been found earlier at 35 in the plasma sheet by Hones et al.(1976) in the case, which may be classified as SMC (Sergeev, 1977). In general during SMC-like intervals we found a thick plasma sheet which belongs to the closed field lines. No large-scale changes (particularly, PS thinnings and significant changes in the magnetic field) similar to the substorms are found. The plasma within it is continuously energized, but the convection flow is sustained at a lov; level. A very dynamic and time-varying region is found at the outer boundaries of PS, where strong plasma flows are typical. Here we have mainly emphasized large-scale properties of the midtail plasma sheet. However, short (usually, few minutes in dur ation) burst-like features are notable in few kinds of the data, especially in magnetic and electric field measurements, as well as in the high-energy particle data (Fig.5). It does not seem to be very amusing for us since similar features have been recently found as typical features in some other conditions (including periods of low electrojet activity and different substorm phases * (see Sergeev et al., 1985). Their spatial scale, origin, and significance in the overall picture of plasma convection must be clarified in the future. 4. Ionospheric currents and particle precipitation Fig.6 gives a view of the equivalent currents and the energy flux of precipitated auroral electrons. This picture is obtained using the data from Scandinavia and Kola Peninsula regions, when they passed successively through the region of eastward A3J, the Harang discontinuity, the westward AEJ region during SMC interval 16-23 UT on Feb.19» 1978. Quite a similar current pattern is evi dent in other SMC events (see Sergeev and Vorobjev, 1979). A notable feature is the westward jet current located within 21-24 MLT (18-21 UT) at 70-72°Л . We emphasize this feature since it is a counterpart of the distinct auroral structure seen in the DMSP photoes - it is a bright auroral structure delineating the poleward edge of the auroral bulge. The study by Sergeev and 17