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.

2) the magnitude of the toroidal magnetic field associated with north- south field-aligned currents in daytime middle and low latitudes, especially in the solstitial seasons and at the time of solar flaresi 3) space current below the satellite orbit in various directions obtain able through an application of Ampere's theorem, for both quiet and disturbed days* 4) the height of eastward ring current at the bottom of westward ring current in the magnetosphere, the existence of which has been recognized earlier through the study of charged particle motion with a reasonable height- dependent density profile of ions and electrons in the geomagnetic field (Akasofu and Chapman, 1961). It will be interesting to know whether or not the eastward ring current is situated at the level of the ionosphere. It must be also emphasized here that the study of electric currents in the ionosphere and magnetosphere is most effectively carried out, if the satellite data can be compared with the ground data of various north-south magnetometer chains well distributed over the world. R E F E R E N C E S : Aggaon T.L., Heppner J.P., Maynard N.C. Observations of large magneto- spheric electric fields during the onset of a substorm. - J.Geophys.Res., 88, 3981-3990 (1983). Akasofu S.I., Chapman S. The ring current, geomagnetic disturbances, and the Van Allen radiation belts. - J.Geophys.Res., 66, 1321-1350 (1961). Araki Т., Iyemori Т., Tsunomura S., Kamei Т., Maeda H. Detection of an ionospheric current for preliminary impulse of the geomagnetic sudden commencement. - Geophys.Res.Lett.,9, 341-344 (1982). Araki Т., Iyemori Т., Kamei T. Sudden commencements observed by MAGSAT above the ionosphere. - J.Geomag.Geoelectr., 36, 507-520 (19B4a). Araki Т., Kamei Т., Iyemori T. Polar cap vertiaal currents associated with northward interplanetary magnetic field.- Geophys.Res.Lett., 11, 23-26, (1984b). Arshinkov I., Bochev A., Matviichuk Y . , Teodosiev D . , Rumchev I., Stanev 0., Nenovsky P. Small-scale magnetic disturbances in the cusp and polar cap regions. - Adv.Space Res. Vol.4, Nos.2-3, 523-526 (1984). Arshinkov I., Bochev A., Nenovsky P., Marinov P., Todorieva L. Intense current structures during low geomagnetic activity and their relation to small scale magnetic perturbations seen by the Intercosmos Bulgaria-1300. - Adv. Space Res., V.5, No.4, 127-130 (1985). Bankov L . , Bankov N., Bochev A., Kutiev I., Todorieva L . , Dubinin E. M . , Podgorny I.М., Potanin Yu.N. Suprathermal electrons in small-scale field- aligned currents. - Geophys.Res.Lett., 13, 105-108 (1986). Barfield J.N., Lin C.S., McPherron R.L. Observations of magnetic field perturbations at GOES 2 and GOES 3 during the March 22. 1979, substorms: CDAW 6 analysis. - J.Geophys.Res., 90, 1289-1295 (1985). Bochev A., Dachev T s , , 2huzgov L.N., Lazarev V.I., Tel'tsov M.V., Shkol'nikova S.I. High latitude investigations of the fluxes of charged particles and longitudinal currents by the Intercosmos-Bulgarla-1300 iono spheric etation. - Geomagn.Aeronomy, 24, 780-783 (1984). Buroh J.L., Reiff P. H . , Sugiura M. Upward electron beams measured by DE-1: A preliminary source of dayside Region-1 Birkeland currents. - Geophys. Res.Lett., 10, 753-756 (1983). Burch J.L., Reiff P.H., Menietti J.D., Heelis R . A . , Hanson W.B., Shawhan S.D., Shelley E.G., Sugiura М., Weimer D . R . , Winningham J.D. IMF By-dependent plasma flow and Birkeland currents in the dayside magnetosphere 1. Dynamic Explorer observations. - J.Geophys.Res., 90, 1577-1594 (1985). 85