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.

It is of special interest to notice that the equatorward shift may take place at different hours in different sectors of the polar cap. In this part icular event there was a time lag of at least 20 minutes between the dawn and the dusk sectors. ACKNOWLEDGEMENTS. We greatly acknowledge G.Haerendel and W.Baumjohan of the Max-Planck Institut fur Physik und Astrophyeik, Garching bei Munchen, West Germany for supplying us with the solar wind measurements by the AMPTE- IRM satellite. R E F E R E N C E S : Akasofu S.-I. Interplanetary energy flux associated with magnetospherio substonas. - Planet.Space Sci., 27, 425-431, 1979. Danielson C. The dependence of auroral activity upon К as determined by the use of an extensive database, - Danish Met.Inst.GeophyetPapers, R-60,1980. Lassen K. Day-time aurorae observed at Godhavn 1954-56. - Det Danske Met.Inst.Medd.15, Chariottenlund, 1961. Lassen K. Geographical distribution and temporal variation of polar aurorae. - Det Danske Met.Inst.Medd.16, Charlottenlund, 1963. Lassen K. Polar cap emissions. - In: Atmospheric emissions (ed. by B.M.McCormac), Reinhold Publishing Corp., N . Y . , 63, 1969. Lassen K. On the classification of high-latitude auroras. - Geofysiske Publikasjoner, 29, 87, Universitetsforlaget, Oslo, 1972. Lassen K . , Danielsen C . , Singh V. Diffuse and discrete optical emissions at the poleward border of the morning auroral oval. - Danish Met.Inst. Geophys. Papers, R-66, 1981. Lassen K . , Danielsen C., Meng C.-I. Average configuration of the quiet auroral oval. - Danish Met.Inst.Geophys. Papers, R-73, 1986. Makita K., Meng C.-I., Akasofu S.-I. The shift of the auroral electron precipitation boundaries in the dawn-dusk sector in association with geomagn etic activity and interplanetary magnetic field. - J.Geophys.Res., 88, 7967, Makita K., Meng C.-I. Average electron precipitation patterns and visual auroi'a characteristics during geomagnetic quiescence. - J.Geophys.Res., 89. 2861 , 1984 . Makita K . , Meng C.-I., Akasofu S.-I. Temporal and spatial variations of the polar cap dimension inferred from the precipitation boundaries. - J. Geophys.Res., 90, 2744, 1985. Shepherd G.G. Dayside cleft aurora and its ionospheric effects. ~ Rev. Geophys., 17, 2017, 1979. II4