The dynamics of the poleward edge of the trough deduced using data from a meridional chain of vertical-incidence sounding stations |
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Institution: | 1. Sibizmir, 664033 Irkutsk, P.O. Box 4026, Russia;2. AANII, 199226 St-Petersburg. 38 Bering St, Russia;1. University of Rwanda - College of Science and Technology, Kigali P.O.BOX 3900, Rwanda;2. University of Rwanda, College of Education, P.O. BOX 55, Rwamagana, Rwanda;3. Indian Institute of Astrophysics, II Block, Koramangala, Bengaluru 560 034, India;4. Istituto ricerche solari Aldo e Cele Daccò (IRSOL), Università della Svizzera italiana, Locarno, Switzerland;1. Eötvös Loránd University, Budapest, Hungary;2. Research Centre for Astronomy and Earth Sciences, GGI, Hungarian Academy of Sciences, Sopron, Hungary |
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Abstract: | Data from four ionospheric stations located along the 902E meridian in the range 55–702 of corrected geomagnetic latitude, were used to construct latitude-time electron density distributions in the F2-layer peak for 17 winter nights of 1982–1983. It is concluded that under stationary convection conditions the poleward edge of the trough during the nighttime displaces only 0.5-l°/h, that is, significantly less than obtained from existing analytical models of the ionospheric trough. When the stationarity is upset (due to the development of a substorm or abrupt changes of the north-south component of the IMF), the poleward edge of the trough is observed to displace abruptly equatorward. In the substorm expansion phase these displacements can amount to 4–5° in less than an hour. Such displacements of the poleward edge in the evening hours can characterize the dynamics of the inner edge of the plasma sheet. |
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