Response of the outer ionosphere to a magnetic storm at equinox |
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| Authors: | F Jiříček J Šmilauer P Tříska L Třísková K Kudela |
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| Institution: | (1) Institute of Atmospheric Physics, Acad. Sci. Czech Republic, Prague;(2) Institute of Experimental Physics, Slovak Acad. Sci., Ko ice |
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| Abstract: | Summary The observations of the ACTIVE Project satellites in the interval of March 17–23, 1990 were analyzed for the purpose of studying the response of the outer ionosphere to the magnetic storm with SSC on March 20 at 22.43 UT. In particular, measurements of thermal plasma parameters were used, but VLF broadband measurements and data on energetic ion and electron fluxes in the range of 17.7–272 keV were also available. The results of this case study show that the observations in the morning sector at altitudes around 2000 km reflect well the state of the plasmasphere during enhanced activity, namely the depth to which the plasmasphere has been affected by enhanced magnetospheric convection. They also provide the possibility of monitoring the initial phase of recovery. The early evening observations of the plasma parameters in the outer ionosphere at altitudes of 500–1000 km indicate a distinct trough in electron concentration. In the dusk sector, the equatorward edge of this trough can be assumed to be the projection of the equatorial plasmapause. This, combined with the occurrence of electron temperature peaks and with the morning plasmapause position, enables one to judge whether the plasmaspheric bulge has formed and whether an inner plasmapause has occurred. |
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| Keywords: | Magnetic storm plasmasphere plasmapause outer ionosphere plasmatrough |
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