A theoretical interpretation of ion composition measured on board the ‘Active’ satellite in the European sector during April 10-12, 1990 geomagnetic storm |
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| Authors: | M Förster V Mikhailov A Mikhailov J Smilauer |
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| Institution: | (1) Max-Planck-Institut für extraterrestrische Physik, Außenstelle Berlin, Rudower Chaussee 5, 12489 Berlin, Germany;(2) Institute for Applied Geophysics (IAG), Rostokinskaja str. 9, 129226 Moscow, Russia;(3) Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, Bocni II, 14131 Praha, Czech Republic |
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| Abstract: | Ion composition measurements on board the ACTIVE satellite during the recovery phase of a strong geomagnetic storm of 10–12 April 1990 revealed extremely high concentrations (up to 103 cm−3) of the NO+, O+2, N+2 molecular ions in the topside F2-region of the European high-latitude zone. Concentrations of O+, N+, He+, H+ light ions were slightly decreased relative to prestorm quite conditions. Theoretical calculations were used to analyze the observed variations in ion concentration. Increased neutral temperature and O2], N2] are shown to be the main reasons for the observed ion concentration variations. |
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