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Vol. 8 (2005 year), No. 1

Doronina E.N., Namgaladze A.A.
Variations of the latitude-longitudinal variations of thermospheric parameters during geomagnetic storms of 17-20 April, 2002

Study of the latitude-longitudinal variations of the Earth's thermosphere parameters depending on geomagnetic conditions has been performed by the method of mathematical modeling. Calculations have been made with use of the theoretical model of the Earth upper atmosphere (UAM) and the empirical model of the thermosphere (NRLMSISE-00). The maps of global distribution of the calculated thermospheric parameters, such as temperature of neutral gas, concentration of molecular nitrogen and atomic oxygen, the ratio of their concentrations, and also the ratio of ratio n(O)/n(N2) in the disturbed conditions to the quiet ones and the velocity of the horizontal thermospheric wind for the moments 1200 and 2400 UT on April 16, 17 and 18 have been plotted. The results show that the geomagnetic storm effects are stronger in UAM, than in MSIS: in the disturbed conditions in average the neutral temperature is 150-200 K higher.

(in Russian, стр.12, fig. 7, tables. 0, ref 19, Adobe PDF, Adobe PDF 935 Kb)

Vol. 8 (2005 year), No. 1

Doronina E.N., Namgaladze A.A., Goncharenko L.P.
Variations of thermospheric parameters above incoherent dispersion stations during geomagnetic storms of 17-19 April, 2002

Study of the geomagnetic storm influence on the Earth's thermosphere behaviour has been performed by the mathematical modelling method. Thermospheric parameters have been calculated by two ways: by solving the continuity, momentum and heat balance equations (the theoretical model UAM) and using the empirical model of the thermosphere - MSISE2000. The calculations with the UAM have been conducted in two versions with various initial conditions: in the version UAM(TM) initial conditions have been taken from the MSIS, and in the version UAM(T5) they have been taken from the quasi-steady state UAM solution obtained by 5-day model runs. The time variations of the following thermospheric parameters have been analyzed: neutral temperature, molecular nitrogen and atomic oxygen concentrations, the ratio n(O)/n(N2) and the meridional component of the thermospheric wind. The comparison of the various calculation versions has shown that the geomagnetic storm effects in the UAM are larger than in the empirical model of the thermosphere, giving better agreement with the incoherent scatter data on the ionospheric electron density.

(in Russian, стр.12, fig. 6, tables. 0, ref 25, Adobe PDF, Adobe PDF 417 Kb)