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Vol. 1 (1998 year), No. 2

Namgaladze A.A., Martynenko O.V., Volkov M.A., Namgaladze A.N., Yurik R.Yu.
High-latitude version of the global numerical model of the Earth's upper atmosphere

The global numerical model describing the thermosphere, ionosphere and protonosphere of the Earth as a single system has been modified for the polar upper atmosphere studies. The spatial and time resolution of the model has been significantly enhanced by the use of the variable latitudinal steps of numerical integration. The model is being developed to encompass modelling of the inner part of the magnetosphere confined by the closed geomagnetic field lines and the mesosphere. The results of the model calculations for the quiet magnetic conditions have been compared with the data of the empirical ionospheric and thermospheric models as well as with the EISCAT data and, in general, reasonable agreement between theoretical and empirical data has been found. The new high-latitude version of the model has been applied as well to the investigations of the disturbed behaviour of the Earth’s upper atmosphere during geomagnetic substorms and storms and during disturbances in the cusp region. The physical mechanisms of the upper atmosphere responses to the solar wind and magnetospheric forcings have been understood by the use of the model in several case studies.

(in English, стр.62, fig. 44, tables. 0, ref 145, MS Word 95, MS Word 95 956 Kb)

Vol. 8 (2005 year), No. 1

Yurik R.Yu., Namgaladze A.A.
Research of the thermospheric-ionospheric interaction in the disturbed conditions by the example of the magnetic storm of 3-4 April, 1979

Recent numerical results of the upper atmosphere storm modeling have been presented for the strong magnetic storm of 3-4 April 1979 at the high solar activity level. The results have been obtained using the global time-dependent three-dimensional numerical Upper Atmosphere Model (UAM). The cross-polar cap electric potential, the precipitating electron fluxes, and the positions of the auroral oval boundaries have been used as storm-time model input parameters. The time variation of the calculated disturbances along the midday and midnight geomagnetic meridians of the thermospheric parameters at the height 350 km as well as those of the electron number density at the peak of F2-layer have been shown. The role of the electromagnetic plasma drift and thermospheric composition and wind disturbances on the storm-time ionosphere and thermosphere behaviour is discussed. A comparison of the calculated and observed neutral mass density and ionospheric F2-layer critical frequency latitudinal variations demonstrates a good agreement between the model and experimental data.

(in Russian, стр.14, fig. 9, tables. 1, ref 21, Adobe PDF, Adobe PDF 1300 Kb)