Abstract
A self-consistent numerical global model of the coupled thermosphere, ionosphere and protonosphere (GSM TIP) has been used to examine the variations of the upper atmospheric parameters with respect to the changes of the solar extreme ultraviolet/ultraviolet (EUV/UV) flux from solar minimum to solar maximum conditions. Two model runs were executed for equinox and quiet geomagnetic periods for the same initial conditions. In the first case for the given UV flux the amplitude of the EUV flux was changed, whereas in the second case the UV flux was increased at a constant level of the EUV flux. For these cases only the global dynamical structure of the thermosphere has been studied. The model results have shown that in the first case the diurnal mode of the neutral wind increased at an altitude of 300 km and the semidiurnal mode increased at 120 km. In the second case the variation of the neutral wind circulation was opposite. Amplitudes of the variation were 15 m/s at 300 km and 5 m/s at 120 km.
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