Physics of auroral phenomena : proceedings of the 35th Annual seminar, Apatity, 28 Februaru – 02 March, 2012 / [ed. board: A. G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2012. - 187 с. : ил., табл.

I. V. Mingalev et al. wind velocity in the circumpolar anticyclone of the southern hemisphere, obtained for moderate solar activity, is less than that, obtained for high solar activity. From the obtained results, we can see that, for winter period in the northern hemisphere, at levels of the mesosphere, the vertical wind velocity can have opposite directions in the horizontal domains having different configurations. Maximal absolute values of the downward vertical wind component are commensurable with the maximal module of the upward vertical wind component for conditions of moderate solar activity. On the contrary, for conditions of high solar activity, maximal absolute values of the downward and upward vertical wind components can be rather different. Simulation results, obtained for January conditions, indicate that, despite of independence of the atmospheric temperature on the 10.7-cm solar flux below approximately 100 km, the influence of the solar activity level on the global circulation of the stratosphere and mesosphere do exist. This influence is a consequence of a relationship between large-scale circulations of the middle atmosphere and thermosphere, with the thermospheric circulation being dependent on the solar activity level, undoubtedly. The influence is conditioned by the vertical transport of air from the lower thermosphere to the mesosphere and stratosphere. This transport may be rather different under distinct solar activity conditions. Conclusion The non-hydrostatic model of the global neutral wind system of the Earth’s atmosphere, developed earlier in the Polar Geophysical Institute, was utilized to investigate how solar activity affects the formation of the large-scale global circulation of the mesosphere and lower thermosphere. From the simulation results obtained, we can see that the atmospheric temperature, calculated with the help of the NRLMSISE-00 empirical model, does not depend on the 10.7-cm solar flux below approximately 100 km. Nevertheless, the effect of solar activity on the global circulation of the atmosphere below 100 km exists. This effect is conditioned by a relationship between global circulations of the thermosphere and middle atmosphere. In this relationship, a vertical motion of air can play a significant role. At altitudes of more than 100 km, the global distributions of the atmospheric temperatures, calculated for distinct 10.7-cm solar fluxes, are different. As a consequence, correspondent global circulations of the atmosphere at these altitudes are different, too, including the vertical wind system. Since the vertical wind can penetrate to low altitudes, the global circulation of the mesosphere and stratosphere may be transformed. In this way, the influence of solar activity on the global circulation of the mesosphere and stratosphere is primarily realized. Incidentally, the utilized mathematical model was able to simulate this influence due to the fact that the model is non-hydrostatic. Acknowledgments. This work was partly supported by the RFBR grant 10-01-00451. References Mingalev, I.V. and V.S. Mingalev, The global circulation model of the lower and middle atmosphere of the Earth with a given temperature distribution, Mathematical Modeling, 17(5), 24-40,2005 (in Russian). Mingalev, I.V., V.S. Mingalev, and G.I. Mingaleva, Numerical simulation of global distributions of the horizontal and vertical wind in the middle atmosphere using a given neutral gas temperature field, J. Atmos. Sol.-Terr Phys 69, 552-568,2007. Mingalev, I.V., O.V. Mingalev, and V.S. Mingalev, Model simulation of global circulation in the middle atmosphere for January conditions. Adv. Geosciences, 15, 11-16, 2008. Mingalev, I.V., V.S. Mingalev, and G.I. Mingaleva, Numerical simulation of the global neutral wind system of the Earth’s middle atmosphere for different seasons. Atmosphere, 3,213-228, 2012. Picone, J.M., A.E.Hedin, D.P. Drob, and A.C. Aikin, NRLMSISE-00 empirical model of the atmosphere: Statistical comparisons and scientific issues, J. Geophys. Res., 107A, (SIA 15) 1-16, 2002. 136