Study of the Influence of the Solar Wind Dynamic Pressure to the Variation of Pressure in the Inner Magnetosphere.

Knowledge about the distribution of plasma pressure is crucial for evaluation of stability of any plasma configuration. The solar wind-magnetosphere interaction affects this distribution in the inner magnetosphere. In this study we used the precipitating particle flux data obtained by the Aureol-3 satellite to reconstruct the radial plasma pressure profiles in the night-side inner magnetosphere with high space and time resolution. The dynamics of these profiles has been compared with the main parameters of the solar wind, inferred from the NSSDC data base. In particular, it was found that the maximum value of the static plasma pressure in the nigh-side inner magnetosphere correlates with the value of dynamic pressure of the solar wind. The position of the maximum is also affected by the solar wind dynamic pressure, being closer to the Earth in case of high dynamic pressure. This fact is important for understanding the dynamics of geomagnetic substorms and storms.