Introduction: Some characteristics and remarks about the satellite
of CEI (Central European Initiative),called CESAR (Central European Satellite for Advanced Research) are introduced in paper presented. First of all, they are connected with the planned registration of the acceleration caused by the non-gravitational forces acting on the motion of the near-Earth satellite. The
investigation will be realised by a very sensitive microaccelerometer
(Peřestý, Sehnal, [1]). Therefore we calculated and constructed the graphs of acceleration curves for input orbital elements and for the TD88 (Total Density 1988) atmosphere model (Sehnal, [2]).
We used a non-rotating and a rotating atmosphere. We paid attention to determination of the time interval of the CESAR satellite illumination during the year 1997, which is planned for its launching. The calculation of sun-synchronous orbital elements completes the preventing considerations.
The analytical second-order theory of the motion of an arificial satellite in the Earth’s atmosphere is used to determine the satellites’ lifetime. The analytical theory is unique in the sense that it determines the secular changes of the semi-major axis and the eccentricity for a longer time-interval, characterized by the time of revolution. To establish the analytical theory, a special thermospheric model is used, which expresses directly the thermospheric total density. The theory is developed to the
second-degree in small parameters (coefficients of the density model); this enables to determine analytically the changes of the elements over an interval of several days. The gravitational effects of the Earth’s oblateness are taken into account, too. The whole theory is used for the lifetime determination of the satellite "CESAR" supposed to be launched in 1997.
The Institute of Atmospheric Physics of the ASCR organised the 4th IAGA/ICMA/CAWSES-II TG4 Workshop on Vertical Coupling in the Atmosphere-Ionosphere System, which was held from 14-18, 2011 in Prague. The Earth's atmospheric regions are intricately coupled to one another via various dynamical, chemical, and electrodynamic processes. However, the manner in which the couplings take place due to varying energy inputs from the Sun and from the lower atmosphere is a question that is yet to be understood. and Petra Koucká Knížová.