Space weather in geosynchronous orbit

We discuss the major characteristics of space weather in the geosynchronous orbit. The contributions of all the Earth radiation belts and the solar cosmic rays are estimated for this orbit. The estimation is made for solar activity cycles 22 and 23. We involve in the analysis the data obtained in the experiments on board the geostationary satellites GORIZONT and EXPRESS. It is found that sometimes the really observed electron fluxes differ by orders of magnitude from the estimations based on the models INP-91 and AE-8. We conclude that a specific model of the space weather in the geosynchronous orbit is necessary and we discuss the ways to create this model.