Intercomparison of TEC obtained from the IRI model to the one derived from GPS measurements Original Research Article

IRI (International Reference Ionosphere) is a well-known standard of the ionosphere, but nowadays GPS permanent observations are also the base of the regional and global ionosphere models. In this paper, comparison of TEC (Total Electron Content) derived from the IRI model to the global TEC parameters derived from GPS measurements is presented. Global TEC maps show, that GPS derived ionosphere models, in opposition to the IRI, give possibilities to investigate ionospheric response to the solar activity on the global and regional scale. The comparison results show a dynamic problem at high latitudes in IRI model.