Effectiveness of using correcting multipliers in calculations of the total electron content according to the IRI2007 model

A comparison of the total electron content (TEC) of the ionosphere calculated using different correcting multipliers in the IRI2007 model with experimental data indicates that this model, which is not empirical with respect to the TEC, does not adequately reflect the quantitative and qualitative features of the TEC behavior. The situation can be improved by using new empirical models of the critical frequency and equivalent thickness of the ionosphere and new methods for determining the TEC.