[en] Results of a one-dimension time-dependent ionospheric theoretical model when experimental critical frequency of the F₂ region are used as input data are given. Evidences of the validity of the mentioned model are shown; and it is indicated that the bottom side F region described by IRI90 empirical model for Wuchang (30.5⁰N, 11.4⁰E) are well reproduced by the theoretical model for different seasons and low solar activity, meanwhile, it is shown that IRI gives values of the electron concentration in the topside larger than the model. Also, the effect of the dynamics and the photo-ionization on the variation of the height of the peak is discussed. (author). 5 refs, 8 figs