Выпуск: 10 , Том: 45 , Год издания: 1993

In this paper the universal diurnal variation of foF2 is suggested to be used as the characteristic of global ionosphere condition. The method was elaborated to obtain the universal diurnal variation of foF2 by means of the Fourier series. This method allows us to use the small number of the observatories for the analysis. The possibility to distinguish the universal diurnal variation of foF2 by the described method is shown as an example for December 1988 data (the period of the International Program SUNDIAL).