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The paper deals with the comparison of observations by the Irkutsk incoherent scatter radar (ISR) during the period of 1998–2003 with predictions of the International Reference Ionosphere model, IRI-2001. For the comparison, we used data for only magnetically calm days (K p ⩽4). Our study showed: (1) good agreement between IRI and ISR data during the equinoxes for the electron density N ...