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A comparative analysis of the diurnal variations of the electron density in the altitude range of 65 to 90 km has been carried out according to the data of the partial reflections facility of the Polar Geophysical Institute, which located at the radiophysical polygon "Tumanny" (69°N; 35.7°E) and the empirical model IRI-2016. The comparison was made for the conditions of the vernal equinox (March 2017) under conditions of low geomagnetic and solar activities. As a result of the analysis, certain features that are not reproduced by the empirical model are identified in the observed daily variations of the electron concentration.