Some peculiarities in the ionosphere dynamics near the ionization maximum from Irkutsk incoherent scatter radar data for low and moderate solar activities

The study deals with morphological research into dynamics of electron density in the ionosphere at altitudes of 200-400 km based on continuous series of observations at Irkutsk Incoherent Scatter Radar in 2007-2014. Daily altitude variations of average electron density for all seasons (winter, spring, summer, and autumn) and for two levels of solar activity (low and moderate) are presented. We compared our results with those of similar investigations at incoherent scatter radars such as Millstone Hill, Arecibo, EISCAT, ESR, and AMISR. Daily variations of the electron content for two altitude ranges of 180-250 and 250-600 km from data of Irkutsk Incoherent Scatter Radar and ionosonde were analyzed.