Frequency structure of IAR spectral bands and parameters of middle and upper ionosphere

Continuous magnetic observations of IAR emission at the mid-latitude observatory Mondy performed by search-coil magnetometer LEMI-30 in the period from March 2010 to May 2011 are analyzed and compared with results of the simultaneous ionosphere sounding. We show good correlation of diurnal and seasonal IAR frequency variations with changes in the critical frequency f
0
F
2
of the ionosphere. An attempt is made to model diurnal variation of IAR frequency calculating expected frequency scale of emission with use of IRI-2012 model. The results show good agreement with measurements, but contain systematic and random errors.