Abstract
The variations of the ionospheric current in the lower ionosphere and the plasma density of the upper ionosphere have been studied based on the monitoring of the horizontal component of the geomagnetic field induction and high-frequency sounding of the critical frequency of the ionosphere F-layer at the Moscow Observatory. It is shown that in the spectra of time variations of the geomagnetic field and the critical frequency of the F2 layer in the range of planetary waves in winter, there are both harmonics associated with solar activity and harmonics corresponding to quasi-5, 10, and 16-day planetary waves. Involvement of geomagnetic field registration data for a twenty-year time interval (from 2001 to 2020) made it possible to identify more subtle effects, namely, the harmonics associated with the modulation effect of longer-period variations and tidal effects were identified.
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