Studying frequency dispersion in transionospheric radio paths using the estimates of the total electron content

The paper presents the findings of the research into the effects of frequency dispersion in transionospheric radio channels. We discussed the general framework of the theory of frequency dispersion of the phase taper. The equations for the coherence band of the wideband channels and the critical value of the total electronic content (TEC) were obtained. The experimental results of daily variations and critical TEC values for the mid-latitude ionosphere are presented.