Results of solar wind and planetary ionosphere research using radiophysical methods

Abstract

The magnetic field created by this antenna was measuredat the distance 1200 km from the transmitter, in the Bare-ntsburg Observatory, by a three-component inductionmagnetometer. The radiation experiments were conductedwithin a few days, mostly at night, when the IAR formationprobability is high.Themainresultoftheseexperimentsisthatinanumberofcases, a nonmonotonic dependence of the received signal onthe frequency was detected for the horizontal magnetic fieldcomponent(Fig.5b,c).WebelievethatthisisduetotheIARinfluenceonthepropagatingsignal,becausetheschemeoftheexperimentallowedinvestigatingthefieldintheregionwithasignificant contribution of the wave propagating in the outerwaveguide (above the F-layer) to the total field.Wealsoestimatedtheeffectivenessofvariousionosphericmodels for interpretation of the results of the conductedmeasurements. We showed that the results of the interna-tional reference ionosphere (IRI) model calculations agreepoorly with the experimental data. The upper atmospheremodel (UAM) calculations better correspond to the experi-ment,buttheyarealsoimperfect.Theresultsofexperimentalionospheric studies (such as satellite tomography) should beused to refine the ionospheric characteristics obtained bymodel calculations.