Wave Perturbations of the Lower and Upper Ionosphere during the 2019 Faxai Tropical Typhoon

Abstract

In this paper, we studied the response of the lower and upper ionosphere to the passage of TyphoonFaxai 2019 using the regional network of ultralong-wave radio translucence stations in the Far East region ofRussia and measurements of electron density perturbations using the SWARM mission satellites. The presentedexperimental data clearly demonstrate wave perturbations of the amplitude and phase of the ULW signal,as well as the electron density during the active stage of the typhoon. The parameters of wave perturbationscorrespond to atmospheric internal gravity waves. The maximum spectral density of wave perturbations in thelower ionosphere corresponds to 16–20 min. A mechanism for the impact of internal waves on the ionosphere,which is due to polarization fields arising from the wave motion of plasma in the lower part of the F-region, isproposed. These fields projected along the geomagnetic field lines make it possible to interpret the observedvariations in the phase of the ULW signal and variations in the electron density in the upper ionosphere