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The response of the lower and upper ionosphere to the propagation of several strong typhoons in 2014–2016 has been studied using regional very-long-wave radio stations and measurements of electron density disturbances based on the satellite data of the SWARM mission in the Far East region of Russia. It is found that disturbances in the amplitude and phase of the very low frequency (VLF) signal, as well as the electron density during the active stage of typhoons, corresponds to the propagation of atmospheric internal gravity waves and their dissipation. A mechanism for the influence of internal waves on the ionosphere is proposed that makes it possible to interpret the observed variations in the phase of the VLF signal and variations in the electron density in the upper ionosphere. [ABSTRACT FROM AUTHOR]

In this paper, we studied the response of the lower and upper ionosphere to the passage of Typhoon Faxai 2019 using the regional network of ultralong-wave radio translucence stations in the Far East region of Russia and measurements of electron density perturbations using the SWARM mission satellites. The presented experimental 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 perturbations correspond to atmospheric internal gravity waves. The maximum spectral density of wave perturbations in the lower 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, is proposed. These fields projected along the geomagnetic field lines make it possible to interpret the observed variations in the phase of the ULW signal and variations in the electron density in the upper ionosphere. [ABSTRACT FROM AUTHOR]

The synchronous response of the lower and upper ionosphere to the propagation of the atmospheric Lamb wave and tsunami that were generated by the mega-eruption of the Hunga submarine volcano on January 15, 2022, has been studied for the first time using data from very low frequency radio sounding in the Far East area of Russia and the Japanese–Australian network of receivers of global navigation satellite system signals. It has been found that wave-like variations of very low frequency and global navigation satellite system signals not only appear at the intersection of radio paths by Lamb waves and tsunamis but also demonstrate nonlocal effects owing to the geomagnetic field. Such variations are caused by the action of internal gravity waves generated by these sources and the dust component of eruption on the ionosphere. The energy of the main eruption has been estimated and detected ionospheric perturbations have been interpreted. [ABSTRACT FROM AUTHOR]