Spatial structure of the electromagnetic field inside the ionospheric Alfvén resonator excited by atmospheric lightning activityстатья
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Дата последнего поиска статьи во внешних источниках: 30 декабря 2020 г.
Аннотация:We have theoretically estimated ULF spectra on the ground and at ionospheric altitudes in the frequency range of the ionospheric Alfvén resonator (IAR). The IAR has been considered to be excited either by a separate lightning stroke or stochastic global thunderstorm activity. The spectra of both horizontal magnetic and electric components are shown to reveal the spectral resonant structure in the upper ionosphere. The IAR excitation for different ionospheric conditions has been compared. The IAR eigenfrequencies latitudinal inhomogeneity results in the smoothing and shift of the spectral resonance structure. The feasibility of the IAR signature detection by low-orbiting satellites with magnetic or electric sensors is discussed.