ULF Electromagnetic Field in the Upper Ionosphere Excited by Lightning

Mazur, N.G.; Fedorov, E.N.; Pilipenko, V.A.; Vakhnina, V.V.

Авторы: Mazur N.G., Fedorov E.N., Pilipenko V.A., Vakhnina V.V.
Журнал: Journal of Geophysical Research: Space Physics
Том: 123
Номер: 8
Год издания: 2018
Издательство: AGU Publications
Местоположение издательства: Вашингтон
Первая страница: 6692
Последняя страница: 6702
DOI: 10.1029/2018ja025622
Аннотация: We examine excitation of ultralow frequency (ULF) electromagnetic waves by an atmospheric lightning stroke in the upper ionosphere and the role of the ionospheric Alfvén resonator (IAR) in this process. We have theoretically calculated with the developed numerical model the spatial and spectral structures of electromagnetic disturbance in the ULF frequency range 0.1–6.0 Hz excited by an atmospheric lightning stroke on the ground and at ionospheric altitudes. The frequency band under consideration comprises typical frequencies of the IAR and the ionospheric waveguide. The spectra of horizontal magnetic and electric components reveal a spectral multiband structure in the upper ionosphere. The form of spectra depends significantly on the horizontal distance \rho from the source: spectral peaks associated with the IAR are evident at \rho ≤ 400 km, whereas at \rho ≥ 1000 km the spectral peaks (>4 Hz) corresponding to the ionospheric waveguide modes can be seen. The model predicts that a vertical electric discharge with the charge moment M_Q = 10^6 C⋅m produces at altitude 500 km and \rho = 40 km a pulse with electric and magnetic amplitudes of about 4 mV/m and 4 nT, correspondingly, and duration ∼ 0.2 s. The pulse amplitude decays rather slowly with distance ∝ \rho^{−1}. Detection of ULF response in the upper ionosphere to isolated intense lightning stroke by low-orbiting satellites with magnetic or electric sensors onboard is quite feasible.
Добавил в систему: Мазур Николай Григорьевич

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ULF Electromagnetic Field in the Upper Ionosphere Excited by Lightningстатья

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