Geomagnetic effect of the atmospheric acoustic resonance excited by earthquakes and volcano eruptions

Surkov, V.V.; Pilipenko, V.A.; Shiokawa, K.

Авторы: Surkov V.V., Pilipenko V.A., Shiokawa K.
Журнал: Journal of Geophysical Research: Space Physics
Том: 128
Год издания: 2023
Издательство: AGU Publications
Местоположение издательства: Вашингтон
Первая страница: e2023JA031872
Аннотация: An analytical model of the vertical acoustic resonance between the thermosphere and the earth'ssurface and its geomagnetic effect has been constructed. Resonance with a frequency of several mHz occurswhen an atmospheric acoustic wave (AW) is excited by vibrations of the earth or ocean surface. The derivedanalytical relationships give a possibility to examine the dependence of the fundamental resonant frequencyon the height of the reflecting atmospheric layer and horizontal AW number. Geomagnetic disturbancescaused by the impact of AW on the ionosphere are calculated within the framework of a multi-layered modelof the ground-atmosphere-ionosphere system. The E-layer of the ionosphere is treated in the approximationof a thin layer with an inclined geomagnetic field, while the topside ionosphere is assumed to consist of acold collisionless plasma. The dependence of the spectral power of magnetic perturbations on the directionof the horizontal AW propagation is examined. The magnetic perturbation spectra are shown to have maximaat frequencies close to the acoustic resonance frequency. The spectral powers of magnetic perturbationsand barometric variations measured during the Iwate-Miyagi Nairik earthquake are in accordance with themodel predictions for realistic media and AW parameters. Field-aligned currents that arise when AWs enterthe ionospheric E-layer is shown to carry measurable electromagnetic disturbances into the geomagneticallyconjugated region.
Добавил в систему: Сурков Вадим Вадимович

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Geomagnetic effect of the atmospheric acoustic resonance excited by earthquakes and volcano eruptionsстатья

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