The Two-Dimensional and Three-Dimensional Structures Concerning the Traveling Ionospheric Disturbances Over Japan Caused by Typhoon Faxai

Rui Song, Katsumi Hattori, Xuemin Zhang, Jann Yenq Liu

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

The two-dimensional concentric traveling ionospheric disturbances (TIDs) over Japan on the landfall day of Typhoon Faxai in 2019 were detected in total electron content by the ground-based Global Navigation Satellite System observations. They propagated in the radial direction away from the typhoon eye with a horizontal velocity of ∼190 m/s, a period of ∼24 min, and a horizontal wavelength of ∼180 km. Then, we systematically investigated the corresponding three-dimensional ionospheric responses for the first time. Remarkable wavelike structures of ionospheric electron density (Ne) and inverted conic-like structures concerning the disturbed Ne (dNe) were visualized in the F region. Furthermore, the descending phase progression of dNe with increasing time was detected at 220–550 km altitudes, which powerfully revealed that the typhoon-related TIDs were dominated by the upward atmospheric gravity waves (AGWs) propagating from the troposphere into the ionospheric F2 layer. By analyzing the spatial and temporal evolutions of Ne and dNe, we postulated that the transport process of neutral wind fluctuations associated with the upward AGWs were likely responsible for generating TIDs during Typhoon Faxai. In the end, the background wind velocity was estimated based on the recovered vertical wavelength of ∼460 km and the dispersion equation of AGWs. Our results also demonstrated that the weak background wind condition is essential for gravity waves propagating in the ionosphere.

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文章編號e2022JA030606
期刊Journal of Geophysical Research: Space Physics
127
發行號11
DOIs
出版狀態已出版 - 11月 2022

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