Japan Geoscience Union Meeting 2023

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[E] Online Poster

P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

Mon. May 22, 2023 10:45 AM - 12:15 PM Online Poster Zoom Room (2) (Online Poster)

convener:Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Loren Chang(Department of Space Science and Engineering, National Central University), Yue Deng(University of Texas at Arlington)


On-site poster schedule(2023/5/21 17:15-18:45)

10:45 AM - 12:15 PM

[PEM12-P18] Study of long-term variations in the sporadic E layer over Japan by using ionosonde observations

*Sorai Teraoka1, Huixin Liu1, Michi Nishioka2, Masaru Kogure1 (1.Kyushu University, 2.National Institute of Information and Communications Technology)


Keywords:Sporadic E layer

A sporadic E (Es) layer is one of the important ionospheric irregularities and disturbs wireless communications. In this study, We examine the long-term trend of Es density and occurrence by using long-term data of ionosonde observations at Japanese 4 stations, i.e., Wakkanai(45.16°N, 141.75°E, during 1948-2021), Kokubunji(35.71°N, 139.49°E, during 1957-2020), Yamagawa(31.20°N, 130.62°E, during1965-2020), Okinawa(26.68°N, 128.15°E, during972-2021). To derive their long-term trend, we apply a multiple regression method with the ionosonde data. The presentation focuses on variabilities of its occurrence frequency and intensity, and latitudinal dependence. We also show trend correlations with the background ionospheric E and F layers.