Japan Geoscience Union Meeting 2024

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[E] Poster

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

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

Thu. May 30, 2024 5:15 PM - 6:45 PM Poster Hall (Exhibition Hall 6, Makuhari Messe)

convener:Keisuke Hosokawa(Department of Communication Engineering and Informatics, University of Electro-Communications), 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)

5:15 PM - 6:45 PM

[PEM12-P12] Numerical investigation on occurrence rates of sporadic E layers in the summertime of East Asia

*Satoshi Andoh1, Akinori Saito2, Hiroyuki Shinagawa3 (1.National Institute of Information and Communications Technology, Tokyo, Japan, 2.Graduate School of Science, Kyoto University, Kyoto, Japan, 3.International Research Center for Space and Planetary Environmental Science, Kyushu University, Fukuoka, Japan)

Keywords:Ionosphere, Sporadic E layer, Mid-latitude, Simulatoin

This study investigates in detail the causes of zonal/meridional variations in occurrence rates of sporadic E layers (EsORs) in the summertime East Asia, deriving EsORs from Es simulations. Especially at mid-latitudes, EsORs are considered to be controlled dominantly by vertical ion convergence (VIC) above 100 km. However, some observations reported that zonal/meridional EsOR variations existed in East Asia during the summertime, which have not been explained in light of VIC variations. In this study, we performed Es simulations for East Asia in June-August 2017 and derived EsORs from the simulation. The simulated EsORs succeed in reproducing similar local time and spatial variations to the previously observed ones. A diagnostic analysis of Es simulations shows that phase relationships between non-migrating diurnal tides and migrating diurnal/semi-diurnal tides are crucial for EsORs. Vertical ion convergence driven by non-migrating diurnal tides below 100 km can change Es behaviors at both low- and mid-latitudes.