Numerical investigation on occurrence rates of sporadic E layers in the summertime of East Asia

安藤 慧; 齊藤 昭則; 品川 裕之

講演情報

[E] ポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

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

2024年5月30日(木) 17:15 〜 18:45 ポスター会場 (幕張メッセ国際展示場 6ホール)

コンビーナ:細川敬祐(電気通信大学大学院情報理工学研究科)、Liu Huixin(九州大学理学研究院地球惑星科学専攻九州大学宙空環境研究センター)、大塚雄一(名古屋大学宇宙地球環境研究所)、Chang Loren(Institute of Space Science, National Central University)

17:15 〜 18:45

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

*安藤慧¹、齊藤昭則²、品川裕之³ (1.国立研究開発法人情報通信研究機構、2.京都大学大学院理学研究科、3.九州大学国際宇宙惑星環境研究センター)

キーワード：電離圏、スポラディックE層、中緯度、シミュレーション

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.