日本地球惑星科学連合2022年大会

講演情報

[E] 口頭発表

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-EM13] Coupling Processes in the Atmosphere-Ionosphere System

2022年5月24日(火) 13:45 〜 15:15 302 (幕張メッセ国際会議場)

コンビーナ:Huixin Liu(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)、コンビーナ: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)、コンビーナ:Deng Yue(University of Texas at Arlington)、座長:大塚 雄一(名古屋大学宇宙地球環境研究所)、新堀 淳樹(名古屋大学宇宙地球環境研究所)、江尻 省(国立極地研究所)


14:15 〜 14:30

[PEM13-03] Numerical studies on 3D dynamics of the sporadic E layers at the geomagnetic mid-latitudes

★Invited Papers

*安藤 慧1齊藤 昭則1品川 裕之2江尻 省3,4 (1.京都大学大学院 理学研究科、2.国立研究開発法人情報通信研究機構、3.国立極地研究所、4.総合研究大学院大学)


キーワード:スポラディックE層、電離圏、シミュレーション

A 3D ionospheric model has been developed to elucidate 3D dynamics of the sporadic E layers (EsLs) at the geomagnetic mid-latitudes. The EsLs are highly dense plasma layers, appearing in the ionospheric E region. They consist mainly of metal ions such as Fe+, Mg+ and Ca+. The wind shear theory is widely accepted as the EsL formation mechanism. According to the theory, the EsLs are formed by the vertical shears of the horizontal winds. This theory can explain vertical dynamics of the EsLs, but not horizontal dynamics. Till now, it has been unclear how the EsLs evolve horizontally and how the horizontal Es dynamics is observed by the traditional 1D observations such ionosondes, radars, and lidars. Recently, we developed a 3D ionospheric numerical model coupled with the realistic neutral winds of a whole atmospheric model. The numerical model generally succeeded in reproducing the day-to-day variations of the EsLs around Japan and Arecibo. Moreover, our 3D ionospheric model revealed the 3D EsL dynamics. For example, the EsLs lag behind the wind shear nodes as descending due to the frequent ion-neutral collisions; the local time dependence of the horizontal EsL movements differs between descending and stagnating EsLs. In this presentation, we will review our recent studies of the 3D EsL dynamics and morphology using the newly developed 3D ionospheric model. Physical mechanisms of the day-to-day variations and horizontal movements of the EsLs will be discussed.