日本地球惑星科学連合2023年大会

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

2023年5月21日(日) 15:30 〜 16:45 101 (幕張メッセ国際会議場)

コンビーナ: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)、Yue Deng(University of Texas at Arlington)、Chairperson:Yosuke Yamazaki(Leibniz Institute of Atmospheric Physics)、齊藤 昭則(京都大学大学院理学研究科地球物理学教室)


16:30 〜 16:45

[PEM12-20] Three-dimensional Simulation of Equatorial Spread F: Effects of Field-aligned Plasma Flow and Ionospheric Conductivity

*Zezhong Li1,2Jiuhou Lei1、Binzheng Zhang3Tatsuhiro Yokoyama2 (1.School of Earth and Space Sciences, University of Science and Technology of China、2.Research Institute for Sustainable Humanosphere, Kyoto University、3.Department of Earth Sciences, The University of Hong Kong)



キーワード:equatorial spread-F (ESF), equatorial plasma bubbles (EPB), numerical simulation, ionospheric conductivity, field-aligned plasma flow

Recently a Three-dimensional EquatoriaL spread F (TELF) model using high-resolving power advection schemes has been developed. With the inclusion of the field-aligned plasma flow and realistic ionospheric conductivity configuration, the TELF model reproduced typical features of the observed ESF phenomena, including plasma depletions along flux tubes, geomagnetic conjugate irregularities, and ESF morphology as seen in ground optical and satellite observations. Through control simulations, the effects of field-aligned plasma flow and ionospheric conductivity on ESF are investigated. It is found that field-aligned plasma flow could inhibit the growth of bubbles by modulating the ionospheric conductivity distribution along field lines, and the TELF model is more appropriate for simulating topside bubbles due to a more reasonable ionospheric conductivity configuration compared to the two-dimensional model. Additionally, the simulations demonstrate that the amplitude and altitude of the initial perturbations can also affect the growth rate of ESF by modulating the polarization electric fields.