日本地球惑星科学連合2015年大会

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インターナショナルセッション(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-EM09] Dynamics in magnetosphere and ionosphere

2015年5月27日(水) 18:15 〜 19:30 コンベンションホール (2F)

コンビーナ:*中野 慎也(情報・システム研究機構 統計数理研究所)、三好 由純(名古屋大学太陽地球環境研究所)、長谷川 洋(宇宙航空研究開発機構宇宙科学研究所)、田中 良昌(国立極地研究所)、堀 智昭(名古屋大学太陽地球環境研究所 ジオスペース研究センター)

18:15 〜 19:30

[PEM09-P04] Numerical simulation on electrodynamics of the pre-earthquake ionospheric anomalies

*Chuan-ping LIAN1Charles LIN1 (1.Institute of Earth Sciences, College of Sciences, National Cheng Kung University)

キーワード:earthquake precursor, ionospheric dynamics, total electron content

Over the last few decades, ionospheric observations indicate that the total electron content (TEC) often significantly decreases in afternoon on 3-5 days before the M>6.0 earthquakes. It is generally considered that electric currents driven by stressed rock flow into ionosphere. We use NRL 3D ionosphere model, SAMI3 to simulate this phenomenon, and add external current terms into current continuity equation. The range of external current distribution is 120±20oE, 30±20oN, 85~170km, and the maximum current density is 500nA/m2. Our simulation result indicates that the upward current on the bottom of ionosphere produces the maximum (minimum) variation of increasing (decreasing) ~30% (~10%) ∆TEC. The increasing ∆TEC is mainly located in west region of external current; however, the decreasing ∆TEC is mainly located on both sides of increasing region.