Japan Geoscience Union Meeting 2015

Presentation information

International Session (Oral)

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

[P-EM09] Dynamics in magnetosphere and ionosphere

Wed. May 27, 2015 4:15 PM - 5:00 PM 302 (3F)

Convener:*Shin'ya Nakano(The Institute of Statistical Mathematics), Yoshizumi Miyoshi(Solar-Terrestrial Environement Laboratory, Nagoya University), Hiroshi Hasegawa(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Yoshimasa Tanaka(National Institute of Polar Research), Tomoaki Hori(Nagoya University Solar Terrestrial Environment Laboratory Geospace Research Center), Chair:Yuki Obana(Department of Engineering Science, Faculty of Engineering, Osaka Electro-Communication University)

4:38 PM - 4:41 PM

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

3-min talk in an oral session

*Chuan-ping LIAN1, Charles LIN1 (1.Institute of Earth Sciences, College of Sciences, National Cheng Kung University)

Keywords: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.