Japan Geoscience Union Meeting 2015

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

[P-EM27] Physics and Chemistry in the Atmosphere and Ionosphere

Tue. May 26, 2015 2:15 PM - 4:00 PM A01 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University), Takuya Tsugawa(National Institute of Information and Communications Technology), Seiji Kawamura(National Institute of Information and Communications Technology), Chair:Seiji Kawamura(National Institute of Information and Communications Technology), Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University)

2:15 PM - 2:30 PM

[PEM27-18] Seismo-traveling ionospheric disturbance observed by HF Doppler sounding system

*Min-yang CHOU1, Ho-fang TSAI1, Jann-yenq LIU2, Charles LIN1 (1.National Cheng-Kung University, 2.2Institute of Space Science, National Central University,)

Keywords:STIDs, Ionosphere

In this paper, networks and concurrent/co-located measurements of seismometers (BATS, K-net, KiK-net), HF Doppler Sounding Systems in Taiwan and Japan are used to study Seismo-traveling ionospheric disturbance (STIDs). It's shown that these infrasound wave packets triggered by seismic surface waves that was generated by strong earthquake. The infrasound wave packets were detected in the ionosphere at heights ~200 km about 9 min after the detection of corresponding wave packets on the ground. The individual wave packets recorded on the HF Doppler have different observed horizontal velocities and correspond to different type of seismic waves.
The Hilbert-Huang Transform (HHT) is applied to analyze Doppler frequency shifts (DFSs) detecting STIDs and estimated the amplification factor in vertical displacement of the ionosphere relative to the ground surface motion, while the time delay, circle, ray-tracing, and beam-forming methods are used to compute the origin of the detected STIDs.