HFドップラーにより観測された地震に伴う電離圏変動の中性大気波動数値シミュレーションによる定量的評価

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2016/05/01

タイトル(英語): Quantitative Estimation of the Ionospheric Disturbances Associated with Earthquakes observed with HF Doppler by a Numerical Simulation of Neutral Atmospheric Waves

著者名: 吉川　晃平（千葉大学大学院工学研究科），高星　和人（千葉大学大学院工学研究科），中田　裕之（千葉大学大学院工学研究科），鷹野　敏明（千葉大学大学院工学研究科），松村　充（国立極地研究所），品川　裕之（情報通信研究機構），冨澤　一郎（電気通信大学 宇宙・電磁環境研究センター）

著者名(英語): Kouhei Yoshikawa (Graduate School of Engineering, Chiba University), Kazuto Takaboshi (Graduate School of Engineering, Chiba University), Hiroyuki Nakata (Graduate School of Engineering, Chiba University), Toshiaki Takano (Graduate School of Engineering, Chiba University), Mitsuru Matsumura (National Institute of Polar Research), Hiroyuki Shinagawa (National Institute of Information and Communications Technology), Ichiro Tomizawa (Center for Space Science and Radio Engineering, The University of Electro-Communications)

キーワード: 地震，中性大気波動，数値シミュレーション，電離圏擾乱　　earthquake，neutral atmospheric wave，numerical simulation，ionospheric disturbance

要約(英語): In order to evaluate the relationship between the coseismic ionospheric perturbations and the ground perturbations, we compare the coseismic disturbances determined by a numerical simulation with those observed by HF Doppler. HF Doppler observation determines the ionospheric vertical drift speed of the reflection point. The numerical simulation calculates the temporal evolution of the neutral acoustic wave, In this numerical simulation, the ground perturbations observed by seismometers closest to the reflection points are used as sources of the perturbations. The speed estimated from HF Doppler is about an order larger than that calculated from numerical simulation. The difference is because the speed of the ionospheric vertical drift is not same as the neutral atmospheric wave. In order to fix this difference, the ionospheric neutral drift speed is modified considering the effects of the inclination of the magnetic field and the compression of ionospheric plasma. As a result, the both speed are comparable each other.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.136 No.5 （2016） 特集：電磁界を用いた自然災害軽減のための観測・予測・解析技術

本誌掲載ページ: 259-264 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/136/5/136_259/_article/-char/ja/