ELF帯電磁波から推定した雷放電電荷量とシビア現象との関係

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): Relation between Charge Amounts of Lightning Discharges Derived from ELF Waveform Data and Severe Weather

著者名: 清水　千春（北海道大学 大学院理学院 宇宙理学専攻），佐藤　光輝（北海道大学 大学院理学院 宇宙理学専攻），本郷　保二（東北電力（株） 研究開発センター），土屋　史紀（東北大学 大学院理学研究科 惑星プラズマ・大気研究センター），高橋　幸弘（北海道大学 大学院理学院 宇宙理学専攻）

著者名(英語): Chiharu Shimizu (Department of Cosmosciences, Graduate School of Science, Hokkaido University), Mitsuteru Sato (Department of Cosmosciences, Graduate School of Science, Hokkaido University), Yasuji Hongo (Research and Development Center, Tohoku Electric Power Co., Inc.), Fuminori Tsuchiya (Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University), Yukihiro Takahashi (Department of Cosmosciences, Graduate School of Science, Hokkaido University)

キーワード: 雷放電電荷量，シビア現象，ダウンバースト　　charge amounts of lightning discharges，severe weather，downburst

要約(英語): Recently, it was shown that the shape of lightning-generated induction magnetic field waveforms in the ELF frequency range is well comparable to that of lightning current waveforms. Therefore, charge amounts of any lightning discharges occurring within the area where the induction magnetic fields are measured can be easily estimated from ELF waveforms by quantitatively evaluating the relation between ELF waveforms and the current waveforms. In this study, we analyzed lightning current waveforms measured by a Rogowski coil installed at Mt. Ogkami and ELF waveforms measured at Onagawa observatory. Based on the quantitative comparison between the ELF waveforms and the current waveforms, empirical equations that enable us to directly convert from the magnetic field intensities into the current intensities and charge amount were obtained. Furthermore, using ELF waveform data obtained at Kuju station in Kyushu and the Japan Lightning Detection Network (JLDN) lightning data, peak current values and charge amounts for the lightning discharges occurring when severe downbursts occurred in the Kanto Plain were estimated by applying the empirical equations. Then, we newly found a clear feature showing that the time variation of charge amounts drastically changed just before the downburst onset.

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: 252-258 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_252/_article/-char/ja/