Nonlinear triggering process of whistler-mode emissions in a homogeneous magnetic field

• 資料種別: 記事
• タイトル: Nonlinear triggering process of whistler-mode emissions in a homogeneous magnetic field
• 著者・編者: Yuya Fujiwara; Takeshi Nogi; Yoshiharu Omura
• 出版事項: 日本 : The Society of Geomagnetism and Earth, Planetary and Space Sciences
• 出版年月日等: 2022-06-18
• 出版年（W3CDTF）: 2022-06-18
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 74(95)
• 掲載巻: 74(95)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-022-01646-x; https://doi.org/10.1186/s40623-022-01646-x
• 国立国会図書館永続的識別子: info:ndljp/pid/12685382; https://dl.ndl.go.jp/pid/12685382
• コレクション（共通）: 障害者向け資料
• コレクション（障害者向け資料：レベル1）: テキストデータ
• コレクション（個別）: 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他; https://dl.ndl.go.jp/collections/B00035
• 収集根拠: オンライン資料収集制度
• 受理日（W3CDTF）: 2023-03-07T16:17:01+09:00
• 保存日（W3CDTF）: 2023-03-07
• 記録形式（IMT）: application/pdf
• オンライン閲覧公開範囲: 国立国会図書館内限定公開
• デジタル化資料送信: 図書館・個人送信対象外
• 遠隔複写可否（NDL）: 可
• 掲載誌（URI）: https://earth-planets-space.springeropen.com/articles
• 掲載誌（国立国会図書館永続的識別子）: info:ndljp/pid/12287068; https://dl.ndl.go.jp/pid/12287068
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: We perform an electromagnetic particle simulation of triggered emissions in a uniform magnetic field for understanding of nonlinear wave–particle interaction in the vicinity of the magnetic equator. A finite length of a whistler-mode triggering wave packet with a constant frequency is injected by oscillating an external current at the equator. We find that the first subpacket of triggered emissions is generated in the homogeneous magnetic field. By analyzing resonant currents and resonant electron dynamics in the simulation, we find that the formation of an electron hole in a velocity phase space results in resonant currents, and the currents cause wave amplification and frequency increase. We obtain the interaction time of counter-streaming resonant electrons in a triggering wave packet with a finite width. By changing the duration time of the triggering pulse, we evaluate the interaction time necessary for formation of an electron hole. We conduct 4 runs with different duration times of the triggering pulse, 980, 230, 105, 40 Ωe⁻¹, which correspond to cases with interaction times, 370%, 86%, 39%, and 15% of the nonlinear trapping period, respectively. We find generation of triggered emissions in the three cases of 370%, 86%, and 39%, which agrees with the conventional nonlinear model that the nonlinear transition time, which is necessary for formation of resonant currents, is about a quarter of the nonlinear trapping period.
• DOI: 10.1186/s40623-022-01646-x; https://doi.org/10.1186/s40623-022-01646-x
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: © The Author(s) 2022; This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
• 関連情報（URI）: http://hdl.handle.net/2433/276979; http://id.ndl.go.jp/digimeta/12685382; https://dl.ndl.go.jp/pid/12685382; https://link.springer.com/content/pdf/10.1186/s40623-022-01646-x.pdf; https://link.springer.com/article/10.1186/s40623-022-01646-x/fulltext.html
• 参照: A novel high accuracy finite-difference time-domain method; https://cir.nii.ac.jp/crid/1360584339757761664; Advanced numerical techniques for time integration of relativistic equations of motion for charged particles; https://cir.nii.ac.jp/crid/1360865815491498496
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: 学術機関リポジトリデータベース; https://irdb.nii.ac.jp; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; Crossref; https://www.crossref.org
• 書誌ID（NDLBibID）: 12685382; http://id.ndl.go.jp/bib/12685382