Magnetic ripples observed by Swarm satellites and their enhancement during typhoon activity

• 資料種別: 記事
• タイトル: Magnetic ripples observed by Swarm satellites and their enhancement during typhoon activity
• 著者・編者: Tadashi Aoyama; Toshihiko Iyemori; Kunihito Nakanishi
• 出版事項: 日本 : Springer Nature
• 出版年月日等: 2017-07-03
• 出版年（W3CDTF）: 2017-07-03
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 69(89)
• 掲載巻: 69(89)
• 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/s40623-017-0679-2; https://doi.org/10.1186/s40623-017-0679-2
• 国立国会図書館永続的識別子: info:ndljp/pid/10953817; https://dl.ndl.go.jp/pid/10953817
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• 受理日（W3CDTF）: 2017-09-14T21:01:06+09:00
• 保存日（W3CDTF）: 2017-09-12
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• 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: The Swarm satellites observed small-amplitude (0.1–5 nT) magnetic fluctuations perpendicular to the geomagnetic field. These so-called magnetic ripples (MRs) have a period of around a few tens of seconds along the satellite orbit in the topside ionosphere at middle and low latitudes. They are spatial structures from small-scale field-aligned currents. We investigated the following three characteristics of the MRs. First, we used Swarm observations to confirm their basic characteristics obtained from the Challenging Minisatellite Payload satellite. That is, the global distribution of the average MR amplitudes has clear geographic, seasonal, and local time dependence that is highly correlated with ionospheric conductivities. Second, we found that the average amplitudes of the MRs derived from the Swarm-B satellite, which flies at a ~50 km higher altitude, are slightly smaller than those of the Swarm-A and Swarm-C. This difference suggests that the location of the origin of MRs is below ~460 km altitude, i.e., not in the magnetosphere. Last, to provide evidence of correlation between the MRs and meteorological phenomena, we performed statistical and event analyses with typhoon track data, which are a source of acoustic and gravity waves. The data from 54 typhoons during the period from November 26, 2013, to July 31, 2016, were used for statistical analysis. The results show that the average amplitudes of the MRs during typhoon activity on the dawn, dusk, and night sides are larger than those during non-typhoon conditions. Event analyses indicate amplitude enhancements of the MRs around typhoons, and the latitude of the enhancement migrated with the typhoon. These analyses indicate that typhoon activity is correlated with MR activity and that cumulus convection activity other than typhoons may also affect MR amplitudes.
• DOI: 10.1186/s40623-017-0679-2; https://doi.org/10.1186/s40623-017-0679-2
• 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) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
• 関連情報（URI）: http://hdl.handle.net/2433/227885; http://id.ndl.go.jp/digimeta/10953817; https://dl.ndl.go.jp/pid/10953817; http://link.springer.com/content/pdf/10.1186/s40623-017-0679-2.pdf; http://link.springer.com/article/10.1186/s40623-017-0679-2/fulltext.html
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• 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; CiNii Articles; 科学研究費助成事業データベース; https://kaken.nii.ac.jp/ja
• 書誌ID（NDLBibID）: 10953817; http://id.ndl.go.jp/bib/10953817
• NII論文ID: 120006364090