Full-particle simulations of instabilities in a thin current sheet of the magnetospheric system prior to substorm onset

• 資料種別: 記事
• タイトル: Full-particle simulations of instabilities in a thin current sheet of the magnetospheric system prior to substorm onset
• 著者・編者: Hirotoshi Uchino; Shinobu Machida
• 出版事項: 日本 : Springer science+business media
• 出版年月日等: 2015-10-08
• 出版年（W3CDTF）: 2015-10-08
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 67(165)
• 掲載巻: 67(165)
• 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/s40623-015-0335-7; https://doi.org/10.1186/s40623-015-0335-7
• 国立国会図書館永続的識別子: info:ndljp/pid/9534538; https://dl.ndl.go.jp/pid/9534538
• 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）: 2015-11-16T20:25:38+09:00
• 保存日（W3CDTF）: 2015-10-20
• 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://www.earth-planets-space.com/content?page=1&itemsPerPage=100
• 掲載誌（国立国会図書館永続的識別子）: info:ndljp/pid/9227920; https://dl.ndl.go.jp/pid/9227920
• 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: Substorm triggering was the focus of recent two-dimensional superposed-epoch analyses based on Geotail and THEMIS data. The results indicate that magnetic-field dipolarization at X∼-8 Re and magnetic reconnection at X∼-20 Re occur simultaneously at the onset. These results imply that there are physical mechanisms that widely affect both the dipole and current-sheet regions. The analyses also have found that a local B z enhancement appears before the substorm onset and magnetic reconnection occurs at its tailward edge. We performed four 2.5-dimensional full-particle simulations with a new initial magnetic-field structure to focus on instabilities in the magnetosphere. The structure is similar to the Earth's dipole magnetic field combined with a stretched field and current sheet on the tailward side. The simulation with the initial magnetic-field configuration shows that nodes of the magnetic field appear in the current sheet where the growth condition of tearing instability is satisfied. The features of the instability are close to those of the electron tearing mode reported in previous simulation results. Another three simulations with a local B z enhancement, as seen in the observational results, at various locations in the current sheet were performed to explore its impacts on the evolution of the instability. A relaxation process around the enhancement generates a new node at its tailward edge if its location satisfies the growth condition. The wavelength and dominant mode of the instability can be changed by the coupling between the process and tearing mode depending on the location of the enhancement. Our simulations reveal new features associated with tearing instabilities in the magnetospheric-field configuration.
• DOI: 10.1186/s40623-015-0335-7; https://doi.org/10.1186/s40623-015-0335-7
• 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: © 2015 Uchino and Machida. 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/2433/210414; http://id.ndl.go.jp/digimeta/9534538; https://dl.ndl.go.jp/pid/9534538; http://link.springer.com/content/pdf/10.1186/s40623-015-0335-7.pdf; http://link.springer.com/article/10.1186/s40623-015-0335-7/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-015-0335-7
• 参照: A synthesis of magnetospheric substorm models; https://cir.nii.ac.jp/crid/1360011142940260736; Current disruption in the Earth's magnetosphere: Observations and models; https://cir.nii.ac.jp/crid/1360011144090739584; Bursty bulk flows and dipolarization in MHD simulations of magnetotail reconnection; https://cir.nii.ac.jp/crid/1360011144855705216; Particle simulation of magnetic reconnection in the magnetotail configuration; https://cir.nii.ac.jp/crid/1360011145618900224; Linear theory of anisotropy driven modes in a Harris neutral sheet; https://cir.nii.ac.jp/crid/1360292619316243200; A state‐of‐the‐art picture of substorm‐associated evolution of the near‐Earth magnetotail obtained from superposed epoch analysis; https://cir.nii.ac.jp/crid/1360292620400701056; Statistical visualization of the Earth's magnetotail and the implied mechanism of substorm triggering based on superposed-epoch analysis of THEMIS data; https://cir.nii.ac.jp/crid/1360567190142803840; Particle simulations of collisionless reconnection in magnetotail configuration including electron dynamics; https://cir.nii.ac.jp/crid/1360855569320432384; Statistical visualization of the Earth's magnetotail based on Geotail data and the implied substorm model; https://cir.nii.ac.jp/crid/1360855570487201664; THEMIS observations of an earthward‐propagating dipolarization front; https://cir.nii.ac.jp/crid/1361137044243478784; A model for thinning of the plasma sheet; https://cir.nii.ac.jp/crid/1361137045345504512; Effect of electron dynamics on collisionless reconnection in two‐dimensional magnetotail equilibria; https://cir.nii.ac.jp/crid/1361418520798322176; The diffusion region in collisionless magnetic reconnection; https://cir.nii.ac.jp/crid/1361981468429303040; Observations of multiple X‐line structure in the Earth's magnetotail current sheet: A Cluster case study; https://cir.nii.ac.jp/crid/1361981469591664768; Magnetospheric Equilibrium Configurations and Slow Adiabatic Convection; https://cir.nii.ac.jp/crid/1361981471197111168; Transient phenomena in the magnetotail and their relation to substorms; https://cir.nii.ac.jp/crid/1362262943833847936; A theory of the substorm mechanism; https://cir.nii.ac.jp/crid/1362544419065400192; Onset of collisionless magnetic reconnection in two-dimensional current sheets and formation of dipolarization fronts; https://cir.nii.ac.jp/crid/1362825893760060544; Collisionless reconnection in two‐dimensional magnetotail equilibria; https://cir.nii.ac.jp/crid/1363107368320824576; does ion tearing exist?; https://cir.nii.ac.jp/crid/1363107369287377792; High‐speed ion flow, substorm current wedge, and multiple Pi 2 pulsations; https://cir.nii.ac.jp/crid/1363107370898416128; The development of the auroral substorm; https://cir.nii.ac.jp/crid/1363388843476685568; Instability of the current sheet in the Earth's magnetotail with normal magnetic field; https://cir.nii.ac.jp/crid/1363670318825086336; Tearing mode in thin current sheets of the Earth’s magnetosphere: A scenario of transition to unstable state; https://cir.nii.ac.jp/crid/1363670321077539200; Onset of reconnection in the near magnetotail: PIC simulations; https://cir.nii.ac.jp/crid/1363951793615889408; Neutral line model of substorms: Past results and present view; https://cir.nii.ac.jp/crid/1363951794476601472; Collisionless reconnection supported by nongyrotropic pressure effects in hybrid and particle simulations; https://cir.nii.ac.jp/crid/1364233268788136064; Geospace Environmental Modeling (GEM) Magnetic Reconnection Challenge; https://cir.nii.ac.jp/crid/1364233271274546304
• 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; 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）: 9534538; http://id.ndl.go.jp/bib/9534538