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  1. 115 理学系研究科・理学部
  2. 06 地球惑星科学専攻
  3. 1150610 学術雑誌論文
  1. 0 資料タイプ別
  2. 10 学術雑誌論文
  3. 014 自然科学

A magnetospheric energy principle extended to include neutral atmosphere

http://hdl.handle.net/2261/43516
http://hdl.handle.net/2261/43516
df9be3cb-6233-4376-b85b-e5a981eba87a
名前 / ファイル ライセンス アクション
PHPAEN183032904_1.pdf PHPAEN183032904_1.pdf (561.2 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2017-01-06
タイトル
タイトル A magnetospheric energy principle extended to include neutral atmosphere
言語
言語 eng
キーワード
主題Scheme Other
主題 ballooning instability
キーワード
主題Scheme Other
主題 ionosphere
キーワード
主題Scheme Other
主題 magnetosphere
キーワード
主題Scheme Other
主題 plasma magnetohydrodynamics
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
著者 Miura, Akira

× Miura, Akira

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Miura, Akira

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著者別名
識別子Scheme WEKO
識別子 3207
姓名 三浦, 彰
著者所属
著者所属 Department of Earth and Planetary Science, University of Tokyo
抄録
内容記述タイプ Abstract
内容記述 The problem of ideal magnetohydrodynamic stability of plasmas in a magnetosphere-atmosphere system, in which the unperturbed magnetic field is assumed to be perpendicular to the plasma-atmosphere interface (ionospheric surface), is investigated by means of an extended magnetospheric energy principle. The derivation of the principle and conditions under which it applies to a real terrestrial magnetosphere is given. In the principle, the atmosphere is considered to be a very heavy and compressible gas with finite pressure. A thin ionospheric layer is taken into account as boundary conditions, but energetics within it are neglected. The solid-earth surface is assumed to be a perfectly conducting wall for perturbations. For a perturbation that satisfies either rigid or horizontally free boundary conditions at the plasma-atmosphere interface, the self-adjointness of the force operator is satisfied and an extended magnetospheric energy principle can be developed on the basis of the extended energy principle for fusion plasmas. These two boundary conditions are shown to be realized in the magnetosphere when the ionospheric conductivity is either very large or very small. Whereas in fusion plasmas the perturbed magnetic energy in the vacuum makes a stabilizing contribution to the potential energy, in the magnetosphere the perturbed magnetic energy in the atmosphere makes no such stabilizing contribution. This is due to the difference of the assumed field configurations of the magnetospheric and fusion plasmas. The ionospheric surface makes a destabilizing negative contribution to the potential energy owing to a horizontal plasma displacement on the spherical ionospheric surface. The method is applied to magnetospheric ballooning and interchange instabilities. The existence of a new type of magnetospheric interchange instability is shown and its structure in the magnetosphere-atmosphere system is clarified. Possible consequences of the instabilities and their relevance to magnetospheric physics are discussed.
書誌情報 Physics of plasmas

巻 18, 号 3, p. 032904, 発行日 2011-03-25
ISSN
収録物識別子タイプ ISSN
収録物識別子 1070664X
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA10987555
DOI
識別子タイプ DOI
関連識別子 info:doi/10.1063/1.3570646
権利
権利情報 © 2011 American Institute of Physics
日本十進分類法
主題Scheme NDC
主題 450
出版者
出版者 American Institute of Physics
異版である
関連タイプ isVersionOf
識別子タイプ URI
関連識別子 http://doi.org/10.1063/1.3570646
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