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A magnetospheric energy principle extended to include neutral atmosphere
http://hdl.handle.net/2261/43516
http://hdl.handle.net/2261/43516df9be3cb-6233-4376-b85b-e5a981eba87a
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
PHPAEN183032904_1.pdf (561.2 kB)
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| 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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| 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 |
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| 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 | |||||
