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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

Minimum energy state and minimum angle rotation of the magnetic field in a current sheet with sheared magnetic field

http://hdl.handle.net/2261/38134
4053e151-2e3d-4d08-96d9-49d03a051f14
名前 / ファイル ライセンス アクション
JGR_A107_NA07_01143.pdf JGR_A107_NA07_01143.pdf (148.8 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2016-12-28
タイトル
タイトル Minimum energy state and minimum angle rotation of the magnetic field in a current sheet with sheared magnetic field
言語
言語 eng
キーワード
主題 current sheet
主題Scheme Other
キーワード
主題 discontinuities
主題Scheme Other
キーワード
主題 self-organization
主題Scheme Other
キーワード
主題 helicity
主題Scheme Other
キーワード
主題 force-free magnetic field
主題Scheme Other
キーワード
主題 minimum energy state
主題Scheme Other
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

WEKO 2980

Miura, Akira

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著者所属
著者所属 Department of Earth and Planetary Physics, University of Tokyo
抄録
内容記述タイプ Abstract
内容記述 In order to answer why and how “the minimum angle rotation of the magnetic field” is realized in a current sheet with a sheared magnetic field, Taylor's helicity constraint, which is valid for low-β plasmas, is applied to a one-dimensional planar current sheet with a sheared magnetic field. A single constant helicity is defined for the total rectangular volume surrounding the current sheet and is shown to be gauge-invariant. The minimization of the magnetic energy with the constraint of the constant total helicity shows that the field is described by the constant α force-free equation and that the current sheet is a special class of tangential discontinuities with a constant field strength, or a “perpendicular rotational discontinuity.” The total rotational angle of the magnetic field across the current sheet is proportional to the ratio of the total magnetic energy/helicity in the force-free state. It is proposed that among an infinite number of force-free states the current sheet relaxes into a unique force-free state with the absolute minimum ratio of energy/helicity and thus into the absolute minimum energy state for a given constant helicity. Therefore, in the relaxed state the total rotational angle of the magnetic field across the current sheet is minimum and less than 180°. Although the present study of the relaxed state is applicable only to a tangential discontinuity, a qualitative resemblance of the model prediction with observations in situ and simulations of quasi-perpendicular rotational discontinuities suggests that the observed minimum angle rotation of the magnetic field in a current sheet with a sheared magnetic field is an emergence of plasma relaxation or self-organization in space plasmas.
書誌情報 Journal of geophysical research. A

巻 107, 号 7, p. 1143, 発行日 2002-07
ISSN
収録物識別子タイプ ISSN
収録物識別子 01480227
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA10819721
DOI
関連識別子
識別子タイプ DOI
関連識別子 info:doi/10.1029/2001JA009177
権利
権利情報 copyright 2002 by the American Geophysical Union
日本十進分類法
主題 450
主題Scheme NDC
出版者
出版者 American Geophysical Union
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