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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

Nonideal high-β magnetohydrodynamic Kelvin-Helmholtz instability driven by the shear in the ion diamagnetic drift velocity at the subsolar magnetopause

http://hdl.handle.net/2261/38135
48e6724f-a624-4f01-801f-e35beb087261
名前 / ファイル ライセンス アクション
JGR_A108_NA02_01076.pdf JGR_A108_NA02_01076.pdf (145.5 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 Nonideal high-β magnetohydrodynamic Kelvin-Helmholtz instability driven by the shear in the ion diamagnetic drift velocity at the subsolar magnetopause
言語
言語 eng
キーワード
主題 Kelvin-Helmholtz instability
主題Scheme Other
キーワード
主題 nonideal MHD
主題Scheme Other
キーワード
主題 high-beta plasma
主題Scheme Other
キーワード
主題 ion diamagnetic drift velocity
主題Scheme Other
キーワード
主題 plasma transport
主題Scheme Other
キーワード
主題 subsolar magnetopause
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 2981

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 A nonideal magnetohydrodynamic (MHD) Kelvin-Helmholtz (K-H) instability peculiar to a high-β plasma with a nonuniform pressure is studied for the magnetosheath field due north at the subsolar magnetopause, where the ideal MHD K-H instability driven by the shear in the E × B drift velocity is not operative. This instability is driven by the shear in the ion diamagnetic drift velocity, which is a nonideal MHD drift in a high-β plasma and is a macroscopic effect not visible at the guiding center level. The two-dimensional stability (k · B0 = 0) of a model subsolar magnetopause is investigated by solving the eigenmode equation for a polygonal ion diamagnetic drift velocity profile with the density ratio across the magnetopause as a parameter. Near the subsolar magnetopause the fastest growing wave or vortex propagates duskward with a phase velocity from 8 km/s to 14 km/s, and the normalized growth rate decreases with an increase in the ratio of the magnetosheath density to the magnetospheric density. The wavelength and period of the fastest growing mode increases with the density ratio. For realistic parameters near the subsolar magnetopause the wave period becomes 750 s to 2000 s and the wavelength becomes 11000 km to 16000 km. The present K-H instability (“diamagnetically driven K-H instability”) may cause a plasma transport across the subsolar magnetopause, since the plasma motion is decoupled from that of the magnetic field owing to nonideal MHD. We discuss a possible dawn-dusk asymmetry (caused by the ion diamagnetic drift velocity at the magnetopause) of the K-H instability when the present instability is extended to the dayside magnetopause off the noon meridian, where the tailward E × B drift is no longer negligible. The vortex created by the present instability near the subsolar magnetopause has the same rotational sense as that created by the E × B shear driven K-H instability within the dusk flank boundary but has the opposite rotational sense to that created by the E × B shear driven K-H instability within the dawn flank boundary.
書誌情報 Journal of geophysical research. A

巻 108, 号 2, p. 1076, 発行日 2003-02
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/10.1029/2002JA009563
権利
権利情報 copyright 2003 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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