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タイトル: Penetration of Alfvén waves into an upper stably-stratified layer excited by magnetoconvection in rotating spherical shells
著者: Takehiro, Shin-ichi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0857-3992 (unconfirmed)
著者名の別形: 竹広, 真一
キーワード: Penetration distance
Planetary fluid core
Dynamo
Geomagnetic secular variation
発行日: Apr-2015
出版者: Elsevier B.V.
誌名: Physics of the Earth and Planetary Interiors
巻: 241
開始ページ: 37
終了ページ: 43
抄録: The penetration of magneto-hydrodynamic (MHD) disturbances into an upper strongly stratified stable layer excited by magnetoconvection in rotating spherical shells is investigated. An analytic expression for the penetration distance is derived by considering perturbations of a stably stratified rotating MHD Boussinesq fluid in a semi-infinite region, with the rotation axis and a uniform magnetic field tilted relative to the gravity axis. Solutions for the response to MHD disturbances applied at the bottom boundary show that the disturbances propagate as Alfvén waves in the stable layer. Their propagation distance is proportional to the Alfvén wave speed and inversely proportion to both the arithmetic average of viscosity and magnetic diffusion and the total wavenumber of the disturbance. The derived expression for penetration distance is in good agreement with the numerical results for neutral convection in a rotating spherical shell with an upper stably stratified layer embedded in an axially uniform basic magnetic field.
著作権等: © 2015 Elsevier B.V. NOTICE: this is the author's version of a work that was accepted for publication in Physics of the Earth and Planetary Interiors. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Physics of the Earth and Planetary Interiors, 241, doi:10.1016/j.pepi.2015.02.005
This is not the published version. Please cite only the published version.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/196750
DOI(出版社版): 10.1016/j.pepi.2015.02.005
出現コレクション:学術雑誌掲載論文等

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