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https://hdl.handle.net/20.500.14094/90006168
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2024-04-24
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90006168 (fulltext)
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1.62 MB
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メタデータID
90006168
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open access
出版タイプ
Version of Record
タイトル
Anelastic torsional oscillations in Jupiter's metallic hydrogen region
著者
Hori, K. ; Teed, R. J. ; Jones, C. A.
著者ID
A2088
研究者ID
1000030636858
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=b3dc786e2f41976b520e17560c007669
著者名
Hori, K.
堀, 久美子
ホリ, クミコ
所属機関名
システム情報学研究科
著者名
Teed, R. J.
著者名
Jones, C. A.
収録物名
Earth and Planetary Science Letters
巻(号)
519
ページ
50-60
出版者
Elsevier B.V.
刊行日
2019-08-01
公開日
2019-07-10
抄録
We consider torsional Alfven waves which may be excited in Jupiter's metallic hydrogen region. These axisymmetric zonal flow fluctuations have previously been examined for incompressible fluids in the context of Earth's liquid iron core. Theoretical models of the deep-seated Jovian dynamo, implementing radial changes of density and electrical conductivity in the equilibrium model, have reproduced its strong, dipolar magnetic field. Analysing such models, we find anelastic torsional waves travelling perpendicular to the rotation axis in the metallic region on timescales of at least several years. Being excited by the more vigorous convection in the outer part of the dynamo region, they can propagate both inwards and outwards. When being reflected at a magnetic tangent cylinder at the transition to the molecular region, they can form standing waves. Identifying such reflections in observational data could determine the depth at which the metallic region effectively begins. Also, this may distinguish Jovian torsional waves from those in Earth's core, where observational evidence has suggested waves mainly travelling outwards from the rotation axis. These waves can transport angular momentum and possibly give rise to variations in Jupiter's rotation period of magnitude no greater than tens of milliseconds. In addition these internal disturbances could give rise to a 10% change over time in the zonal flows at a depth of 3000 km below the surface. Crown Copyright (C) 2019 Published by Elsevier B.V.
キーワード
waves
Jupiter
magnetic field
interior
zonal jets
length of day
カテゴリ
システム情報学研究科
学術雑誌論文
権利
Crown Copyright © 2019 Published by Elsevier B.V.
This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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資源タイプ
journal article
言語
English (英語)
ISSN
0012-821X
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eISSN
1385-013X
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関連情報
DOI
https://doi.org/10.1016/j.epsl.2019.04.042
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