神戸大学附属図書館デジタルアーカイブ
入力補助
English
カテゴリ
学内刊行物
ランキング
アクセスランキング
ダウンロードランキング
https://hdl.handle.net/20.500.14094/90005286
このアイテムのアクセス数:
13
件
(
2024-04-26
04:59 集計
)
閲覧可能ファイル
ファイル
フォーマット
サイズ
閲覧回数
説明
90005286 (fulltext)
pdf
13.4 MB
2
メタデータ
ファイル出力
メタデータID
90005286
アクセス権
open access
出版タイプ
Version of Record
タイトル
The dynamics of magnetic Rossby waves in spherical dynamo simulations: A signature of strong-field dynamos?
著者
Hori, Kumiko ; 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, Kumiko
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
Physics of the Earth and Planetary Interiors
巻(号)
276
ページ
68-85
出版者
Elsevier
刊行日
2018-03
公開日
2018-10-17
抄録
We investigate slow magnetic Rossby waves in convection-driven dynamos in rotating spherical shells. Quasi-geostrophic waves riding on a mean zonal flow may account for some of the geomagnetic westward drifts and have the potential to allow the toroidal field strength within the planetary fluid core to be estimated. We extend the work of Hori et al. (2015) to include a wider range of models, and perform a detailed analysis of the results. We find that a predicted dispersion relation matches well with the longitudinal drifts observed in our strong-field dynamos. We discuss the validity of our linear theory, since we also find that the nonlinear Lorentz terms influence the observed waveforms. These wave motions are excited by convective instability, which determines the preferred azimuthal wavenumbers. Studies of linear rotating magnetoconvection have suggested that slow magnetic Rossby modes emerge in the magnetostrophic regime, in which the Lorentz and Coriolis forces are in balance in the vorticity equation. We confirm this to be predominant balance for the slow waves we have detected in nonlinear dynamo systems. We also show that a completely different wave regime emerges if the magnetic field is not present. Finally we report the corresponding radial magnetic field variations observed at the surface of the shell in our simulations and discuss the detectability of these waves in the geomagnetic secular variation.
キーワード
Waves
Dynamos
Core convection
Toroidal magnetic field
Geomagnetic secular variation
カテゴリ
システム情報学研究科
学術雑誌論文
権利
©2017 The Authors. Published by Elsevier B.V.
This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
詳細を表示
資源タイプ
journal article
言語
English (英語)
ISSN
0031-9201
OPACで所蔵を検索
CiNiiで学外所蔵を検索
NCID
AA00773963
OPACで所蔵を検索
CiNiiで表示
関連情報
DOI
https://doi.org/10.1016/j.pepi.2017.07.008
ホームへ戻る