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The feasibility of using decadal changes in the geoelectric field to probe Earth's core
http://hdl.handle.net/2261/4073
http://hdl.handle.net/2261/4073c4bf3fd7-ea74-446a-af89-d4979946db62
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ShimizuPEPI04.pdf (663.2 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2010-03-15 | |||||
| タイトル | ||||||
| タイトル | The feasibility of using decadal changes in the geoelectric field to probe Earth's core | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | submarine cable voltage | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | geoelectric field | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Earth’s core | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | kinematic dynamo | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | toroidal magnetic field | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | journal article | |||||
| 著者 |
Shimizu, Hisayoshi
× Shimizu, Hisayoshi× Utada, Hisashi |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 106655 | |||||
| 姓名 | 清水, 久芳 | |||||
| 著者所属 | ||||||
| 著者所属 | 東京大学地震研究所 | |||||
| 著者所属 | ||||||
| 著者所属 | Earthquake Research Institute, University of Tokyo | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Electric field observations by using 1,000 km scale submarine cables have been performed since early 1990's. One of the main purposes of the observations is to obtain observational constraints on the dynamics of Earth’s core such as the strength and the distribution of the toroidal magnetic field and its variation at the core mantle boundary. Several constraints have been obtained until present, but the electromagnetic plausibility of them have not been examined. In this paper, electromagnetic field variations generated by a simple spherical mean- field kinematic dynamo within an electrically conducting mantle are discussed. The field variations are assumed to be generated by perturbing a steady α^2-dynamo with torsional oscillation type zonal flows having period of 30 years. It is confirmed that the kinematic dynamo can generate the observed amplitude of electric voltage variation (～100mV) naturally. The amplitude of voltage variation is controlled mainly by the energy state of the dynamo, i.e., the magnetic Reynolds numbers, and the strength of the toroidal field variation at the CMB is determined by the magnetic Reynolds numbers and the conductance of the D" layer. Potential obstacles for the detection of the 100mV signal in 1,000km scale submarine cable voltages are the electric voltages induced by external magnetic field variations (magnetotelluric induction) and that induced by the ocean flow (motional induction). Although the magnetotelluric current with decadal time scales seems negligibly small, the motionally induced electric field variation can be as much as 100mV for 1,000km scale. It is necessary to know the time variation of ocean flux in order to discuss the electric voltages generated in the deep interior of Earth correctly. | |||||
| 書誌情報 |
Physics of the earth and planetary interiors 巻 142, 号 3-4, p. 297-319, 発行日 2004-03 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00319201 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA00773963 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1016/j.pepi.2005.01.001 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 著者版フラグ | ||||||
| 値 | author | |||||
| 出版者 | ||||||
| 出版者 | Elsevier | |||||
| 関係URI | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://www.sciencedirect.com/science/journal/00319201 | |||||
