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Magneto-hydrodynamic Oscillations in the Earth's Core
https://doi.org/10.15083/0000034034
https://doi.org/10.15083/00000340346d92c169-f523-4ee0-9a70-bb73fc706eea
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ji0331001.pdf (1.2 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2008-05-30 | |||||
| タイトル | ||||||
| タイトル | Magneto-hydrodynamic Oscillations in the Earth's Core | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | departmental bulletin paper | |||||
| ID登録 | ||||||
| ID登録 | 10.15083/0000034034 | |||||
| ID登録タイプ | JaLC | |||||
| その他のタイトル | ||||||
| その他のタイトル | 地球核内の電磁流体振動 | |||||
| 著者 |
Rikitake, Tsuneji
× Rikitake, Tsuneji |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 132675 | |||||
| 姓名 | 力武, 常次 | |||||
| 著者所属 | ||||||
| 著者所属 | Earthquake Research Institute | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Possibilities of magneto-hydrodynamic oscillations in the earth's core are discussed in relation to the stability of Elsasser-Bullard-Takeuchi's dynamo. If there are stable magnetic fields which are caused by the dynamo-action in the earth's core, there will be oscillations of magnetic field and fluid motion around the steady state. This sort of oscillation is here studied under some simplifications. Although the study is rather crude, it is tentatively concluded that the toroidal magnetic field is not so large, otherwise the small oscillations of dynamo would not be stable. Since the fundamental equations for magnetic changes in the earth's core are obtained, we may forecast the magnitude of magnetic field of certain type, say S10-type, starting from suitable initial conditions. This is done in this paper on the basis of the spherical harmonic analyses for various epochs. Although no definite result is obtained because the observation period of the earth's magnetism seems too short for close comparison between the observation and theory, the conclusion concerning the internal magnetic field is compatible with that obtained in the stability problem. The effect of the earth's rotation as well as that of the mutual dependence of various spherical harmonics are ignored throughout this study. That sort of study will be carried out later on. | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Elsasser, Bullard,竹内等によつて研究されたように,地球核内のダイナモ作用は,現在考え得られる地磁気原因としてもつとも有力である.地球主磁場がダイナモ作用によつて維持されているという事実は,数学的表現を用いる時には,核内に於て電磁場および流体の基礎方程式が定常な解を有するということに対応する.この定常解の存在は高次の流体運動および電磁場を省略する限り確立された. | |||||
| 書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 33, 号 1, p. 1-25, 発行日 1955-06-25 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00408972 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00162258 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 453 | |||||
| 出版者 | ||||||
| 出版者 | 東京大学地震研究所 | |||||
| 出版者別名 | ||||||
| Earthquake Research Institute, University of Tokyo | ||||||
