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Attenuation of Geomagnetic Secular Veriation through the Conducting Mantle of the Earth
https://doi.org/10.15083/0000033897
https://doi.org/10.15083/0000033897f3095e9c-d18b-417e-9f7f-6c5e56da6f2d
名前 / ファイル | ライセンス | アクション |
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ji0371002.pdf (917.5 kB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-05-30 | |||||
タイトル | ||||||
タイトル | Attenuation of Geomagnetic Secular Veriation through the Conducting Mantle of the Earth | |||||
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 | 10.15083/0000033897 | |||||
ID登録タイプ | JaLC | |||||
その他のタイトル | ||||||
その他のタイトル | 地球中間層による地磁気永年変化の減衰 | |||||
著者 |
Yukutake, Takesi
× Yukutake, Takesi |
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著者別名 | ||||||
識別子 | 132199 | |||||
識別子Scheme | WEKO | |||||
姓名 | 行武, 毅 | |||||
著者所属 | ||||||
著者所属 | 東京大学大学院地球物理学課程 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | On the assumption that a time-dependent electric current sheet, at the core boundary, of which the magnetic potential is equivalent to that due to magnetic dipoles distributed at random, is the source of geomagnetic secular variations, the decrease in amplitudes of the secular variation through the mantle is discussed by taking the existence of the conducting core into account. The lower harmonic components damp out more conspicuously than the higher ones. The electrical conductivity of the mantle to cause an attenuation most compatible with that inferred from the observation ranges 4.5×10-10e.m.u.≦σ≦2.0×10-9e.m.u. at the depth of 2500km. | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 地磁気永年変化は,地球核表面を流れる電流の時間的変化によつて生ずると考えられている.磁気双極子がat randomに核表面に分布しているのと,等価な電流系を考え,その時間的変化が地表面で永年変化として観測されると仮定し,その電流系によつて地表面にできる磁気ポテンシャルが,地球中間層の電気伝導度を種々に変えることによつてどのように変化するかを求めた,中間層の電気伝導度を大きくしてゆくと,n=3迄では,低いharmonicの係数ほど,減衰度が大となり,実測より得られたポテンシャルの形にもつとも近いように,中間層の電気伝導度をきめると,2500km位の深さで4.5×1O-10e.m.u.≦σ≦2.0×10-9e.m.u.という値が得られた. | |||||
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 37, 号 1, p. 13-32, 発行日 1959-05-15 |
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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 | 453 | |||||
主題Scheme | NDC | |||||
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 |