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52. The Westward Drift of the Geomagnetic Secular Variation
https://doi.org/10.15083/0000033415
https://doi.org/10.15083/00000334157bcb75d5-7ad1-4b5a-9637-87bd53a4392d
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ji0465004.pdf (1.8 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 | 52. The Westward Drift of the Geomagnetic Secular Variation | |||||
| 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 | 10.15083/0000033415 | |||||
| ID登録タイプ | JaLC | |||||
| その他のタイトル | ||||||
| その他のタイトル | 52.地球磁場経年変化の西方移動 | |||||
| 著者 |
Yukutake, Takesi
× Yukutake, Takesi× Tachinaka, Hiroko |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 130478 | |||||
| 姓名 | 行武, 毅 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 130479 | |||||
| 姓名 | 立中, ひろ子 | |||||
| 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 | It is shown that sufficiently reliable coefficients of spherical harmonic series for the geomagnetic secular change are obtainable by comparison of spherical harmonic coefficients of the main field for different epochs spaced at fairly long'intervals. Then the spherical harmonic coefficients of the secular change gmn and hmn are computed for the epochs 1806, 1857 and 1900, and synthesized to obtain isoporic charts of the non-dipole field. The isoporic charts thus synthesized indicate that the westward drift is the most prevailing feature of the geomagnetic secular variation, in contrast to the non-dipole anomalies most of which remain at the same position and only a few drift westwards. The result that the whole distribution of the secular change drifts westward suggests that the drifting part of the non-dipole field has global distribution as well as the standing part. It is probably due to the predominant standing anomalies which conceal most parts of the drifting anomalies that only a.few of the anomalies can be recognized to be drifting. Poleward shift of the isoporic foci was also noted, but it seems to be associated with a rapid growth of an equatorial zone where the change in the vertical force is negative.|地球磁場経年変化の解析は,固定観測所で観測された磁場の変化率をもととしてなされてきたが,理論的には主磁場解析より得られた球函数係数(gmn, hmn)の時間変化を求めても同一の結果が得られる筈である.この方法を用いて,17世紀以降の経年変化(gmn, hmn)を推定し,非双極子部分の経年変化の時間的変動を調べた. | |||||
| 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 46, 号 5, p. 1075-1102, 発行日 1968-12-20 |
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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 | ||||||
