| 关于东亚大陆磁场的研究 |
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| 引用本文： | 任国泰.关于东亚大陆磁场的研究[J].地球物理学报,1981,24(4):404-414. |
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| 作者姓名： | 任国泰 |
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| 作者单位： | 中国科学院地球物理研究所 |
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| 摘 要： | 本文利用近三十年来的地面测量资料和东亚地区11个地磁台的资料,以及1965.0、1975.0国际地磁参考场等资料,对东亚大陆磁场的时、空变化特征进行了研究。内容包括:东亚大陆磁场的空间分布特征及场源深度的估算,东亚大陆磁场的中心位置及其磁场强度、磁场方向,近三十年来东亚大陆磁场的长期变化特征等。得到的主要结果是:1.东亚大陆磁场的中心位置近三十年来没有西向漂移的迹象,从而推断它的长期变化主要由场源强度的变化所引起,而不是主要由非偶场的西向漂移所引起;2.东亚大陆磁场的中心与它的长期变化的中心不相一致,同时,在青藏高原的东部还可能存在一弱中心。
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| 关 键 词： | 东亚大陆 长期变化 西向漂移 中心位置 偶极磁场 垂直分力 IGRF 磁场中心 地磁台 等变线 |
| 收稿时间： | 1979-10-08 |
A STUDY ON THE EASTERN ASIA CONTINENT MAGNETIC FIELD |
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| REN GUO-TAI.A STUDY ON THE EASTERN ASIA CONTINENT MAGNETIC FIELD[J].Chinese Journal of Geophysics,1981,24(4):404-414. |
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| Authors: | REN GUO-TAI |
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| Institution: | Institute of Geophysies, Academia Sinica |
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| Abstract: | This paper deals with characters of time-space variation of the eastern Asia continent magnetic field （EACMF） during last thirty years. EACMF is the non-dipole field in this region.The magnetic field intensity of EACMF at each station is the difference between the normal field and the central dipole field. The normal field is computed according to taylor polynomial （n=3）. The central dipole field is computed according to IGRF （n = 1）. We had determined the centre （1970.0） of EACMF at （?）=44°N and λ=102°E. The centre's magnetic field intensity was 17 690 γ, and the magnetic field direction was vertical down.We have studied the secular change of EACMF by the data including eleven geomagnetic observatories of this region and many repeat-survey stations near the central region of EACMF. We have found the following characters of the secular change of EACMF.a. A character of the seculer change of EACMF shows that no west-ward drift is taken place, b. The centre of the secular change of EACMF did not correspond to the centre of EACMF itself, and another weaker centre of secular change was situated under the east part of Qing Hai-Tibetan plateau region. |
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