| 我国及邻近地区地磁场的矩谐分析 |
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| 引用本文： | 徐文耀,朱岗昆.我国及邻近地区地磁场的矩谐分析[J].地球物理学报,1984,27(6):511-522. |
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| 作者姓名： | 徐文耀 朱岗昆 |
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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： | 本文从高斯位理论出发,得到了包含内源场和外源场的局部地区地磁场矩谐级数表达式,指出了局部地区地磁场内、外源部分分离的可能性。对中国及邻近地区1970.0年地磁场的矩谐分析结果表明:在北纬10°-45°之间有一个垂直分量的负异常带,异常中心在西藏高原和太平洋西部,最大异常值分别达到-330γ和-460γ;北向分量的正异常区从北纬23°一直伸展到北纬55°以北,极大值约在北纬40°附近,极值达300γ;东向分量在整个区域呈现微弱的正异常。本文对与矩谐分析有关的截断水平、光滑处理以及误差分析等问题也进行了讨论。
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| 关 键 词： | 矩谐分析 截断水平 地磁场 中国及邻近地区 外源场 光滑处理 球谐分析 磁场分布 磁位 球谐级数 |
| 收稿时间： | 1983-12-10 |
A STUDY OF THE RHA FOR THE GEOMAGNETIC FIELD OF CHINA AND NEIGHBOURING REGION |
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| XU WEN-YAO,TSCHU KANG-KUN.A STUDY OF THE RHA FOR THE GEOMAGNETIC FIELD OF CHINA AND NEIGHBOURING REGION[J].Chinese Journal of Geophysics,1984,27(6):511-522. |
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| Authors: | XU WEN-YAO TSCHU KANG-KUN |
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| Institution: | Institute of Geophysics, Academia Stnica |
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| Abstract: | In this paper an expression of rectangular series has been obtained for representing both internal and external parts of a regional geomagnetic field. It is possible to separate these two parts by use of Rectangular Harmonic, Analysis （RHA）. As an example, RHA has been applied to the geomagnetic field of China and neighbouring region. Our results show that:1. A negative anomaly in vertical component Z occurs between 10°N and 45°N latitudes with the extrema of -330γ at Xizang （Tibet） and of -460γ at west Pacific Ocean. 2. A positive anomaly of northward component X with the maximum of 300γ at 40°N occupies the area northward from 23°N. 3. Eastward component T shows weak positive anomaly in the studied region. Some discussions are made about truncation level, smoothing procedure and error estimation. |
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