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2000年中国地磁场及其长期变化冠谐分析
引用本文:安振昌.2000年中国地磁场及其长期变化冠谐分析[J].地球物理学报,2003,46(1):68-72.
作者姓名:安振昌
作者单位:中国科学院地质与地球物理研究所,北京 100101
基金项目:国家自然科学基金重点项目 (497341 4 0 ) .
摘    要:根据1998~2000年完成的118个地磁测点 和39个地磁台的三分量绝对测量资料以及IGRF2000,计算2000年中国地磁场冠谐模型(截断 阶数为8),以及2000~2005年中国地磁长期变化冠谐模型(截断阶数为6). 球冠极位于36 °N,104°E,球冠半角为30°. 中国地磁场冠谐模型能更好地表示我国地磁场的时空变化 ,地磁场模型的均方偏差为:104.4 nT(X分量),103.3 nT(Y分量),123.9 nT(Z分量). 依据地磁场及其长期变化的冠谐模型,分别绘制2000年中国地磁图(F,X,Y,Z)和异常磁场图(ΔF,ΔX,ΔY,ΔZ),以及2000~2005年地磁长期变化图(F,X,Y,Z). 指出改善地磁场模型边界效应 的途径,并对如何布设地磁复测点提出了建议.

关 键 词:地磁场  地磁长期变化  冠谐模型  中国地磁参考场  
文章编号:0001-5733(2003)01-68-05
收稿时间:2001-11-19
修稿时间:2002-7-19

SPHERICAL CAP HARMONIC ANALYSIS OF THE GEOMAGNETIC FIELD AND ITS SECULAR VARIATION IN CHINA FOR 2000
AN ZHENCHANG.SPHERICAL CAP HARMONIC ANALYSIS OF THE GEOMAGNETIC FIELD AND ITS SECULAR VARIATION IN CHINA FOR 2000[J].Chinese Journal of Geophysics,2003,46(1):68-72.
Authors:AN ZHENCHANG
Institution:Institute of Geology and Geophysics, Chinese Academy of Sciences, Bei jing 100101,China
Abstract:According to the three component ab solute survey data of 118 geomagnetic stations observed during 1998~2000 and 39 geomagnetic observatories and IGRF 2000, the spherical cap harmonic models of t he geomagnetic field for 2000(the truncation order is 8), and the geomagnetic se cular variation for 2000~2005(the truncation oder is 6) are calculated. The pol e of the spherical cap is at 36°N and 104°E, and its half angle is 30°. The spherical cap harmonic models of the geomagnetic field and its secular variation can better express the spatial temporal variation of the geomagnetic field in China. The root mean square(RMS) deviations of the geomagnetic model are 104 .4 nT for X, 103.3 nT for Y and 123.9 nT for Z. Based on the spheric al cap harmonic models of the geomagnetic field and its secular variation, the g eomagnetic charts(F,X,Y,Z),the anomaly charts(ΔF,ΔX,ΔY,ΔZ) for 2000 and the secular variation charts(F,X,Y,Z) for 2000~2005 are drawn. The ways of improving the boundary effe ct of the geomagnetic model and arranging the repeat stations are suggested.
Keywords:Geomagnetic field  Geomagnetic secular variation  Spherical cap harmonic model  Chinese geomagnetic reference field  
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