Geomagnetic secular variation in China during 2005-2010 described by IGRF-11 and its error analysis
Geomagnetic secular variation in China during 2005-2010 described by IGRF-11 and its error analysis
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发表时间：
2012
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通讯作者：
DI Chuan-zhi
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作者：
DI Chuan-zhi
第十一代国际地磁参考场（IGRF-11）是国际地磁与高层大气物理学协会（IAGA）于2009年12月发布的最新、相对精确的国际地磁参考场。根据IGRF-11模型，计算了2005-2010年中国地磁场的长期变化（SVC），SVC和SVO分别为：本文对我国34个地磁台的SVO和SVC进行了分析和比较;求出了SVO和SVC的差值和均方差σ，其均方差σ分别为0.35 ′/a和0.53 ′/a。a分别代表地磁的衰减和倾斜;地磁总强度、水平分量、北方分量、分析了2005-2010年中国地磁长期变化的IGRF-1000模型误差的原因，并对2005-2010年中国地磁长期变化的IGRF-1000模型误差进行了分析。11是中国区域和局部磁异常、国际地磁场无外源场和国际地磁场截断阶数、全球地磁台、站、址分布不均匀、地磁观测误差等，实际应用中应采用中国地磁模型（CGM），这是因为CGM比IGRF更好，能比较精确地描述中国地磁场及其长期变化。
The eleventh generation International Geomagnetic Reference Field(IGRF-11) was issued in December 2009 by the International Association of Geomagnetism and Aeronomy(IAGA).The IGRF-11 is the latest and comparatively precise IGRF.According to the IGRF-11 model,the geomagnetic secular variation(SVC) in China during 2005-2010 was calculated.The SVC and the geomagnetic secular variation(SVO) obtained from the geomagnetic data of practical observations in China are basically consistent,but there is obvious difference.The SVO and SVC at 34 observatories in China were analyzed and compared;the differences between the SVO and SVC and the mean square roots σ were obtained.The mean square roots σ are 0.35 ′/a and 0.53 ′/a for geomagnetic declination and inclination respectively;and the σ are 5.12 nT/a,8.91 nT/a,8.89 nT/a,3.27 nT/a and 3.59 nT/a for geomagnetic total intensity,horizontal component,northern component,eastern component and vertical component respectively.The reasons for the error of the geomagnetic secular variation in China during 2005-2010 described by the IGRF-11 are the regional and local magnetic anomalies in China,no external source field for the IGRF and the truncation order of the IGRF,non-homogeneous distribution of the geomagnetic observatories,stations and sites in the world,the errors of geomagnetic observations etc.The China geomagnetic model(CGM) should be used in practical application,because the CGM is better than the IGRF and can describe the geomagnetic field and its secular variation in China with comparative precision.