中国地区地磁长期变化研究  

Study of geomagnetic secular variation in China

作　　者：陈斌[1] 顾左文[1] 高金田[1] 袁洁浩[1] 狄传芝[1] 

机构地区：[1]中国地震局地球物理研究所,北京100081

出　　处：《地球物理学报》2010年第9期2144-2154,共11页Chinese Journal of Geophysics

基　　金：地震行业科研专项"地震与构造活动重点监视区地磁基本场动态模型研究"(200708011);中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项"岩石圈磁场异常与地震活动性关系的观测与研究"联合资助

摘　　要：采用2000～2004年中国地区34个台站的地磁日均值数据,计算了通口和静日的平均年变率,以及静日的拟合年变率.应用上述年变率,建立了2000.0～2005.0年代中国地区地磁场长期变化泰勒多项式模型和曲面样条模型.分析讨论了该泰勒多项式模型和曲面样条模型与国际地磁参考场长期变化模型(IGRF-SV)的异同,结果表明,中国地区地磁长期变化的泰勒多项式模型与曲面样条模型的形态与数值是一致的,而且与IGRF-SV长期变化的趋势也是一致的,但中国地区地磁长期变化具有区域特征.Using the data of the geomagnetic diurnal means during 2000-2004 at 34 observatories in China, we calculated the mean annual change rates on the quiet days and all days, and the fitting annual change rates on the quiet days. The Taylor polynomial model and the spline model of the geomagnetic secular variation in China for epoch 2000.0-2005.0 were established, based on the above annual change rates. The similarity and difference between the Taylor polynomial model, the spline model and the secular variation model of International Geomagnetic Reference Field （IGRF-SV） were analyzed and discussed. The results show that the shape and the value of the Taylor polynomial model and the spline model for the geomagnetic secular variation in China are quite consistent, and their long-term trends are also consistent with IGRF-SV. However, the geomagnetic secular variation in China has some regional characteristics.

关 键 词：地磁长期变化 国际地磁参考场(IGRF) 泰勒多项式 曲面样条模型 中国地区 

分 类 号：P318[天文地球—固体地球物理学]