华南地区地磁场长期变化特征

Characteristic analysis of secular variation of the geomagnetic field in South China

使用华南地区5个国家基准地磁台2008—2018年地磁观测数据,通过对磁偏角D、磁倾角I、总强度F、北向分量X、东向分量Y、水平分量H、垂直分量Z月均值及年变率的分析,研究该区地磁场长期变化特征。结果表明,华南地区5个地磁台近10年来七要素月均值及年变率均呈缓慢变化趋势,且变化量相当,反映了该区域地磁场长期变化的特征。

Based on the observation data of five national geomagnetic observatories in South China from 2008 to 2018,the monthly mean values and annual variation rates of seven geomagnetic elements in South China are analyzed,including declination D,inclination I,total intensity F,north component X,east component Y,horizontal component H,and vertical component Z.The results show that the monthly mean values and annual variation rates of the seven geomagnetic elements at the five geomagnetic observatories in South China show a slow and consistent variation trend in the past 10 years and the variation amounts are equivalent,which reflects the long-term variation characteristics of the regional geomagnetic field in South China.