地磁三分量测量中磁偏角仪器差的改正问题  

Correction Calculation on Instrument Difference of Magnetic Declination in Geomagnetic Three-component Measurement

作　　者：周思远 段颖 尤伟[1] 赵育飞 张勇[1] ZHOU Siyuan;DUAN Ying;YOU Wei;ZHAO Yufei;ZHANG Yong(Yunnan Earthquake Agency,Kunming 650201,China;Huanggang Middle School Kunming Branch,Kunming 650201,China)

机构地区：[1]云南省地震局,昆明650201 [2]黄冈中学昆明分校,昆明650201

出　　处：《华南地震》2023年第2期97-103,共7页South China Journal of Seismology

基　　金：2021年中国地震局地震监测运维项目--流动地球物理场观测(2240504)。

摘　　要：在长期的地磁三分量数据处理中忽视了每台地磁仪器本身存在的差异,并没有进行仪器差异的改正归算。为了消除不同仪器测量结果的差异,首先介绍了地磁三分量测量中总强度(F)、磁偏角(D)、磁倾角(I)的比测过程,然后根据仪器差的定义和计算过程,发现地磁场测量磁偏角仪器差的改正计算与总强度和磁倾角仪器差的改正计算不同,比测过程中计算的是磁方位角,并不是磁偏角,磁偏角测量数据需要减去仪器差,才相当于标准仪器的测量值。这一结论对于未来大量的地磁监测数据进行更精细的数据处理,具有一定的指导意义。In the long term geomagnetic three-component data processing,the differences of each geomagnetic instrument are ignored,and the correction of instrument differences are not carried out.In order to eliminate the differences between the measurements of different instruments,the comparison measurement process of total intensity(F),magnetic declination(D)and magnetic inclination(I)in geomagnetic three-component measurement is introduced firstly.Then,according to the definition of instrument difference and the calculation process,it is found that the correction calculation of instrument difference of magnetic declination in geomagnetic field measurement is different from that of instrument difference of total intensity and magnetic inclination.The magnetic azimuth angle is calculated in the comparison process,not the magnetic declination.The magnetic declination measurement data need to be subtracted from the instrument difference to be equivalent to the measurement value of the standard instrument.This conclusion has certain guiding significance for more detailed data processing of a large number of geomagnetic monitoring data in the future.

关 键 词：地磁场 磁方位角 磁偏角 比测 仪器差改正 

分 类 号：P318.21[天文地球—固体地球物理学]