Influences of instrument orientation error on the accuracy of daily variation of geomagnetic record
Hu Xiujuan
Li Xijing
Wang Jing
Li Xishun
Chang Guoping
Wang Xiumin
Song Zhao
Luo Na
Xie Zhen
Abstract：Based on the daily variation of geomagnetic data recorded by fluxgate magnetometer GM4-2 at Hongshan geomagnetic observatory,this paper propo-ses a method for eliminating instrument orientation error,namely the correction method for magnetic axis zero drift S 0 of D element.First,based on the mea-surement theory of magnetic axis zero drift S 0 ,a rotation platform without magnetism has been trial-produced to measure the S0 ,which is about 1 024.7 nT for the GM4-2.Then,we correct the error of S 0 value in reorientation.Finally, the S 0 value is applied to both theoretical daily variation and daily variation recorded by the instrument after orientation.The results show that the magne-tic axis zero drift S 0 of D element is the main factor for the orientation error. The daily variation recorded by the instrument after orientation are consistent with the theoretical daily variation,thus eliminating the daily variation distor-tion caused by the orientation error,and reflecting the geomagnetic filed varia-tion more realistically.
Keywords：fluxgate magnetometer GM4-2orientationthe magnetic axis zero drift S 0rotation platform without magnetism
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 130-137 )