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EARTHQUAKE ›› 2017, Vol. 37 ›› Issue (4): 93-101.

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Analysis of the Spatial Relative Intensity of Harmonic Components of the Main Geomagnetic Field

WU Ying-yan1,GAO Guo-ming2,YANG Jian-yuan3,ZHANG Xue-min1   

  1. 1.Institute of Earthquake Science, CEA, Beijing 100036, China;
    2.Department of Geophysics, Yunnan University, Kunming 650091, China;
    3.East Zhejiang Huadong Construction Engineering Compang, Ltd, Zhejiang Hangzhou 310014, China
  • Received:2017-01-25 Online:2017-10-20 Published:2019-08-09

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Abstract: According to the IGRF11 model, the harmonic components from 7 to 13 of the main geomagnetic field are calculated and analyzed. The result shows that, the spatial gradient of the geomagnetic elements in F, H and I exhibit a significant spatial inhomogeneity. At the China Seismic Electormagnetic satellite (CSES) altitude and within a several decades meters space, the relative variation of the geomagnetic components is estimated. Moreover, the secular variation of the main geomagnetic field is very slow. During a period of 150 years, its maximum variation is about 6 nT. Hence there will be about 0.04 nT after a period of 5 years designed life of the CSES satellite.

Key words: Spatial distribution of the main geomagnetic field, Relative intensity of the main geomagnetic field, IGRF International geomagnetic reference field model

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