Background noise estimation of the geomagnetic signal

Yao, Xiuyi; Zhang, Suqin; Teng, Yuntian; Yang, Dongmei

doi:https://doi.org/10.5194/gi-7-189-2018

Articles | Volume 7, issue 3

https://doi.org/10.5194/gi-7-189-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gi-7-189-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 7, issue 3

Research article

|

03 Jul 2018

Research article |

| 03 Jul 2018

Background noise estimation of the geomagnetic signal

Xiuyi Yao, Suqin Zhang, Yuntian Teng, and Dongmei Yang

Supplement

https://doi.org/10.5194/gi-7-189-2018-supplement

Data sets

Geomagnetic data of observatories Geomag http://www.geomag.org.cn/

Short summary

A fast Fourier transform was applied to fit the geomagnetic diurnal variation. Fitting results showed that when the polynomial degree was greater than 160, the residual error was close to 0 nT. White noise is the main component of the residual error when the polynomial degree was greater than 160, so this method was adopted to calculate the background noise of the geomagnetic field. Spectrum analysis further demonstrated the necessity to remove background noise from geomagnetic data.