Preprints
https://doi.org/10.5194/gi-2020-48
https://doi.org/10.5194/gi-2020-48

  17 Dec 2020

17 Dec 2020

Review status: this preprint is currently under review for the journal GI.

Analysis of the Geomagnetic Component Z Daily Variation Amplitude Based on the China Geomagnetic Network

Xudong Zhao, Yufei He, Qi Li, and Xiaocan Liu Xudong Zhao et al.
  • Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China

Abstract. The daily variation amplitude of geomagnetic component Z is one of the important data products in Geomagnetic Network of China (GNC). It comes from the difference between maximum and minimum of the component Z recorded by the geomagnetic instrument in a day. Based on this data product, the daily variation amplitude of Z is analyzed in the past twelve years (2008–2019), including variation for each month in high and low solar activity years, seasonal variations and comparisons between the stations in Yunnan Province and in southeast China. The study indicates that the ionospheric conductivity mainly contributes to the Z daily variations amplitude in the same month or season changing along with solar activity. But the neutral wind in ionosphere could make the Z daily variations amplitude in equinox months equal to or greater than it in summer solstice months during some solar high activity years. Due to the complicated underground electrical structures in Yunnan province, the conductivity underground acts as an amplifier to make the Z daily variations amplitude increase by about 12 % ~ 41 % in Yunnan Province during equinox and summer solstice months.

Xudong Zhao et al.

 
Status: open (until 26 Feb 2021)
Status: open (until 26 Feb 2021)
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Xudong Zhao et al.

Xudong Zhao et al.

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Short summary
The daily variation amplitude of geomagnetic component Z could represent the diurnal variation strength of geomagnetic field. The ionospheric conductivity, neutral wind in ionosphere and the complicated underground electrical structures make combined action to effect the feature of the Z daily variation amplitude in China. This paper will provide the background information or reference to researchers who study the geomagnetic diurnal variation or to analyse the anomaly.