Spatial and Temporal Variation of Geomagnetic Vertical Daily Ranges in Chinese Mainland

详细信息   

• 责任者：Li Junhu (Earthquake Administration of Anhui Province ; Hefei 230031 ; China) ; Li Qi
• 刊名：Earthquake Research in China
• 出版年：2012
• 卷期：28(1)
• 关键词：地磁场 ; geomagnetic field ; 日变化 ; diurnal variations ; 中国 ; China
• 页码：p.42-50
• 图表：4 illus., 16 refs.
• 分类号：0400
• issnNo：ISSN1001-4683
• isbnNo：CN11-2008/P

摘要

In this paper, the authors analyze the daily ranges of vertical about 76 geomagnetic stations from January 1, 2008 to December 31, 2010. They use those data to study the spatial and temporal characteristics of Z ranges and the results are summarized as follows： 1） in temporal, the results show that the Z component daily ranges of all stations have an cyclical variation obviously; 2） in spatial, the daily ranges show nonlinear variation with latitude in China; 3） comparing the variation of Z daily ranges with the Sq current inversion in spatial and temporal, they find that the Sq current system causes the spatial and temporal characteristics of Z ranges; and 4）if the latitudes of the maximum amplitudes of variation of the vertical component on geomagnetic quiet days are roughly taken as the latitudes corresponding to the foei of Sq overhead current system, you can see that these latitudes of foci become higher in summer, lowest in winter and highest during Equinoxes.