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  • 标题:Annual and semi-annual variations of the geomagnetic field components analysed by the multi-taper method
  • 其他标题:Annual and semi-annual variations of the geomagnetic field components analysed by the multi-taper method
  • 本地全文:下载
  • 作者:I. Wardinski ; M. Mandea
  • 期刊名称:Earth, Planets and Space
  • 电子版ISSN:1880-5981
  • 出版年度:2006
  • 卷号:58
  • 期号:6
  • 页码:785-791
  • DOI:10.1186/BF03351982
  • 出版社:Springer Verlag
  • 摘要:Monthly means of three geomagnetic components ( X -northern, Y -eastern and Z -vertical downward) from 154 observatories over the interval 1960-2002 have been analysed to determine the annual and semi-annual variations. The method applied is a multi-taper analysis, which gives a robust estimate of the power spectral density of the temporal variation of the field components. The main objective is to investigate the geographic dependence of the annual and semi-annual variations. Surprisingly, these variations in the vertical downward component are not homogeneously distributed all over the globe, having mainly a longitudinal dependency. The results of the analysis are briefly discussed with regard to possible mechanisms responsible for these variations and to mantle conductivity.
  • 关键词:Geomagnetic field variation ;multi-taper method ;time series analysis
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