Four centuries of geomagnetic secular variation from historical records

  title={Four centuries of geomagnetic secular variation from historical records},
  author={Andrew E. Jackson and Roel Jonkers and Matthew R. Walker},
We present a new model of the magnetic ­ eld at the core{mantle boundary for the interval 1590{1990. The model, called gufm1, is based on a massive new compilation of historical observations of the magnetic ­ eld. The greater part of the new dataset originates from unpublished observations taken by mariners engaged in merchant and naval shipping. Considerable attention is given to both correction of data for possible mislocation (originating from poor knowledge of longitude) and to proper… CONTINUE READING
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