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Magnetic D component at the Earth's surface (AE Map) 1590-1990.webm
https://en.wikipedia.org/wiki/Geomagnetic_secular_variation Four centuries of geomagnetic secular variation from historical records Jackson, A., Jonkers, A. R. T. and Walker, M. R. Phil. Trans. Roy. Soc. A (2000) Vol. 358, pp957-990 Some of the data and modelling procedures were also described in the earlier papers: Time-dependent mapping of the magnetic field at the core-mantle boundary Bloxham, J. and Jackson, A. Journal of Geophysical Research Vol. 97, B13, pp.19537-19563 Geomagnetic Secular Variation Bloxham, J., Gubbins, D. and Jackson, A. Phil. Trans. Roy. Soc. A (1989) Vol. 329 pp415-502
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