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Marine Magnetism
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The Geomagnetic Field : Seconds to millions of years
Earth's magnetic field varies on timescales from milliseconds to millions of years. Below are a couple of images of various timescales indicating how Earth's magnetic field has varied in the past
The figure above shows the intensity of Earth's magnetic field at Woods Hole back to 1900. These are values estimated from the IGRF spherical harmonic models.
This picture above shows Earth magnetic dipole moment (a measure of how strong Earth's field is) plotted as a function of year since 1600. The data for this plot come from IGRF coefficients back to 1945 and then from a compilation by A.C. Fraser-Smith, Rev. of Geophysics, 25, 1-16, 1987.
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