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Tidal dissipation and the strength of the Earth’s internal magnetic field

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  • Bruce A. Buffett

    (University of California)

Abstract

Magnetic field strength within Earth's core It is known that the magnetic field we experience at Earth's surface is a fraction of the strength of that prevailing inside the core, but the internal magnetic field cannot be measured directly. Bruce Buffett presents a new indirect estimate for the magnetic field strength within Earth's core based on measurements of tidal dissipation. The results suggest that previously reported evidence of anomalous dissipation in Earth's nutations can be explained with a core-averaged field of 2.5 millitesla, eliminating the need for high fluid viscosity or a stronger magnetic field at the inner-core boundary.

Suggested Citation

  • Bruce A. Buffett, 2010. "Tidal dissipation and the strength of the Earth’s internal magnetic field," Nature, Nature, vol. 468(7326), pages 952-954, December.
    • Handle: RePEc:nat:nature:v:468:y:2010:i:7326:d:10.1038_nature09643
    DOI: 10.1038/nature09643
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