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2 results

  • 5 - Can Paleomagnetism Distinguish Dynamo Regimes?

  • from Part II - Geomagnetic Field
  • Edited by Mioara Mandea, Monika Korte, Andrew Yau, University of Calgary, Eduard Petrovsky, Academy of Sciences of the Czech Republic, Prague
  • Book:
    Geomagnetism, Aeronomy and Space Weather
    Published online:
    25 October 2019
    Print publication:
    14 November 2019, pp 48-53

  • Summary

    This section describes a paleomagnetic approach to test whether the geodynamo has existed in distinct operating modes through Earth’s history. A central question surrounds how the geodynamo functions during superchrons, where periods lasting 10’s of millions of years passed with no reversals, versus times closer to the present, when reversals happened four to five times per million years. Five numerical dynamos with characteristic reversal frequencies ranging from 2 to 13 Myr-1 were studied to derive the parameters that discriminate them using datasets routinely acquired by paleomagnetists. Once defined, the feasibility of the approach was tested through field and laboratory work.