Powering Earth’s dynamo with magnesium precipitation from the core

  title={Powering Earth’s dynamo with magnesium precipitation from the core},
  author={J. O’Rourke and D. Stevenson},
  • J. O’Rourke, D. Stevenson
  • Published 2016
  • Physics, Medicine
  • Nature
  • Earth’s global magnetic field arises from vigorous convection within the liquid outer core. Palaeomagnetic evidence reveals that the geodynamo has operated for at least 3.4 billion years, which places constraints on Earth’s formation and evolution. Available power sources in standard models include compositional convection (driven by the solidifying inner core’s expulsion of light elements), thermal convection (from slow cooling), and perhaps heat from the decay of radioactive isotopes. However… CONTINUE READING
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