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Nature 389, 337-338 (25 September 1997) | doi:10.1038/38622
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Geophysics: Probing Earth's dynamo
Peter Olson1
Most of the planets in our Solar System, Earth among them, have magnetic fields that originate from self-sustaining dynamos; so, too, do the jovian satellites Io and Ganymede, according to the results from the Galileo mission1. Planetary magnetism is a common phenomenon because only three basic ingredients are needed for a dynamo: a sufficiently large volume of electrically conducting fluid somewhere in the planet's interior, an energy source such as convection to circulate the fluid, and planetary rotation to organize the resulting fluid motions.
- Peter Olson is in the Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA.
e-mail: Email: olson@gibbs.eps.jhu.edu
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