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Same Earth, Different Dynamos

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Science  10 Jan 1997:
Vol. 275, Issue 5297, pp. 160
DOI: 10.1126/science.275.5297.160a

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Summary

SAN FRANCISCO—Geophysicists have long hoped that by studying the magnetic field at Earth's surface, they would be able to unlock the mysteries of the liquid iron core, where the field is generated. But they received a rude shock at last month's meeting of the American Geophysical Union here, when researchers running computer simulations of the churning core reported that very different “geodynamos” can yield the same Earth-like magnetic field at the surface.

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