The study of Earth's core is an exacting task that involves interpreting indirect evidence. An innovative approach to understanding decadal changes in the magnetic field provides a new probe of core dynamics.
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Holme, R. Magnetic ringing of the Earth. Nature 459, 652–653 (2009). https://doi.org/10.1038/459652a
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DOI: https://doi.org/10.1038/459652a