The use of more realistic parameters in numerical geodynamo simulations tends to generate less Earth-like magnetic fields. This paradox could be resolved by considering uniform heat flux instead of uniform temperature at the core's surface.
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Buffett, B. A matter of boundaries. Nature Geosci 2, 741–742 (2009). https://doi.org/10.1038/ngeo673
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DOI: https://doi.org/10.1038/ngeo673
