Earth's spin rate varies with time. A six-year periodic signal in the planet's core is partly responsible, and increases the interior magnetic-field strength to much higher levels than previously thought.
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Jackson, A. A new turn for Earth's rotation. Nature 465, 39–40 (2010). https://doi.org/10.1038/465039a
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DOI: https://doi.org/10.1038/465039a
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Intradecadal variations in length of day and their correspondence with geomagnetic jerks
Nature Communications (2020)
