Observations of the Hanle effect have revealed the existence of small-scale ‘hidden’ magnetic flux on the quiet Sun. The magnetic-energy density of this hidden flux is much larger than previously thought.
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Stenflo, J. Hidden magnetism. Nature 430, 304–305 (2004). https://doi.org/10.1038/430304a
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DOI: https://doi.org/10.1038/430304a
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