The outermost layers of the Sun are hotter than expected. Observation and analysis now confirm that magnetic fields are involved in the heating process, and also signal the existence of a long-sought 'current sheet'.
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Rosner, R. Heat exposure. Nature 425, 672–673 (2003). https://doi.org/10.1038/425672a
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DOI: https://doi.org/10.1038/425672a