Fig. 15.
Panel a: scale of the intensity contrast on each data day relative to the mean level over all the data days at the core (black) and continuum (red) of the Fe I 6173 Å line, and 1700 Å (blue). The RMS deviation from unity is indicated. Panel b: solar activity at the data days, as indicated by the sunspot number (purple) and the Mg II index (green).
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