Fig. 2.
Variation of the granulation contrast (+) and scale (+) at the disk center, corrected from the annual variation of the distance Earth-Sun, between November 2006 and February 2016; each cross represents a monthly average. Linear trends before and after September 2011 are overplotted. Ri and Rs are the Monthly Sunspot Index and the Smoothed Sunspot Index respectively, published by the SIDC (of the Royal Observatory of Belgium), divided by 20 in order to enter into the Contrast y-axis of the figure.
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