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(a) Compared are daily values of the Sun’s total irradiance from radiometers on different space platforms as published by the instrument teams since November 1978. VIRGO is plotted on its original scale and ACRIM3 on the corrected scale of Willson (2014); VIRGO can be reduced to its new scale by multiplying the values by 0.996381, which brings it to the level of TIM. (b) Daily values of the square root of the sunspot number () which will be used in the following analysis. Note the changes of the minima values indicated on top of the vertical lines at their time, especially for the recent one.
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