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(a) Absolute TSI observed by VIRGO/SOHO (black) and SORCE/TIM (purple) between June 2010 and July 2014. SOHO/VIRGO is shifted by +0.05 Wm−2 to agree with SORCE/TIM on 31 October 2011 (dashed vertical blue line), which is the reference date for comparison with PREMOS-B. (b) TSI of SORCE/TIM minus VIRGO/SOHO (daily, black dots; smoothed, purple line). SORCE/TIM smoothed and daily data have been shifted so that the median line crosses the zero line. The uncertainty on smoothed SORCE/TIM (pink) is 10 ppm yr−1, and 6 ppm yr−1 for SOHO/VIRGO (grey, along the ΔTSI = 0 dotted line; see Footnote 1) relative to 31 October 2011. The blue horizontal bars represent the periods plotted in Figure 4.
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