Table 3.

Instrument performance.

Mission/Instrument Stated accuracy (ppm) Stability* (ppm year−1) Noise* (ppm)
ACRIMSat/ACRIM3 1000 61 36–39
PICARD/PREMOS 300 34 28–33
SoHO/VIRGO 1000 27 28–32
SORCE/TIM 350 10 (est.) 4–17

Based on analyses presented in this study (rather than the instruments’ stated values).

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