Table 1
Standard deviation of measured quantities in Wm−2 and in parts per million (ppm). The values during solar minimum 24/25 are from 1 October 2019 to 1 February 2020. The columns labeled ΔTSI are for the period 3 March 2018 to 23 August 2023. The standard deviation of TSI during solar minimum is the upper limit of the 1−σ uncertainty in the measurement (Kopp, 2014). Values are for TSIS-1/TIM version 4 and TSIS-1/SIM version 11.
| Measurement | Solar min (Wm−2) | Solar min (ppm) | ∆TSI (Wm−2) | ∆TSI (ppm) |
|---|---|---|---|---|
| TSIS-1/TSI | 0.025 | 18.4 | ||
| iSSI | 0.039 | 28.7 | 0.080 | 58.8 |
| iSPS | 0.050 | 36.7 | 0.072 | 52.9 |
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