Table 1 Uncertainty of sky irradiance based on comparison between \(f^{{{\text{obs}}}}\) and \(f^{{{\text{gf}}}}\)
Wavelength | Num. of data | Standard deviation |
|---|---|---|
315 nm | 127 | \(5.0\times {10}^{-3}\) |
340 nm | 117 | \(3.0\times {10}^{-3}\) |
380 nm | 104 | \(1.9\times {10}^{-3}\) |
400 nm | 122 | \(2.7\times {10}^{-3}\) |
500 nm | 119 | \(2.9\times {10}^{-3}\) |
675 nm | 114 | \(4.1\times {10}^{-3}\) |
870 nm | 135 | \(6.5\times {10}^{-3}\) |
1020 nm | 105 | \(4.3\times {10}^{-3}\) |
940 nm | 110 | \(4.3\times {10}^{-3}\) |
1627 nm | 56 | \(4.8\times {10}^{-3}\) |
2200 nm | 57 | \(4.4 \times 10^{ - 3}\) |