Open Access
Table 1.
SOVAP radiometer parameters’ definition and typical values for the “Rad 10” mode.
| Parameters | Definition | Typical values |
|---|---|---|
| Pcl,l − Po,r | Difference in electrical power applied to the cavities | ~0.1056 W |
| C1 | Correction to take into account the heating effects by the wires | 5.9 × 10−6 W |
| C2 | Correction for the accuracy of the servo-system (almost negligible) | 1.2 × 10−6 |
| C′3 | Correction of the thermal radiative effects of the left shutter | ~0.405 W m−2 |
| C4 | Correction of the thermal radiative effects of the mirror above the cavity | ~−0.175 W m−2 |
| C5 | Total correction factor for the optical effects (diffraction and scattering) | 0.999447805 |
| αeff,r | Efficiency of the right cavity | 0.9987 |
| Ar at 20 °C | Measured accurate aperture area at 20 °C | 7.876 × 10−5 m2 |
| Δr | Aperture area (AA) correction factor – expansion of the mirror | ~1.9 × 10−8 |
| Δ′r | AA correction factor – expansion of the radiometer | ~5.4 × 10−8 |
| Δ″r | AA correction factor – deformation during mechanical clamping | ~0 |
| cos θ | Solar pointing angle of the radiometer | ~1 |
| ΔPo,r | Thermo-electrical non-equivalence of the active cavity while open | ~0.3 × 10−3 W |
| KRad10 | Thermo-electrical non-equivalence between the right and the left cavity | ~2.83 × 10−3 W |
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