Solar active region components show reduced darkening toward the limb compared to the quiet Sun, with faculae and network contrasts peaking near mu=0.3 at ~4% and ~2% excess, unlike PHOENIX and ATLAS model predictions.
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Direct pixel-by-pixel comparison of 4-hour time series of Fe I 617.3 nm line-of-sight velocities from SO/PHI-HRT and SDO/HMI during Sun-Earth line crossing yields slope 0.96, 92% correlation, and formation-height difference of 7±14 km after alignment and large-scale velocity removal.
citing papers explorer
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Center-to-limb variations of solar active regions: Observations of spots, faculae, and network in the 6173 \AA\ continuum
Solar active region components show reduced darkening toward the limb compared to the quiet Sun, with faculae and network contrasts peaking near mu=0.3 at ~4% and ~2% excess, unlike PHOENIX and ATLAS model predictions.
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Solar photospheric velocities measured in space: a comparison between SO/PHI-HRT and SDO/HMI
Direct pixel-by-pixel comparison of 4-hour time series of Fe I 617.3 nm line-of-sight velocities from SO/PHI-HRT and SDO/HMI during Sun-Earth line crossing yields slope 0.96, 92% correlation, and formation-height difference of 7±14 km after alignment and large-scale velocity removal.