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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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.