Spectral ratio analysis of the Fe I 4377 Å line in HARPS-N Sun-as-a-star spectra recovers facular filling factors that track SDO/HMI measurements (Pearson R = 0.587–0.927).
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The Fe I 4377 {\AA} Line as a Solar Faculae Indicator: Insights from Spectral Ratio Analysis
Spectral ratio analysis of the Fe I 4377 Å line in HARPS-N Sun-as-a-star spectra recovers facular filling factors that track SDO/HMI measurements (Pearson R = 0.587–0.927).