Whitepaper #082 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research; infrastructure/workforce/other programmatic. Additional topics: research tools and infrastructure; ground-based missions/projects; solar physics; […]
We illustrate the scientific return and explore the technical requirements of a network of spectrographs devoted to long-term monitoring disk-integrated, solar spectral variability at high spectral resolution and high photometric accuracy. The proposed sun-as-a-star observations offer the opportunity for a variety of multidisciplinary studies including stellar variability and Sun-Earth connection.