Reference Solar Spectra and Their Generation Models

Reference solar spectra are used in many applications. Utilizing a reference spectrum unified manner is necessary for reliable evaluation each application. Since have been updated only recently, the most recent not yet uniformly adopted some To improve this situation, understanding evolution and details of important. However, there few reports on their generation models. This paper reviews models, particularly ASTM G173-03 CIE 241:2020 Simple Model Atmospheric Radiative Transfer Sunshine (SMARTS) model. In addition, key points SMARTS model that affect calculation accuracy spectral irradiance explained. Moreover, issue further comparing with rigorous revealed. The information presented will help users to understand newly correctly use practice.