Version 2 of the TSIS‐1 Hybrid Solar Reference Spectrum and Extension to the Full Spectrum

Abstract This work describes two achievements to a key data set. First, we present version 2 of the Total and Spectral Solar Irradiance Sensor‐1 Hybrid Reference Spectrum (TSIS‐1 HSRS), which has recently been recognized as new solar irradiance reference standard ( https://calvalportal.ceos.org/ ). Second, “full spectrum extension” TSIS‐1 HSRS. The HSRS observational composite spans 0.202–2.730 μm encompasses more than 97% energy in total (TSI). Version is an incremental update that corrects radiometric baseline between 0.202 0.210 updates lines at wavelengths longward 0.743 those listed most recent database. full extension builds off supports applications require encompassing nearly 100% TSI. It 0.115–200 was developed by incorporating additional observations theoretical knowledge where no direct currently exist.