The TSIS-1 Hybrid Solar Reference Spectrum
O. M. Coddington1, E. C. Richard1, D. Harber1, P. Pilewskie1,2, T. N. Woods1, K. Chance3, X. Liu3, and K. Sun4,5
1Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, USA.
2Department for Atmospheric and Oceanic Science, University of Colorado Boulder, USA.
3 Harvard-Smithsonian Center for Astrophysics, Cambridge, USA.
4 Department of Civil, Structural and Environmental Engineering, University at Buffalo, Buffalo, USA.
5 Research and Education in eNergy, Environment and Water (RENEW) Institute, University at Buffalo, Buffalo, USA.
Corresponding author: Odele Coddington (odele.coddington@lasp.colorado.edu)
†Additional author notes should be indicated with symbols (current addresses, for example).
Key Points:
Abstract
We present a new solar irradiance reference spectrum representative of solar minimum conditions between solar cycles 24 and 25. The Total and Spectral Solar Irradiance Sensor-1 (TSIS-1) Hybrid Solar Reference Spectrum (HSRS) is developed by applying a modified spectral ratio method to normalize very high spectral resolution solar line data to the absolute irradiance scale of the TSIS-1 Spectral Irradiance Monitor (SIM) and the CubeSat Compact SIM (CSIM). The high spectral resolution solar line data are the Air Force Geophysical Laboratory ultraviolet solar irradiance balloon observations, the ground-based Quality Assurance of Spectral Ultraviolet Measurements In Europe Fourier transform spectrometer solar irradiance observations, the Kitt Peak National Observatory solar transmittance atlas, and the semi-empirical Solar Pseudo-Transmittance Spectrum atlas. The TSIS-1 HSRS spans 202 nm to 2730 nm at 0.01 to ~0.001 nm spectral resolution with uncertainties of 0.3% between 400 and 2365 nm and 1.3% at wavelengths outside that range.