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:
- The
TSIS-1 Spectral Irradiance Monitor and Compact SIM instruments observe
the Sun’s irradiance spectrum at high accuracy.
- The TSIS-1 Hybrid Solar Reference Spectrum consists of high resolution
solar line data normalized to the TSIS-1 SIM irradiance spectrum.
- The
TSIS-1 Hybrid Solar Reference Spectrum has at least 0.01 nm spectral
resolution, spans 202 to 2730 nm, and is accurate to 0.3 to 1.3%.
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.