Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 48, Issue 12, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL091709
Keywords
High accuracy; high resolution; new reference spectrum; solar irradiance
Categories
Funding
- NASA TSIS-1 project [80GSFC18C0056]
- NASA's Solar Irradiance Science Team [80NSSC18K1304]
- NASA's Earth Science Technology Office
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A new solar irradiance reference spectrum representing solar minimum conditions has been developed, utilizing a hybrid approach to standardize different sources of high spectral resolution solar line data. The resulting spectrum has high spectral resolution and low uncertainties, covering a wide range of wavelengths.
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 202-2730 nm at 0.01 to similar to 0.001 nm spectral resolution with uncertainties of 0.3% between 460 and 2365 nm and 1.3% at wavelengths outside that range.
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