GSICS Reference Solar Spectrum

GSICS/CEOS Reference Solar Spectrum Datasets

Python Readers of the Solar Data sets and their intercomparisons can be found at colab file

1. TSIS-1 Reference Solar.

The new solar irradiance reference spectrum is 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 ∼0.001 nm spectral resolution with uncertainties of 0.3% between 460 and 2365 nm and 1.3% at wavelengths outside that range. ( Content Taken from Abstract of Published paper Coddington et al 2021 )

The original TSIS-1 HSRS published at

Version 2 of the TSIS-1 HSRS is published at

HSRS Extension is published at


Coddington, O. M., Richard, E. C., Harber, D., Pilewskie, P., Woods, T. N., Chance, K., et al. (2021). The TSIS-1 Hybrid Solar Reference Spectrum. Geophysical Research Letters, 48, e2020GL091709. https://doi. org/10.1029/2020GL091709

Contact: Odele Coddington, CLASP

2. Whole Heliosphere Interval spectrum is an observationally-based spectrum covering 0.1 nm to 2400 nm at 0.1-nm spacing (although that’s smaller than the instrument resolution in some spectral regions) for a time representing solar minimum as based on observations during the 10-16 April 2008 period from multiple instruments. This is thought to supersede Thullier's traditional ATLAS spectrum for accuracy.

Dataset: ref_solar_irradiance_whi-2008_ver2.dat

Reference: Woods, T. N., P. C. Chamberlin, J. W. Harder, R. Hock, M. Snow, F. G. Eparvier, J. Fontenla, W. E. McClintock, and E. C. Richard, Solar Irradiance Reference Spectra (SIRS) for the 2008 Whole Heliosphere Interval (WHI), Geophys. Res. Lett., 2008.

Contact: Greg Kopp

3. SAO2010 spectrum. Observationally based using a combination of several ground-, balloon-, and space-based instruments and covers the spectral region from 200 to 1001 nm with 0.04-nm resolution, thanks to the KPNO FTS. Accuracy is about 5%.

Dataset: https ://

Reference: Chance, K.; Kurucz, R. L., An improved high-resolution solar reference spectrum for earth's atmosphere measurements in the ultraviolet, visible, and near infrared, Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 111, issue 9, pp. 1289-1295

Contact: Greg Kopp

4. Solar Radiation Physical Modeling (SRPM), A computationally-based reference spectrum covering 200 nm to 100 microns. This model is representative of the quiet Sun.

Dataset: http ://

Reference: Fontenla, J.M., Curdt, W., Haberreiter, M., Harder, J., and Tian H., Semiempirical models of the solar atmosphere. III. Set of Non-LTE Models for Far-Ultraviolet/Extreme-Ultraviolet Irradiance Computation, ApJ, 707, 482-502, doi: 10.1088/0004-637X/707/1/482, 2009.

Contact: Greg Kopp

5. SCIAMACHY solar spectrum is in preparation.



Contact: Matthijs Krijger

6.SOLSPEC solar spectrum The Infrared Solar Spectrum Measured by the SOLSPEC Spectrometer Onboard the International Space Station.


Reference: Gerard Thuillier, J. W. Harder, A. Shapiro, T. N. Woods, J.-M. Perrin, et al.. The Infrared Solar Spectrum Measured by the SOLSPEC Spectrometer Onboard the International Space Station. Solar Physics, Springer Verlag, 2015, 290 (6), pp.1581-1600. <10.1007/s11207-015-0704-1>. <insu-01164266>

Contact: Steven Dewitte

7. Aura/OMI, SORCE SIM, SORCE SOLTICE solar spectrum comparison.

Dataset: (

Reference: Marchenko, S.V., and M. T. Deland, Solar Spectral Irradiance Changes During Cycle 24, 2014, The Astrophysical Journal, 789:117 (17pp), 2014 July 10, doi:10.1088/0004-637X/789/2/117, (

Contact: Larry Flynn

-- TimHewison - 23 Nov 2016
Topic revision: r4 - 03 Jun 2023, ManikBali
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