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


The SOlar Stellar Irradiance Comparison Experiment (SOLSTICE) is one of four solar irradiance measurement experiments that was launched as part of the Solar Radiation and Climate Experiment (SORCE) on January 25, 2003. SORCE SOLSTICE is a follow-on to the very successful SOLSTICE launched aboard the Upper Atmospheric Research Satellite (UARS) in 1991 [Rottman et al., 1993]. The new SOLSTICE makes daily solar ultraviolet (115-320 nm) irradiance measurements and compares them to the irradiance from an ensemble of 18 stable early-type stars. This approach provides an accurate monitor of instrument in-flight performance and provides a basis for solar-stellar irradiance comparison for future generations.

The SOLSTICE V18 0.1 nm resolution measurements of solar spectral irradiance are available at


The NRLSSI2 model of spectral irradiance variability, the facular and sunspot indices input to the model, and a description of the model algorithm are available at


These data sets, as well as the OMI solar spectral irradiance measurements, are also at the LASP Interactive Solar Irradiance Data Center, A file of the NRLSSI2h modeled solar irradiance spectra at wavelengths from 115.0 to 499.9 nm, daily from 1978 to 2021 (inclusive), is available at

Contact: Odele Coddington, LASP

-- TimHewison - 23 Nov 2016
Topic revision: r5 - 16 May 2024, ManikBali
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