Physikalisch-Metorologisches Observatorium Davos -- World Radiation Center pmod-wrc

Solar Reference Spectrum at PMOD/WRC

Solar Reference Spectrum

This reference spectrum is recommended by the CEOS Working Group on Calibration and Validation (CEOS WGCV), particularly the Infrared and Visible Optical Sensors Subgroup. Details can be found under the following links:

The reference spectrum is based on the following key elements:

  1. The absolute scale is determined by the latest observational SSI composite (Haberreiter et al., 2017) which takes into account the ATLAS1 observations by Thuillier et al., (2003). In particular, we use the solar minimum level during the year 2008 as the reference. Details about the SSI composite can be found here.
  2. This dataset is also in agreement with the latest TSI value recommended by the IAU 2015 Resolution B3 (Prsa et al., 2016).
  3. The high-resolution component comes from the synthetic spectrum calculated with the radiative transfer code COSI developed at PMOD/WRC (Haberreiter et al., 2008).

These elements guarantee the correct absolute scale as well as the high-resolution information of the spectrum.

Spectral Resolution: 0.005 nm
Spectral Range: 300 nm to 15 µm

The PMOD/WRC Solar Reference Spectrum can be found on our public FTP server:


  • Haberreiter, M., M. Schöll, T. Dudok de Wit, M. Kretzschmar, S. Misios, K. Tourpali, and Schmutz, W. A new solar UV irradiance observational composite, 2017, Journal of Geophysical Research, in press, DOI: 10.1002/2016JA023492 (Wiley Online Library)
  • Haberreiter, M., Schmutz, W., Hubeny, I., 2008, NLTE model calculations for the solar atmosphere with an iterative treatment of opacity distribution functions, A&A, 492, 833, DOI: 10.1051/0004-6361:200809503 (Abstract)
  • Prša, A., Harmanec, P., Torres, G., Mamajek, E., Asplund, M., Capitaine, N., Christensen-Dalsgaard, J., Depagne, É., Haberreiter, M., Hekker, S., Hilton, J., Kopp, G., Kostov, V., Kurtz, D.W., Laskar, J., Mason, B.D., Milone, E.F., Montgomery, M., Richards, M., Schmutz, W., Schou, J., Stewart, S.G., 2016, Nominal Values for Selected Solar and Planetary Quantities: IAU 2015 Resolution B3, Astronomical Journal, Volume 152, Issue 2, article id. 41, 7, DOI: 10.3847/0004-6256/152/2/41 (Abstract)

For comments or questions please send an email to

Dorfstrasse 33, CH-7260 Davos Dorf, Phone +41 58 467 51 11, Fax +41 58 467 51 00