Solar Physics

, Volume 289, Issue 7, pp 2433–2457

Accurate Determination of the TOA Solar Spectral NIR Irradiance Using a Primary Standard Source and the Bouguer–Langley Technique

  • D. Bolsée
  • N. Pereira
  • W. Decuyper
  • D. Gillotay
  • H. Yu
  • P. Sperfeld
  • S. Pape
  • E. Cuevas
  • A. Redondas
  • Y. Hernandéz
  • M. Weber
Article

DOI: 10.1007/s11207-014-0474-1

Cite this article as:
Bolsée, D., Pereira, N., Decuyper, W. et al. Sol Phys (2014) 289: 2433. doi:10.1007/s11207-014-0474-1

Abstract

We describe an instrument dedicated to measuring the top of atmosphere (TOA) solar spectral irradiance (SSI) in the near-infrared (NIR) between 600 nm and 2300 nm at a resolution of 10 nm. Ground-based measurements are performed through atmospheric NIR windows and the TOA SSI values are extrapolated using the Bouguer–Langley technique. The interest in this spectral range arises because it plays a main role in the Earth’s radiative budget and also because it is employed to validate models used in solar physics. Moreover, some differences were observed between recent ground-based and space-based instruments that take measurements in the NIR and the reference SOLSPEC(ATLAS3) spectrum. In the 1.6 μm region, the deviations vary from 6 % to 10 %. Our measuring system named IRSPERAD has been designed by Bentham (UK) and has been radiometrically characterized and absolutely calibrated against a blackbody at the Belgian Institute for Space Aeronomy and at the Physikalisch-Technische Bundesanstalt (Germany), respectively. A four-month measurement campaign was carried out at the Izaña Atmospheric Observatory (Canary Islands, 2367 m a.s.l.). A set of top-quality solar measurements was processed to obtain the TOA SSI in the NIR windows. We obtained an average standard uncertainty of 1 % for 0.8 μm<λ<2.3 μm. At 1.6 μm, corresponding to the minimum opacity of the solar photosphere, we obtained an irradiance of 234.31±1.29 mWm−2 nm−1. Between 1.6 μm and 2.3 μm, our measurements show a disagreement varying from 6 % to 8 % relative to ATLAS3, which is not explained by the declared standard uncertainties of the two experiments.

Keywords

Ground-based Near-infrared Solar spectral irradiance Top of atmosphere 

Supplementary material

Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • D. Bolsée
    • 1
  • N. Pereira
    • 1
  • W. Decuyper
    • 1
  • D. Gillotay
    • 1
  • H. Yu
    • 1
  • P. Sperfeld
    • 2
  • S. Pape
    • 2
  • E. Cuevas
    • 3
  • A. Redondas
    • 3
  • Y. Hernandéz
    • 3
  • M. Weber
    • 4
  1. 1.BIRA-IASBBrusselsBelgium
  2. 2.Physikalisch-Technische BundesanstaltBraunschweigGermany
  3. 3.Izaña Atmospheric Research Center (AEMET)TenerifeSpain
  4. 4.Institut für UmweltphysikUniversität BremenBremenGermany