Solar Physics

, 293:161 | Cite as

Revision of the Sun’s Spectral Irradiance as Measured by SORCE SIM

  • Steffen MauceriEmail author
  • Peter Pilewskie
  • Erik Richard
  • Odele Coddington
  • Jerald Harder
  • Tom Woods


The Spectral Irradiance Monitor (SIM) instrument on board the Solar Radiation and Climate Experiment (SORCE) performs daily measurements of the solar spectral irradiance (SSI) from 200 to 2400 nm. Both temporal and spectral corrections for instrument degradation have been built on physical models based on comparison of two independent channels with different solar exposure. The present study derives a novel correction for SIM degradation using the total solar irradiance (TSI) measurements from the Total Irradiance Monitor (TIM) on SORCE. The correction is applied to SIM SSI data from September 2004 to October 2012 over the wavelength range from 205 nm to 2300 nm. The change in corrected, integrated SSI agrees within \(0.1~\mbox{W}\,\mbox{m}^{-2}\) (\(1\sigma\)) with SORCE TIM TSI and independently shows agreement with the SATIRE-S and NRLSSI2 solar models within measurement uncertainties.


Solar spectral irradiance Solar spectrum Solar cycle Solar variability Degradation correction 



We thank our anonymous reviewer, whose comments and suggestions strengthened the manuscript and helped to shape its final form.

This research was supported in part by NASA Grant NNX15AI52G.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of Atmospheric and Oceanic SciencesCU BoulderBoulderUSA
  2. 2.Laboratory for Atmospheric and Space PhysicsBoulderUSA

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