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Comparison of TSI from SORCE TIM with SFO Ground-Based Photometry

Abstract

Total solar irradiance (TSI) measurements have been available from the TIM instrument on the SORCE spacecraft since 2003. We compare TSI data, both 24-h and 6-h averages, with photometric indices from red and K-line images obtained on a daily basis at the San Fernando Observatory (SFO). For 1253 days of data from 2 March 2003 to 5 May 2010 we compare the data in linear multiple regression analyses. The best results come from using two photometric indices, the red and K-line photometric sums, and SORCE TSI 6-h averages interpolated to the SFO time of observation. For this case, we obtain a coefficient of multiple determination, R 2, of 0.9495 and a quiet-Sun irradiance S 0 = 1360.810 ± 0.004 W m−2. These results provide further support for the hypothesis that the quiet Sun is constant over time.

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Correspondence to G. A. Chapman.

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Chapman, G.A., Cookson, A.M. & Preminger, D.G. Comparison of TSI from SORCE TIM with SFO Ground-Based Photometry. Sol Phys 276, 35–41 (2012). https://doi.org/10.1007/s11207-011-9867-6

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Keywords

  • Solar Phys
  • Total Solar Irradiance
  • Linear Multiple Regression Analysis
  • Total Solar Irradiance Variation
  • Photometric Index