Comparison of TSI from SORCE TIM with SFO Ground-Based Photometry
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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.
KeywordsSolar Phys Total Solar Irradiance Linear Multiple Regression Analysis Total Solar Irradiance Variation Photometric Index
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