Comparison of TSI from SORCE TIM with SFO Ground-Based Photometry |
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| Authors: | G A Chapman A M Cookson D G Preminger |
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| Institution: | 1. San Fernando Observatory, Department of Physics and Astronomy, California State University, Northridge, Northridge, CA, 91330, USA
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| 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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