Physics
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012soph..276...35c&link_type=abstract
Solar Physics, Volume 276, Issue 1-2, pp. 35-41
Physics
Scientific paper
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.
Chapman Gary A.
Cookson Angela M.
Preminger Dora G.
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