Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1814c&link_type=abstract
American Astronomical Society, SPD meeting #42, #18.14; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Total Solar Irradiance (TSI) measurements have been available from the TIM instrument on the SORCE spacecraft since 2003. We compare TSI data with photometric indices from red and K-line images obtained on a daily basis at the San Fernando Observatory (SFO). For 1375 days of data from 2003 March 02 to 2010 May 05 we compare the data in linear multiple regression analyses. The best results come from using only two photometric indices, the red and K-line photometric sums, and SORCE TSI 6-hour averages interpolated to the SFO time of observation. For this case, we obtain a coefficient of multiple correlation, R2, of 0.94798 and a quiet-Sun irradiance, So = 1360.778 ± 0.004 W/m2. These results provide tighter contstraints than before on hypotheses linking TSI variations with assumed changes in the quiet Sun. This research has been partially supported by NSF Grant ATM-0848518.
Chapman Gary A.
Cookson Angela
Preminger Dora
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