Abstract
We model total solar irradiance (TSI) using photometric irradiance indices from the San Fernando Observatory (SFO), and compare our model with measurements compiled from different space-based radiometers. Space-based measurements of TSI have been obtained recently from ACRIM-3 on board the ACRIMSAT. These data have been combined with other data sets to create an ACRIM-based composite. From VIRGO on board the Solar and Heliospheric Observatory (SOHO) spacecraft two different TSI composites have been developed. The VIRGO irradiance data have been combined by the Davos group to create a composite often referred to as PMOD (Physikalisch-Meteorologisches Observatorium Davos). Also using data from VIRGO, the Royal Meteorological Institute of Belgium (RMIB) has created a separate composite TSI referred to here as the RMIB composite. We also report on comparisons with TSI data from the Total Irradiance Monitor (TIM) experiment on board the Solar Radiation and Climate Experiment (SORCE) spacecraft. The SFO model correlates well with all four experiments during the seven-year SORCE interval. For this interval, the squared correlation coefficient R 2 was 0.949 for SORCE, 0.887 for ACRIM, 0.922 for PMOD, and 0.924 for RMIB. Long-term differences between the PMOD, ACRIM, and RMIB composites become apparent when we examine a 21.5-year interval. We demonstrate that ground-based photometry, by accurately removing TSI variations caused by solar activity, is useful for understanding the differences that exist between TSI measurements from different spacecraft experiments.
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Notes
ACRIM composite TSI daily values from www.acrim.com/DataProducts.htm Version 11/11.
PMOD TSI composite 24-h averages, from the Physikalisch-Meteorologisches Observatorium Davos website, ftp://ftp.pmodwrc.ch/pub/data/irradiance/composite/DataPlots/composite_d41_62_1212.dat .
RMIB composite TSI is at http://remotesensing.oma.be/en/2619579-Data.html .
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Acknowledgements
We thank the students and staff for their efforts in helping to obtain the daily photometric images used in this study. This research was partially supported by NSF Grant ATM-0848518 and NASA Grants NNX11AB51G and NNX11AK46G.
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Chapman, G.A., Cookson, A.M. & Preminger, D.G. Modeling Total Solar Irradiance with San Fernando Observatory Ground-Based Photometry: Comparison with ACRIM, PMOD, and RMIB Composites. Sol Phys 283, 295–305 (2013). https://doi.org/10.1007/s11207-013-0233-8
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DOI: https://doi.org/10.1007/s11207-013-0233-8