Reconstruction of total and spectral solar irradiance from 1974 to 2013 based on KPVT, SoHO/MDI and SDO/HMI observations

@article{Yeo2014ReconstructionOT,
  title={Reconstruction of total and spectral solar irradiance from 1974 to 2013 based on KPVT, SoHO/MDI and SDO/HMI observations},
  author={Kok Leng Yeo and Natalie A. Krivova and Sami K. Solanki and K.‐H. Glassmeier},
  journal={arXiv: Solar and Stellar Astrophysics},
  year={2014}
}
Total and spectral solar irradiance are key parameters in the assessment of solar influence on changes in the Earth's climate. We present a reconstruction of daily solar irradiance obtained using the SATIRE-S model spanning 1974 to 2013 based on full-disc observations from the KPVT, SoHO/MDI and SDO/HMI. SATIRE-S ascribes variation in solar irradiance on timescales greater than a day to photospheric magnetism. The solar spectrum is reconstructed from the apparent surface coverage of bright… 

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TLDR
A new technique called the Multiple Same-Irradiance-Level (MuSIL) analysis has been developed, which examines an SSI time series at different levels of solar activity to provide long-term trends in an SSi record, and the most common result is a downward trend that most likely stems from uncorrected instrument degradation.
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