Evolution of Solar Flux

This page contains data files and models from “The evolution of the solar flux from 0.1 nm to 160 microns: quantitative estimates for planetary studies”, Claire et al. 2012, published in the Astrophysical Journal. 

• IDL code can be downloaded by clicking here.
• FORTRAN code is available upon request to the author.
• Please acknowledge the paper if you use the code and notify the author if you change the code substantially.

• If you don’t want to run the code yourself, here are relevant spectra for the top of the atmosphere flux at Earth at various times:
  • The past: 
    • 4.4 Ga
    • 3.8 Ga
    • 2.7 Ga
    • 2.4 Ga
    • 1.8 Ga
    • 0.6 Ga
    • 0.0 Gyr
  • The future: 
    • 5.6 Gyr
• For other ages run the code or contact the author.
• Spectra can be scaled to any solar system object by multiplying by (1/AU)².  

• Note: These spectra are given in photochemical units and are the values directly on the grid points (i.e photons/cm^2/s/nm).  The idl code will return this data in this format or, as an option, will bin the data to your favorite wavelength grid (as photons/cm^2/s or mW/m^2).