Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21711307c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #113.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Understanding changes in the solar flux over the age of the solar system is vital for understanding the evolution of planetary atmospheres. We describe a numerical parameterization for wavelength dependent changes to the non-attenuated solar flux appropriate for most times and places in the solar system. We combine published data from the Sun and solar analogs to estimate enhanced FUV and Xray fluxes for the young Sun, describe a new parameterization for the near UV where both the chromosphere and photosphere contribute to the flux, and use Kurucz models to estimate variable visible and infrared fluxes. The parameterization, a series of multipliers relative to the modern top of the atmosphere flux at Earth, is valid from 2 nm through the infrared, and from 0.6 Gyr through 6.7 Gyr, and is extended from the solar zero age main sequence to 8.0 Gyr subject to additional uncertainties. The parameterization is applied to a representative modern day solar flux, providing quantitative estimates of the wavelength dependence of solar flux for a range of paleodates that are relevant to studies of the chemical evolution of planetary atmospheres. We validate the code by comparison to the solar proxies Kappa1 Ceti and EK Draconis, and provide an Monte Carlo analysis of the uncertainties due to measurement error, unknown stellar ages, and intrinsic variability.
Catling David
Claire Mark
Cohen Martin
Ribas Ignasi
Sheets John
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