The evolution of solar ultraviolet luminosity

Details The evolution of solar ultraviolet luminosity The evolution of solar ultraviolet luminosity

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982rvgsp..20..280z&link_type=abstract

Reviews of Geophysics and Space Physics, vol. 20, May 1982, p. 280-292.

Astronomy and Astrophysics

Astronomy

123

Planetary Atmospheres, Solar Radiation, Stellar Evolution, Stellar Luminosity, Ultraviolet Astronomy, Emission Spectra, Iue, Main Sequence Stars, Planetary Evolution, Solar Corona

Scientific paper

Astronomical observations of stars analogous to the sun are used to construct a tentative account of the evolution of solar UV luminosity. Evidence exists that the young sun was a much more powerful source of energetic particles and radiation than it is today, and while on the main sequence, solar activity has declined as an inverse power law of age as a consequence of angular momentum loss to the solar wind. Observations of pre-main sequence stars indicate that before the sun reached the main sequence, it may have emitted as much as ten thousand times the amount of ultraviolet radiation that it does today. The impact of the results on knowledge of photochemistry and escape of constituents of primordial planetary atmospheres is discussed.

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