Evolutionary variations of solar luminosity

Physics

Scientific paper

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Climate, Greenhouse Effect, Luminosity, Prediction Analysis Techniques, Solar Constant, Variations, Climatology, Evolution (Development), Illuminance, Paleoclimatology, Solar Physics, Solar Wind

Scientific paper

Theoretical arguments for a 30% increase in the solar luminosity over the past 4.7 billion years are reviewed. A scaling argument shows that this increase can be predicted without detailed numerical calculations. The magnitude of the increase is independent of nuclear reaction rates, as long as conversion of hydrogen to helium provides the basic energy source of the Sun. The effect of the solar luminosity increase on the terrestrial climate is briefly considered. It appears unlikely that an enhanced greenhouse effect, due to reduced gases (NH3, CH4), can account for the long-term paleoclimatic trends.

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