Solar variability

Astronomy and Astrophysics – Astronomy

Scientific paper

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Periodic Variations, Solar Constant, Spaceborne Astronomy, Climatology, Solar Terrestrial Interactions, Stellar Luminosity

Scientific paper

Reference is made to direct measurements carried out by space-borne detectors which have shown variations of the solar constant at the 0.2 percent level, with times scales ranging from days to tens of days. It is contended that these changes do not necessarily reflect variations in the solar luminosity and that, in general, direct measurements have not yet been able to establish (or exclude) solar luminosity changes with longer time scales. Indirect techniques, however, especially radius measurements,suggest that solar luminosity variations of up to approximately 0.7 percent have occurred within a period of tens to hundreds of years.

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