Abstract
The most interesting result in solar luminosity studies in teh ast decade has been the detection of significant variations in the total irradiance by precision radiometers on teh the NIMBUS-7 and SMM spacecraft. A substantial fraction of the observed variation can be attributed to sunspot blocking. Thermanl storage models indicate that the blocked flux can be stored in a slight increase of the thermal and potential energy of the cinvective zone. The thermal storage time is likely to far exceed one solar activity cycle, implying an a11-year modualtion of the solar constant at a level of about 0.1%. Direct observations of teh 11-year or longer variantions are more difficult but there is some evidence for secular trends below about 0.4% amplitude over the 14-year period of modern sampling. Ongoing photometric programs suggest that luminosity changes exceeding 1% may have been detected in yound, chromospherically active stars.
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Eddy, J.A., Foukal, P.V. (1983). Solar Luminosity Variations. In: West, R.M. (eds) Highlights of Astronomy. International Astronomical Union / Union Astronomique Internationale, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7110-3_5
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