Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.348..520b&link_type=abstract
Nature (ISSN 0028-0836), vol. 348, Dec. 6, 1990, p. 520-523. Research supported by NSF, Smithsonian Institution, Tennessee State
Physics
127
Brightness, Solar Cycles, Stellar Activity, Stellar Magnetic Fields, Stellar Mass, Global Warming, Greenhouse Effect, Statistical Analysis
Scientific paper
The magnetic behavior of a number of solar-type stars has been investigated over a period of several years in order to delimit the magnitude of solar luminosity variations on a timescale of centuries. Observed in random phases of long-term variability these stars give a sample of the behavior of a solar-type star over a long period of time. It is suggested that a better understanding of luminosity variations of the sun over a large time scale may introduce further uncertainties into forecasts of global warming by the greenhouse effect. Indirect evidence indicates that the stars under investigation undergo brightness changes of more than 0.1 percent observed during the last solar cycle. It is concluded that this result calls into question the assumption of a constant sun in calculations using general circulation models for climate forecasting.
Baliunas Sallie
Jastrow Robert
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