Evidence for long-term brightness changes of solar-type stars View Full Text


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Article Info

DATE

1990-12

AUTHORS

Sallie Baliunas, Robert Jastrow

ABSTRACT

CHANGES in the brightness of the Sun may introduce further uncertainties into forecasts of global warming by the greenhouse effect. The Sun is known to vary in brightness, on a timescale of years, by 0.1% in phase with changes in magnetic activity during the solar cycle1–3, and variations of up to 0.4%, also correlated with surface magnetic activity, have been found in stars similar to the Sun4. To delimit the magnitude of solar luminosity variations on a timescale of centuries, we have looked at the magnetic behaviour of a number of solar-type stars over several years. Observed in random phases of their long-term variability, they give a sample of the behaviour of a solar-type star over a long period of time. We find indirect evidence that these stars undergo brightness changes of more than the 0.1% observed during the last solar cycle, a result that calls into question the assumption of a constant Sun in calculations using general circulation models for climate forecasting. More... »

PAGES

520-523

References to SciGraph publications

  • 1988. The Climatic Impact of Secular Variations in Solar Irradiance in SECULAR SOLAR AND GEOMAGNETIC VARIATIONS IN THE LAST 10,000 YEARS
  • 1988. Variability of the Present and Ancient Sun: A Test of Solar Uniformitarianism in SECULAR SOLAR AND GEOMAGNETIC VARIATIONS IN THE LAST 10,000 YEARS
  • 1988-09. Total solar irradiance measurements by ERB/Nimbus-7. A review of nine years in SPACE SCIENCE REVIEWS
  • 1988-04. Solar luminosity variations in solar cycle 21 in NATURE
  • 1982-06. Solar, volcanic, and CO2 forcing of recent climatic changes in CLIMATIC CHANGE
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1038/348520a0

    DOI

    http://dx.doi.org/10.1038/348520a0

    DIMENSIONS

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