Contribution of Ultraviolet Irradiance Variations to Changes in the Sun's Total Irradiance

@article{Lean1989ContributionOU,
  title={Contribution of Ultraviolet Irradiance Variations to Changes in the Sun's Total Irradiance},
  author={Judith Lean},
  journal={Science},
  year={1989},
  volume={244},
  pages={197 - 200}
}
  • J. Lean
  • Published 14 April 1989
  • Environmental Science, Medicine
  • Science
The sun's total irradiance decreased from 1980 to mid-1985, remained approximately constant until mid-1987, and has recently begun to increase. This time interval covered the decrease in solar activity from the maximum of solar cycle 21 to solar minimum and the onset of cycle 22. The sun's ultraviolet irradiance also decreased during the descending phase of cycle 21 and, like the total irradiance, is now increasing concurrently with the increase in cycle 22 activity. Although only 1 percent of… Expand

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References

SHOWING 1-10 OF 24 REFERENCES
Solar luminosity variations in solar cycle 21
The ACRIM I experiment (Active Cavity Radiometer Irradiance Monitor) on the solar maximum Mission (SMM) satellite has provided a nearly continuous record of solar total irradiance variations sinceExpand
A Model of Solar Luminosity Modulation by Magnetic Activity Between 1954 and 1984
A simple model based on the changes in excess radiation from bright magnetic faculae and on changes in reduced radiation from dark spots is remarkably successful in matching the slow variations ofExpand
Influence of solar variability on global sea surface temperatures
  • G. Reid
  • Environmental Science
  • Nature
  • 1987
Recent measurements1 have shown that the total solar irradiance decreased at a rate of 0.019% per year between 1980 and 1985, and may still be decreasing. Presumably, this reflects a cyclicalExpand
Magnetic modulation of solar luminosity by photospheric activity
The behavior of slow changes in solar irradiance S is studied using measurements obtained with radiometers on the SMM and Nimbus 7 spacecraft. The general downtrend in the radiometer readings isExpand
Ultraviolet solar irradiance measurement from 200 to 358 nm during spacelab 1 mission
The paper presents the results obtained from the UV-spectrometer of the ‘Solar Spectrum Experiment’ during the Spacelab 1 mission in December 1983. The irradiance data concern 492 passbands, whichExpand
The influence of faculae on total solar irradiance and luminosity
The reported investigation of the facular contribution to the total solar irradiance is based on the data provided by the Active Cavity Radiometer Irradiance Monitor (ACRIM) for 1980-1982, and on theExpand
Spectrum Line Intensity as a Surrogate for Solar Irradiance Variations
TLDR
Comparisons with ground-based, irradiance spectrophotometry of selected Fraunhofer lines independently confirm the variability in the ACRIM Se, signal, indicate that the source of irradiance is faculae, and indicate that ACRim Se, follows the 11-year activity cycle. Expand
The Surface Temperature of the Sun and Changes in the Solar Constant
The solar distortion telescope has been used to measure the limb shape and latitude dependence of the limb brightness during the summer months for a 5-year period - a time base sufficient to detectExpand
Solar cycle variation of sunspot intensity
Broad band pinhole photometer intensity observations of 15 large sunspots covering the spectral region 0.387–2.35 μm are presented. The data are based on measurements on approximately 500 days duringExpand
Initial Solar Irradiance Determinations from Nimbus 7 Cavity Radiometer Measurements
Preliminary results from solar radiation measurements from the earth radiation budget experiment on the Nimbus 7 satellite yield a mean value of 1376.0 watts per square meter for the "solar constant"Expand
...
1
2
3
...