The Surface Temperature of the Sun and Changes in the Solar Constant

@article{Kuhn1988TheST,
  title={The Surface Temperature of the Sun and Changes in the Solar Constant},
  author={J. Kuhn and K. Libbrecht and R. Dicke},
  journal={Science},
  year={1988},
  volume={242},
  pages={908 - 911}
}
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 detect solar cycle trends in the data. Comparison of these observations with spaceborne measurements of the solar constant suggests that a significant part of the solar cycle variation in irradiance is a result of temporal changes in the latitude-dependent surface temperature of the sun. 
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