Solar Physics

, Volume 98, Issue 1, pp 23–38 | Cite as

Photospheric limb-darkening signatures of global structure variations

  • L. D. Petro
  • P. V. Foukal
  • Robert L. Kurucz


Observations of short-term irradiance variations and consideration of mechanisms of the solar activity cycle suggest the possibility of long-term variation of the solar flux. Since the limb darkening is sensitive to effective temperature and convective efficiency, observations of the solar limb darkening may provide a useful means to detect and study long-term global variations. The limb-darkening responses to impulsive variation (in depth) of the source function, to effective temperature variation, and to convection variations are presented. For the variations considered, the limb-darkening variation is approximately linearly proportional to the associated parameters. The minimum detectable amplitude of those parametric variations is derived as a function of observational noise. Given our demonstrated errors of observation, single-parameter sensitivies are 3 K for effective temperature variation and 0.007 for local mixing-length variation for year to year changes at 99% confidence.


Convection Solar Activity Structure Variation Parametric Variation Activity Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Company 1985

Authors and Affiliations

  • L. D. Petro
    • 1
  • P. V. Foukal
    • 1
  • Robert L. Kurucz
    • 2
  1. 1.Atmospheric and Environmental Research, Inc.CambridgeUSA
  2. 2.Harvard-Smithsonian Center for AstrophysicsCambridgeUSA

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