Advertisement

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
Article

Abstract

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.

Keywords

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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bevington, P. R.: 1969, Data Reduction and Error Analysis for the Physical Sciences, McGraw-Hill, New York, p. 195ff.Google Scholar
  2. Böhm, K.-H.: 1961, Astrophys. J. 134, 264.Google Scholar
  3. Cloutman, L. D.: 1979, Astrophys. J. 227, 614.Google Scholar
  4. Däppen, W.: 1983, Astron. Astrophys. 124, 11.Google Scholar
  5. Dearborn, D. S. P. and Blake, J. B.: 1980a, Nature 287, 365.Google Scholar
  6. Dearborn, D. S. P. and Blake, J. B.: 1980b, Astrophys. J. 237, 616.Google Scholar
  7. Dearborn, D. S. P. and Blake, J. B.: 1982, Astrophys. J. 257, 896.Google Scholar
  8. Dearborn, D. S. P. and Newman, M. J.: 1978, Science 201, 150.Google Scholar
  9. Delache, P.: 1966, Ann. Astrophys. 29, 109.Google Scholar
  10. Eddy, J. A.: 1984, in B. J. LaBonte, G. A. Chapman, H. S. Hudson, and R. C. Willson (eds.), Solar Irradiance Variations on Active Region Time Scales, NASA Conference Publication 2310, p. 213.Google Scholar
  11. Fang, C., Mouradian, Z., Banos, G., Dumont, S., and Pecker, J. C.: 1984, Solar Phys. 91, 61.Google Scholar
  12. Fröhlich, C. and Eddy, J. A.: 1984, Paper presented at COSPAR, July 1984 Session E-2, Graz, Austria.Google Scholar
  13. Gilliland, R. L.: 1982, Astrophys. J. 253, 399.Google Scholar
  14. Goldberg, L. and Pierce, A. K.: 1959, Hand. Phys. 52, 1.Google Scholar
  15. Gough, D.: 1981, in S. Sofia (ed.), Variations of the Solar Constant, NASA Conference Publication 2191, p. 185.Google Scholar
  16. Gray, D. F.: 1967, Astrophys. J. 149, 317.Google Scholar
  17. Henyey, L., Vardya, M. S., and Bodenheimer, P.: 1965, Astrophys. J. 142, 841.Google Scholar
  18. Holweger, H., Livingston, W., and Steenbock, W.: 1983, Nature 302, 125.Google Scholar
  19. Hoyt, D. V.: 1979, Rev. Geophys. Space Phys. 13, 427.Google Scholar
  20. Kurucz, R. L.: 1979, Astrophys. J. Suppl. 40, 1.Google Scholar
  21. Livingston, W.: 1984, in S. L. Keil (ed.), Small-Scale Dynamical Processes in Quiet Stellar Atmospheres, Sacramento Peak National Observatory, Sunspot, NM, p. 330.Google Scholar
  22. Livingson, W. and Holweger, H.: 1982, Astrophys. J. 252, 375.Google Scholar
  23. Macris, C. J. and Rösch, J.: 1983, Compt. Rend. Acad. Sci. Paris 296, Series II, 265.Google Scholar
  24. Macris, C. J., Muller, R., Rösch, J., and Roudier, T.: 1984, in S. L. Keil (ed.), Small-Scale Dynamical Processes in Quiet Stellar Atmospheres, Sacramento Peak National Observatory, Sunspot, New Mexico, p. 265.Google Scholar
  25. McCormac, B. M. (ed.): 1983, Weather and Climate Response to Solar Variations, Colorado Associated University Press, Boulder, Colorado.Google Scholar
  26. Mihalas, D.: 1978, Stellar Atmospheres, 2nd ed., W. H. Freeman and Co., San Francisco, p. 71ff.Google Scholar
  27. Nordlund, A.: 1976, Astron. Astrophys. 50, 23.Google Scholar
  28. Petro, L. D., Foukal, P. V., Rosen, W. A., Kurucz, R. L., and Pierce, A. K.: 1984, Astrophys. J. 283, 426.Google Scholar
  29. Pierce, A. K. and Waddell, J. H.: 1961, Mem. Roy. Astron. Soc. 68, 89.Google Scholar
  30. Pierce, A. K. and Slaughter, C. D.: 1977, Solar Phys. 51, 25.Google Scholar
  31. Rosen, W. A., Foukal, P. V., Kurucz, R. L., and Pierce, A. K.: 1982, Astrophys. J. Letters 253, L89.Google Scholar
  32. Singh, J. and Bappu, M. K. V.: 1981, Solar Phys. 71, 161.Google Scholar
  33. Spiegel, E. A. and Weiss, N. O.: 1980, Nature 287, 616.Google Scholar
  34. Sterne, T. E. and Dieter, N.: 1958, Smithsonian Contr. Astrophys. 9, 3.Google Scholar
  35. Sykes, J. B.: 1953, Monthly Notices Roy. Astron. Soc. 113, 198.Google Scholar
  36. Thomas, J. H.: 1979, Nature 280, 662.Google Scholar
  37. White, O. R.: 1968a, Astrophys. J. 152, 217.Google Scholar
  38. White, O. R.: 1968b, Solar Res. Note, No. 26, Sacramento Peak Observatory, Sunspot, New Mexico.Google Scholar
  39. Willson, R. C., Gulkis, S., Janssen, M., Hudson, H. S., and Chapman, G. A.: 1981, Science 211, 700.Google Scholar

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

Personalised recommendations