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Space Science Reviews

, Volume 94, Issue 1–2, pp 139–144 | Cite as

Modelling Short-Term Spectral Irradiance Variations

  • M. Fligge
  • S.K. Solanki
  • Y.C. Unruh
Article

Abstract

On time-scales of the solar rotation most of the solar irradiance variations are caused by the changing distribution of solar surface magnetic features. We model these short-term irradiance variations using calculations of sunspot and facular contrasts as a function of wavelength and limb angle on the Sun. The position of active regions on the solar disc is derived from the MDI magnetograms. The reconstructed irradiance variations are compared with total and spectral irradiance measurements obtained by the VIRGO experiment on SOHO.

Keywords

Active Region Solar Irradiance Magnetic Feature Solar Disc Solar Surface 
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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References

  1. Fligge, M., S. K. Solanki, Y. C. Unruh, C. Fröhlich, and C. Wehrli: 1998, ‘A model of solar total and spectral irradiance variations’. Astron. Astrophys. 335, 709–718.Google Scholar
  2. Hirayama, T.: 1978, ‘A Model of Solar Faculae and Their Lifetime’. Publ. Astron. Soc. Jpn. 30, 337–352.Google Scholar
  3. Knölker, M. and M. Schüssler: 1988, ‘Model calculations of magnetic flux tubes. IV-Convective energy transport and the nature of intermediate size flux concentrations’. Astron. Astrophys. 202, 275–283.Google Scholar
  4. Kurucz, R. L.: 1992a, ‘Atomic and molecular data for opacity calculations’. Revista Mexicana de Astronomia y Astrofisica 23, 45–48.Google Scholar
  5. Kurucz, R. L.: 1992b, ‘Finding the’ Missing’ solar ultraviolet opacity.’. Revista Mexicana de Astronomia y Astrofisica 23, 181–186.Google Scholar
  6. Kurucz, R. L.: 1992c, ‘Remaining line opacity problems for the solar spectrum’. Revista Mexicana de Astronomia y Astrofisica 23, 187–194.Google Scholar
  7. Solanki, S. K.: 1993, ‘Small scale solar magnetic fields-an overview’. Space Science Reviews 63, 1–188.Google Scholar
  8. Solanki, S. K. and V. Brigljević: 1992, ‘Continuum brightness of solar magnetic elements’. Astron. Astrophys. 262, L29–L32.Google Scholar
  9. Solanki, S. K. and J. O. Stenflo: 1984, ‘Properties of solar magnetic fluxtubes as revealed by Fe I lines’. Astron. Astrophys. 140, 185–198.Google Scholar
  10. Unruh, Y. C., S. K. Solanki, and M. Fligge: 1999, ‘The spectral dependence of facular contrast and solar irradiance variations’. Astron. Astrophys. 345, 635–642.Google Scholar
  11. Unruh, Y. C., S. K. Solanki, and M. Fligge: 2000, ‘Modelling solar spectral irradiance variations’, Space Sci. Rev., this volume.Google Scholar

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • M. Fligge
    • 1
  • S.K. Solanki
    • 1
  • Y.C. Unruh
    • 2
  1. 1.Institute of AstronomyETH ZentrumZurichSwitzerland
  2. 2.Institut für AstronomieUniversität WienWienAustria

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