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.
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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.
Hirayama, T.: 1978, ‘A Model of Solar Faculae and Their Lifetime’. Publ. Astron. Soc. Jpn. 30, 337–352.
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.
Kurucz, R. L.: 1992a, ‘Atomic and molecular data for opacity calculations’. Revista Mexicana de Astronomia y Astrofisica 23, 45–48.
Kurucz, R. L.: 1992b, ‘Finding the’ Missing’ solar ultraviolet opacity.’. Revista Mexicana de Astronomia y Astrofisica 23, 181–186.
Kurucz, R. L.: 1992c, ‘Remaining line opacity problems for the solar spectrum’. Revista Mexicana de Astronomia y Astrofisica 23, 187–194.
Solanki, S. K.: 1993, ‘Small scale solar magnetic fields-an overview’. Space Science Reviews 63, 1–188.
Solanki, S. K. and V. Brigljević: 1992, ‘Continuum brightness of solar magnetic elements’. Astron. Astrophys. 262, L29–L32.
Solanki, S. K. and J. O. Stenflo: 1984, ‘Properties of solar magnetic fluxtubes as revealed by Fe I lines’. Astron. Astrophys. 140, 185–198.
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.
Unruh, Y. C., S. K. Solanki, and M. Fligge: 2000, ‘Modelling solar spectral irradiance variations’, Space Sci. Rev., this volume.
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Fligge, M., Solanki, S. & Unruh, Y. Modelling Short-Term Spectral Irradiance Variations. Space Science Reviews 94, 139–144 (2000). https://doi.org/10.1023/A:1026706920261
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DOI: https://doi.org/10.1023/A:1026706920261