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Towards the reconstruction of the EUV irradiance for solar Cycle 23

Published online by Cambridge University Press:  05 July 2012

Margit Haberreiter
Margit Haberreiter*
Affiliation:
Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center, 7260 Davos Dorf, Switzerland email: [email protected]
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Abstract

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We present preliminary reconstructions of the EUV from 26 to 34 nm from February 1997 to May 2005, covering most of solar cycle 23. The reconstruction is based on synthetic EUV spectra calculated with the spectral synthesis code Solar Modeling in 3D (SolMod3D). These spectra are weighted by the relative area coverage of the coronal features as identified from EIT images. The calculations are based on one-dimensional atmospheric structures that represent a temporal and spatial mean of the chromosphere, transition region, and corona. The employed segmentation analysis considers coronal holes, the quiet corona, and active regions identified on the solar disk. The reconstructed EUV irradiance shows a good agreement with observations taken with the CELIAS/SEM instrument onboard SOHO. Further improvement of the reconstruction including more solar features as well as the off-limb detection of activity features will be addressed in the near future.

Keywords

Sun: coronaSun: UV radiationline: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S286: Comparative Magnetic Minima: Characterizing quiet times in the Sun and Stars , October 2011 , pp. 97 - 100
Copyright
Copyright © International Astronomical Union 2012

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