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The EUV spectral irradiance of the Sun from 1997 to date

Published online by Cambridge University Press:  26 February 2010

Giulio Del Zanna  and
Vincenzo Andretta
Giulio Del Zanna
Affiliation:
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UK email: [email protected]
Vincenzo Andretta
Affiliation:
INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello, 16, I-80131, Napoli, Italy email: [email protected]
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Abstract

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We present measurements of the EUV spectral irradiance we have obtained from radiance measurements with the SOHO Coronal Diagnostic Spectrometer, from 1997 to date. We discuss the contribution of the various regions of the Sun to the total EUV irradiance, and how they varied dramatically between the last two solar minima. These observations allow us to interpret spectral irradiance measurements in the EUV which have been available since 2002 with the TIMED mission. We also briefly discuss how changes in various activity indices compare with the EUV spectral variability, and the limitations of spectral modelling.

Keywords

Sun: UV radiationSun: activitysolar-terrestrial relations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S264: Solar and Stellar Variability: Impact on Earth and Planets , August 2009 , pp. 78 - 80
Copyright
Copyright © International Astronomical Union 2010

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