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Mechanisms for total and spectral solar irradiance variations

Published online by Cambridge University Press:  26 February 2010

Margit Haberreiter*
Affiliation:
Laboratory for Atmospheric and Space Physics, University of Colorado, 1234 Innovation Drive, Boulder, CO, 80303, USA email: haberreiter@lasp.colorado.edu
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Abstract

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The total and spectral irradiance varies over short time scales, i.e. from days to months, and longer time scales from years to decades, centuries, and beyond. In this talk we review the current understanding of irradiance changes from days to decades. We present the current status of observations and discuss proposed reconstruction approaches to understand these variations. The main question that ultimately needs to be answered is what are the physical processes that could explain the enhanced heating of the photosphere, chromosphere, transition region, and corona, leading to a change in the solar radiative output at various wavelengths. As semi-empirical models allow us to reproduce the solar spectrum over a broad wavelength range, they offer a powerful tool to determine the energy necessary to heat certain layers and at the same time balance the radiative losses.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

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