How does the magnetic cycle change radiance and irradiance of the Sun?

Physics

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Solar Irradiance, Solar Magnetic Field

Scientific paper

The Sun's magnetic field, which is concentrated into flux tubes in the photosphere, affects the radiance. Depending on the size of a flux tube it radiates more (for slender tubes) or less (for broad tubes) strongly than the quiet Sun. The Sum of all magnetic features on the whole solar disc affects the Sun's irradiance. As the number and the size distribution of the flux tubes changes over the solar cycle it produces a variation of total irradiance, which is very similar to the observed variation. There is also evidence that the Sun's magnetic field exhibits a secular variation, which is expected to produce a slow irradiance change, whose amplitude is expected to be larger than the cyclic variation. In this review some of the relevant processes taking place in flux tubes are pointed out and models describing the irradiance variations over the solar cycle based on the Sun's magnetic field are discussed. Finally, the results of the modelling of the secular variation of the Sun's magnetic field are presented.

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