The sun's variable spectrum and its terrestrial effects

Details The sun's variable spectrum and its terrestrial effects The sun's variable spectrum and its terrestrial effects

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26at...20..467f&link_type=abstract

Astronomical and Astrophysical Transactions, vol. 20, Issue 3, pp.467-474

Astronomy and Astrophysics

Astronomy

1

Solar Irradiance, Global Warming, Solar Cycle, Solar Variability

Scientific paper

The solar radiation exhibits strong temporal variations not only in intensity but also in its spectrum which are linked to the evolution of the Sun through its magnetic activity cycle. The irradiance variability increases from longer to shorter wavelengths, with variations in the UV being orders of magnitude larger than those in the visible. While 99% of the total solar radiative output occurs at wavelengths longer than 300 nm, solar UV radiation accounts for up to 30% of the total variation. The continuous rise of the Earth's surface temperature over the last decades urgently raises a question about the physical origin of so-called global warming. A reliable estimate of the influence of human activity on the Earth's climate requires detailed knowledge about the natural sources of variability. One of the unknown boundary conditions for models of the evolution of the Earth's climate is the variation of the solar irradiance.

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