Physics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..165w&link_type=abstract
In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze
Physics
3
Solar Irradiance, Solar Cycles
Scientific paper
The solar vacuum ultraviolet (VUV) radiation at wavelengths shortward of 200 nm is a primary energy source for planetary atmospheres. For such aeronomic studies, accurate values of the solar VUV irradiance are needed over time periods of minutes to decades. A summary of the solar VUV irradiance measurements and their variability during the SOHO mission is presented, along with an overview of empirical and physical models of the solar VUV irradiance. One of the most significant, recent solar irradiance results is that the irradiance below 20 nm is as much as a factor of 4 higher than the reference Atmospheric Explorer E (AE-E) spectra established in the 1970s. The primary long-term variability is related to the solar dynamo and is known best by the 11-year sunspot cycle. The solar cycle variability as a function of wavelength can be characterized as 10% to 50% between 200 and 120 nm, 20% to 70% between 120 and 65 nm and as a factor of 1.5 to 10 between 65 and 1 nm.
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