Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21b..03p&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH21B-03
Physics
1650 Solar Variability, 7524 Magnetic Fields, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance, 7549 Ultraviolet Emissions
Scientific paper
In this paper we show the recent results on total solar and UV irradiance variations and their relation to solar magnetic activity over solar cycles 21 to 23. Comparison of the multi-decade long irradiance and magnetic field measurements indicates that the shape and magnitude of irradiance variations are different from that of magnetic indices. Specifically, while magnetic indices show that solar cycle 23 is weaker than the two previous cycles, the long-term variation of total solar irradiance over solar cycles 21 to 23 is rather symmetrical, showing that its maximum and minimum levels were about the same within their measuring uncertainties. In this paper we address the questions: (1) is there a strict linear relationship between solar variability and irradiance variations; (2) what is the role of polar magnetic fields in irradiance changes; (3) is there a significant non-magnetic component in the observed irradiance variations? The results presented in this paper underscore the need to further develop new analysis techniques to determine whether there is a secular variation in solar irradiance over years to decades - a necessary step to study and predict the climate impact of solar variability.
Arge Charles
Floyd Linton
Jones Heath
Pap Judit M.
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