Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh31c..03l&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH31C-03
Physics
2104 Cosmic Rays, 7524 Magnetic Fields, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance
Scientific paper
Recent reconstructions of variations in the total solar irradiance (TSI) over the last 300 years are similar in form to the variations of cosmogenic isotope abundances and the inferred variation of the open solar flux over the same interval. These reconstructions show a century-scale drift in TSI which is comparable in magnitude to the amplitude of recent solar cycle changes, namely of order 1 W m-2. In addition, strong links between paleoclimate records and cosmogenic isotopes have been found. These results also suggest a link between open solar flux and total solar irradiance. Modelling of the evolution of emerged flux by Wang et al. (2002) reproduces the inferred large changes (by a factor of order 2) in the open solar flux on century timescales, explaining the changes in cosmic ray fluxes and hence cosmogenic isotope abundance: however, this modelling also suggests that this is not associated with significant change in the photospheric magnetic flux, which modulates TSI on 11-year timescales. Thus the changes in the open flux and cosmogenic isotopes do not appear to be linked to the 100-year drift in TSI. The long-term variation in open flux has been shown to be associated with changes in the heliographic latitude of active regions and we show that the contribution of active region faculae to the TSI has changed by 0.2 W m-2 in the past 100 years because of the directional characteristics of the excess radiation from faculae. This suggests that small flux tubes of the "extended solar cycle", and any long-term change in their latitudes, could also have made a significant contribution to the long-term drift in TSI .
Foster Simon
Lockwood Marian
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