Variation of the 11-yr and the 22-yr solar cycles associated with long-term solar variations

Details Variation of the 11-yr and the 22-yr solar cycles associated with long-term solar variations Variation of the 11-yr and the 22-yr solar cycles associated with long-term solar variations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh21a0329m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH21A-0329

Physics

1150 Cosmogenic-Nuclide Exposure Dating (4918), 2104 Cosmic Rays, 3305 Climate Change And Variability (1616, 1635, 3309, 4215, 4513), 7536 Solar Activity Cycle (2162), 7974 Solar Effects

Scientific paper

In this paper, we report the variation of solar cycle length during the last 1200 years revealed by the measurements of radiocarbon content in tree-rings. We also discuss the influence of solar variations on terrestrial climate. Radiocarbon is one of the cosmogenic nuclides, which enable us to reconstruct solar variations in the past. Cosmogenic isotopes are produced in the earth's atmosphere mainly by the galactic cosmic rays, which are modulated by solar wind and the interplanetary magnetic field. Generally, intense solar activity results in a decrease of the production rate of radiocarbon, while weakening of solar activity brings an increase. We have measured the radiocarbon content in Japanese cedar tree-rings with annual time resolution and have studied on the variation of solar cycle length since the 9th century. As a result, drastic changes of solar cycles associated with long-term solar variations were detected. Those signals were also found in the temperature variations obtained by tree-ring width analyses, and the persistent solar influence on climate on the decadal time scale was confirmed. In this paper, we will also discuss the possibility of space climate forecast.

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