Elucidation of the Active Geosphere. Kyoto University Acvtive Geosphere investigations for the 21st century COE Program
The tree rings recorded in Cretaceous (140 million years ago) indicate 11-year sunspot cycle in the growth ring widths detected by auto-correlation analysis.
The 11-year solar activity cycle is the same as that of the present sun.
Well-preserved cells form the early- and late-woods shows the existence of seasons and climatic zones.
Credit: Prof. Fujio MASUDA [Kyoto University]
( 2003-10-14 )
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