Solar maximum epoch imprints in tree-ring width from Passo Fundo, Brazil (1741 2004)

Details Solar maximum epoch imprints in tree-ring width from Passo Fundo, Brazil (1741 2004) Solar maximum epoch imprints in tree-ring width from Passo Fundo, Brazil (1741 2004)

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jastp..70.1025r&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, vol. 70, issue 7, pp. 1025-1033

Physics

3

Tree-Ring Data, Solar Maximum, Solar Minimum, Spectral And Wavelet Analysis

Scientific paper

A tree-ring thickness time series from Passo Fundo (Southern Brazil) for the interval 1741-2004 was studied by spectral, wavelet and cross-wavelet analyses in order to identify the non-stationary characteristics in tree-ring and sunspot number data. Periods corresponding to the solar cycles of 11, 22, and 80 yr were found. The 11 yr solar cycle is detected in tree-ring data only during maximum solar activity interval from 1764 to 1804, 1824 to 1884, and 1924 to 1984. The Hale 22 yr solar cycle was observed in tree-ring wavelet map for the 1764-1864 and 1904-2004 intervals. The Gleissberg solar cycle was also observed in tree-ring wavelet map for the 1844-1904 interval.

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