E. Nesmeribes et al., WAVELET ANALYSIS OF THE MAUNDER MINIMUM A S RECORDED IN SOLAR DIAMETER DATA, Comptes rendus de l'Academie des sciences. Serie II. Mecanique, physique, chimie, astronomie, 321(12), 1995, pp. 525-532
Historical diameters and sunspot group numbers observed by French astr
onomers from 1660 to 1719 exhibit 11-y-oscillations. The diameter osci
llations and their amplitude are anti-correlated with the sunspot grou
p number (the Schwabe cycle). This peculiar feature is consistent with
modern diameter and sunspot acitivity data.