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Lengths of grapewine sprouts, air temperatures and heliogeophysical factors from the point of view of chronobiology
Střeštík, Jaroslav ; Mikulecký, M.
Series of sunspot numbers, indices of geomagnetic activity, mean air temperature in April and grapewine lengths measured to the 24th April were processed by power spectra and mutual coherences. Whereas spectra of sunspot numbers exhibit a pronounced peak at 11 yr, in spectra of other quantities more significant peaks occur.

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