The paper presents studies of periods in the range of 10-300 min in time series of fluctuations of processes of various nature. The research data made it possible to identify a spectrum of periods, repeating in the studied time series, including those of biological origin. The work discusses further studies of this spectrum, as well as its coincidence with circahoralian rhythms, which, as has been demonstrated in the course of more than half a century of their research, are present in the dynamics of almost any biological systems. Such a coincidence, in our opinion, indicates an external nature of circahoralian rhythms synchronizer.
circahoralian periods, universal spectrum of periods, fluctuations, synchronization
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