Spectral characteristic of mid-term quasi-periodicities in sunspot data

  title={Spectral characteristic of mid-term quasi-periodicities in sunspot data},
  author={Peter Frick and Dmitrij Sokoloff and R. Stepanov and Valery V. Pipin and I. Usoskin},
  • Peter Frick, Dmitrij Sokoloff, +2 authors I. Usoskin
  • Published 2019
  • Physics
  • Numerous analyses suggest the existence of various quasi-periodicities in solar activity. The power spectrum of solar activity recorded in sunspot data is dominated by the $\sim$11-year quasi-periodicity, known as the Schwabe cycle. In the mid-term range (1 month -- 11 years) a pronounced variability known as a quasi-biennial oscillation (QBO) is widely discussed. In the shorter time scale a pronounced peak, corresponding to the synodic solar rotation period ($\sim$ 27 days) is observed. Here… CONTINUE READING

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