Quasi-biennial oscillation in sunspot activity

Details Quasi-biennial oscillation in sunspot activity Quasi-biennial oscillation in sunspot activity

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985baicz..36...97a&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 36, no. 2, 1985, p. 97-102.

Astronomy and Astrophysics

Astronomy

17

Secular Variations, Solar Activity, Sunspots, Autocorrelation, Bandpass Filters, Demodulation, Power Spectra, Solar Oscillations, Time Series Analysis

Scientific paper

A 233-year series of monthly means of relative sunspot numbers for the period 1749 - 1981 is analysed. Different statistical methods are used: autocorrelation power spectrum and complex demodulation analysis. It is found that there exists a quasi-biennial oscillation with a basic period of 25.6 months. The lifetime of the quasi-biennial oscillation is one solar cycle and contains five cycles of oscillations and, for most solar cycles, the oscillation is formed at the beginning of the solar cycle and is destroyed at the end. The time variations of amplitude and oscillation period during the solar cycle are analysed as well.

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