Search for evidence of a clock related to the solar 154 day complex of periodicities

Details Search for evidence of a clock related to the solar 154 day complex of periodicities Search for evidence of a clock related to the solar 154 day complex of periodicities

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397..337s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 337-346.

Astronomy and Astrophysics

Astrophysics

30

Solar Activity, Solar Rotation, Spectrum Analysis, Spherical Harmonics, Sunspots, Nyquist Frequencies, Orbital Mechanics, Oscillators, Power Spectra, Solar Maximum Mission

Scientific paper

Evidence indicates that the 154-day periodicity in solar activity may be part of a complex of periodicities that are approximate multiples of 25.8 d, which suggests that the sun contains a 'clock' with frequency in the range 440-463 nHz. To search for evidence of this clock, the daily Greenwich sunspot areas and daily Zurich sunspot numbers have been Fourier-analyzed. The Zurich data show a strong peak that may clearly be identified with the fundamental frequency, while the Greenwich data show a peak that may be the harmonic of the fundamental frequency. A model is discussed which provides a kinematical interpretation of the sunspot spectrum.

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