A damped oscillator model of the 50-day oscillation in the length of the day

Details A damped oscillator model of the 50-day oscillation in the length of the day A damped oscillator model of the 50-day oscillation in the length of the day

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987acasn..28...29l&link_type=abstract

(Acta Astronomica Sinica, vol. 28, no. 1-4, 1987, p. 29-38) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 12, March

Physics

3

Atmospheric Physics, Diurnal Variations, Harmonic Oscillation, Periodic Variations, Angular Momentum, Autoregressive Processes, Power Spectra, Time Series Analysis, Very Long Base Interferometry

Scientific paper

The changes in the length of day with periods near 50 days appear to be driven by resonance in the atmospheric angular momentum. A damped harmonic oscillator model characterized by a resonance period and a Q-factor is used to describe this behavior. Estimates of the period and Q have been obtained by fitting autoregressive and autoregressive moving-average time series models to the length of day and atmospheric angular-momentum data. Estimates of the period near 50 days were obtained, but a precise value is probably unobtainable because the low Q value indicates that the degree of resonance is slight.

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