Refinements of the polar motion frequency modulation hypothesis

Details Refinements of the polar motion frequency modulation hypothesis Refinements of the polar motion frequency modulation hypothesis

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7025c&link_type=abstract

Journal of Geophysical Research, vol. 87, Aug. 10, 1982, p. 7025-7028.

Physics

Geophysics

4

Geophysics, Polar Wandering (Geology), Amplitude Modulation, Frequency Modulation

Scientific paper

Reference is made to the suggestion by Carter (1981) that the Chandler component of polar motion may be frequency modulated as a function of the instantaneous polar motion magnitude. A composite of observational records compiled by Chandler (1901) and the International Latitude Service series is seen as suggesting a variation in the magnitude at a frequency of approximately 0.0118 cycles per year (cpy). The spectrum produced by the resulting frequency modulation here would depend on the modulation index. A comparison of spectra synthesized with various degrees of frequency modulation and those derived from observational data indicate a frequency increase of 0.15 to 0.30 cpy/arc sec decrease in the polar motion magnitude. It is pointed out that this degree of frequency modulation would cause 'splitting' of the Chandler component, producing dual spectral peaks at periods of 427 and 439 days.

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