The free core nutation period stays between 431 and 434 sidereal days

Details The free core nutation period stays between 431 and 434 sidereal days The free core nutation period stays between 431 and 434 sidereal days

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..131r&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 1, p. 131-134

Physics

10

Geodesy And Gravity: Earth'S Interior-Dynamics, Geodesy And Gravity: Reference Systems, Geodesy And Gravity: Rotational Variations

Scientific paper

We determine the parameters of the Free Core Nutation (FCN) from the resonance induced in the forced nutations by a least-squares analysis of VLBI observations. By applying the procedure to consecutive observation series, we deduce the time evolution of the FCN period, and show that it varies only between 431 and 434 sidereal days. These bounds are within the limits of uncertainty arising from noise in the data. We therefore find no evidence for time variation of the FCN period.

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