2007, Empiric models of the Earth's free core nutation.
2005, Detection of phase disturbances of free core nutation of the Earth and their concurrence with geomagnetic jerks.
The quasi-periodic variations of estimated period P and quality factor Q of Free Core Nutation keep within the limit of 429.
2000, Are the free core nutation parameters variable in time?
1999, The free core nutation period stays between 431 and 434 sidereal days.
2006b, Resonance effects and possible excitation of Free Core Nutation.
j] are four complex resonance frequencies corresponding to Chandler Wobble (CW, with terrestrial period of about 435 days), RFCN, with celestial period of about 430 days, Prograde Free Core Nutation (PFCN, with celestial period of about 1020 days) and Inner Core Wobble (ICW, with terrestrial period of about 2400 days) respectively.
In order to solve theoretically the rotation of non-rigid Earth model, Brzezinski (1994) proposed so called broad-band Liouville equations, that take into consideration two main resonances--Chandler wobble and Free core nutation.
Atmospheric pressure term with inverted barometer correction (a simple oceanic model), combined with wind effects is sufficiently large to excite the observed free core nutation.
j] are four complex resonance frequencies corresponding to Chandler Wobble (CW), RFCN, Prograde Free Core Nutation (PFCN) and Inner Core Wobble (ICW) respectively.
1999, Observational evidence of the free core nutation and its geophysical excitation.
2000, Bayesian estimation of the free core nutation parameters from the analysis of the precise tidal gravity data.