FCN

(redirected from Free Core Nutation)
AcronymDefinition
FCNFunction
FCNFaith Community Nurse
FCNFile Concatenation
FCNFinal Call News (publishing)
FCNFootball Club Nantes (French football club; Nantes, France)
FCNFox Cable Networks
FCNFederation of Canadian Naturists
FCNFrente Convergencia Nacional (Spanish: National Convergence Front; Guatemala)
FCNFamily and Corrections Network (est. 1983)
FCNFree Core Nutation
FCNFirst Coast News (Florida)
FCNFederal Communicators Network
FCNFootball Club Nueillaubiers (French football club)
FCNFußball Club Nürnberg (Germany)
FCNFlorida Center for Nursing
FCNFairfax Community Newspapers (Australia)
FCNField Change Notice
FCNFaith Community Network
FCNFinancial Control Number (medical insurance)
FCNFibre Channel Name
FCNFile Change Notification
FCNFully-Connected Network
FCNFunabashi Cable Network (Japan)
FCNFunny Class Notes
FCNForce Change Now
FCNFootball Club Nordsjælland (Danish soccer team)
FCNFraction of Commercial Power Supplied by Nuclear
FCNFlorida Certified Negotiator
References in periodicals archive ?
Lambert, S.B.: 2006, Atmospheric excitation of the Earth's free core nutation. A&A, 457, 717-720.
and Malkin, Z.: 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 429.8-430.5 solar days in case in the period, and 17000-22000 in case of the quality factor.
Roosbeek, F., Defraigne, P., Feissel, M., and Dehant, V.: 1999, The free core nutation period stays between 431 and 434 sidereal days.
and Ron, C.: 2006b, Resonance effects and possible excitation of Free Core Nutation. In: A.
We demonstrated that all VLBI solutions yield similarly varying values of estimated period P and quality factor Q of Free Core Nutation. The agreement among different IVS analysis centers is very good, the differences do not exceed their formal uncertainties.
Here [e.sub.R] denotes the dynamical ellipticity of the rigid Earth used to compute the rigid solution, [N.sub.0], [Q.sub.j] are complex constants, and [s.sub.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. In celestial frame and complex notation it reads
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. The numerical integration yields both amplitudes and phases of the free motion comparable to the observations, even in the interval almost 25 years long.
and Petrov, S.D.: 1999, Observational evidence of the free core nutation and its geophysical excitation.
Florsch, N., and Hinderer, J.: 2000, Bayesian estimation of the free core nutation parameters from the analysis of the precise tidal gravity data.