Statistics – Computation
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001kfnt...17..157k&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 17, no. 2, p. 157-165
Statistics
Computation
Scientific paper
The method based on analysis of mean motion of massive satellites is proposed to deduce rotation periods of giant planets. A computation of the so-called "resonance-spectrum" is applied for analysis of satellite frequencies. It is found that the Saturn's "dynamical" period is equal to 10.76± 0.15(h) . It agrees fairly well with the value 10.66(h) determined earlier by the Voyager-1 spacecraft (reflecting rotation of magnetic field of the planet), and thus gives a good check-up of the method. But the new period of Jupiter, 10.69±0.15(h) , significantly differs from the commonly accepted value ≈ 9.9(h) , determined also by the magnetic field rotation, or from radio-observations. It is concluded that periods of giant planets determined by variations of magnetic field, can not necessarily reflect rotation rate of the main gravitating body of a planet. The cause might be differential rotation of magnetosphere and magnetic field of a planet - the phenomenon analogous to differential rotation of magnetic field of the Sun.
Kotov Valerii A.
Kotova I. V.
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