Physics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3116701g&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 16, CiteID L16701
Physics
12
Planetology: Fluid Planets: Interiors (8147), Planetology: Fluid Planets: Magnetic Fields And Magnetism, Planetology: Fluid Planets: Magnetospheres (2756), Planetology: Solar System Objects: Saturn
Scientific paper
Analysis of magnetic field data from the Pioneer 11, Voyager 1 and Voyager 2 spacecraft produced the first models of Saturn's internal field. One striking feature of these models is the lack of non axisymmetric terms, which poses strong constraints on the dynamo mechanism. Resolution of the internal field using magnetic field data from different epochs is complicated by the uncertainty in our knowledge of the planetary rotation rate. By reanalyzing the flyby data, using modern inversion techniques, we derive the first tentative direct measurement of the rotation rate of the magnetic field. The measured rotation period agrees within 0.6 s with the value obtained from remote radio emission measurements, and its uncertainty is reduced to +/-2.4 s. From an inversion of all available magnetic field data, we conclude that it is premature to exclude the presence of non-axisymmetric terms when describing the internal planetary field, and in particular we find a significant dipole tilt of 0.17°.
Dougherty K. M. K. M.
Giampieri Giacomo
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