Looking for non-axisymmetry in Saturn’s magnetic field and the implications for its rotation rate

Details Looking for non-axisymmetry in Saturn’s magnetic field and the implications for its rotation rate Looking for non-axisymmetry in Saturn’s magnetic field and the implications for its rotation rate

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p51f1181s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P51F-1181

Physics

Geophysics

[1595] Geomagnetism And Paleomagnetism / Planetary Magnetism: All Frequencies And Wavelengths, [3260] Mathematical Geophysics / Inverse Theory, [5734] Planetary Sciences: Fluid Planets / Magnetic Fields And Magnetism, [6275] Planetary Sciences: Solar System Objects / Saturn

Scientific paper

Using data from the Cassini spacecraft, we have sought new models of Saturn’s magnetic field that include non-axisymmetric components which are smooth in some defined sense. Previous solutions have not unambiguously resolved such components and have been limited to zonal harmonics up to degree 3. We analyse the models using resolution analysis, error analysis and spectral analysis. Our models have been derived using a regularized weighted linear least-squares estimation of model coefficients in which we estimated internal and external coefficients simultaneously. Our models are similar to previous models and while we consistently find non-axisymmetric features, our models' extra harmonics are not required since they do not significantly improve the fit to the data. We place an upper bound on the amount of non-axisymmetry in Saturn's magnetic field of ~5%. While small, we investigate whether the non-axisymmetric signature is sufficient to use in an autocorrelation timeseries analysis of the magnetic field measurements to infer a rotation rate directly from the internally generated magnetic field.

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