Saturn's internal planetary magnetic field
Article first published online: 23 DEC 2010
Copyright 2010 by the American Geophysical Union.
Geophysical Research Letters
Volume 37, Issue 24, December 2010
How to Cite
2010), Saturn's internal planetary magnetic field, Geophys. Res. Lett., 37, L24105, doi:10.1029/2010GL045148., , and (
- Issue published online: 23 DEC 2010
- Article first published online: 23 DEC 2010
- Manuscript Accepted: 15 NOV 2010
- Manuscript Revised: 1 NOV 2010
- Manuscript Received: 30 AUG 2010
 A model of Saturn's internal planetary magnetic field based on data from the Cassini prime mission has been derived. In the absence of a determination of the rotation rate, the model is constrained to be axisymmetric. Non-axisymmetric models for a range of plausible planetary rotation periods have also been derived and we evaluate upper limits on the asymmetry of the internal magnetic field based on those models. We investigate whether a maximum in the non-axisymmetric magnetic field can be identified at a particular rotation rate thus providing insight into the rotation rate of the planet's interior. No such peak can unambiguously be identified. An axisymmetric octupole model is adequate to fit the data and addition of higher order terms does not improve the goodness of fit. The largest value of the dipole tilt obtained from non-axisymmetric models (<0.1°) confirm the high degree of symmetry of Saturn's magnetic field.