期刊
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
卷 250, 期 -, 页码 31-34出版社
ELSEVIER
DOI: 10.1016/j.pepi.2015.11.002
关键词
Saturn magnetic field; Secular variation; Numerical dynamo model; Planetary magnetism
资金
- NSERC
- Canada Research Chairs Program
- NASA
Saturn's nearly axisymmetric magnetic field poses a problem for dynamo theory, requiring that a special mechanism operates to axisymmetrize the field. The leading explanation is that zonal flows in a stably stratified layer surrounding the dynamo source region attenuate the non-axisymmetric components of the field. Here we demonstrate an important theoretical consequence of this axisymmetrization process: the secular variation of the field components must be extremely slow. Observational evidence suggests this may indeed be the case for Saturn. In addition, we present numerical dynamo simulations that reproduce the observed axisymmetry of Saturn's field and confirm the extremely slow secular variation rates in highly axisymmetric models. A consequence of this result is that we can use time variation of the axisymmetric field to learn about the non-axisymmetric field components which are not observed in present data from Cassini. (C) 2015 Elsevier B.V. All rights reserved.
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