Abstract
We propose that the origin and behavior of the internal magnetic fields of Jupiter and Saturn should be much like the Sun's. Jupiter and Saturn are predominantly gaseous, they have significant internal heat sources, and their surface angular rotation rates vary with latitude. There is also empirical evidence showing that the rotation rates of their magnetic fields vary with latitude. This differential rotation is instrumental in producing solar-type dynamos, which are characterized by quasi-periodic field reversals. When we apply the theory and scaling parameters for the reversal period of the magnetic field of the Sun to Jupiter and Saturn, we derive an estimate for the time interval between magnetic reversals to be on the order of centuries. This time scale is consistent with observed changes in Jupiter's magnetic field over the last 2 decades.
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