Actually, in hindsight it may not have been a surprise, because for Jupiter we have a system 1, 2 and 3 coordinate system (and an on-againg off-again system 4). System 1 and 2 describe the rotation period of the gas planet at different latitudes:
system I, equatorial clouds: 9h 50m 30.00s = 9.842 hours
system II, circumpolar clouds: 9h 55m 40.63s = 9.928 hours
system III, magnetic field: 9h 55m 29.71 s = 9.925 hours
So it all depends where and how you measure. But if Dessler says it is significant, then I will believe him, he is a great expert.
Another nice thing about the Kronian magnetic field is that it is almost perfectly dipolar!!
Cassini is going to be soooo much fun, too bad I am not working on that project at the moment
Martin

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善數, 不用籌策 (shàn shù, bù yòng chóu cè)
He who is good at counting, uses no counting tools
“A good scientist has freed himself of concepts and keeps his mind open to what is”
道德經, 二十七 (dào dé jīng, 27)