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A regular period for Saturn’s magnetic field that may track its internal rotation Nature, Volume 441, Issue 7089, pp. 62-64 (2006)
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Saturn’s rotation is difficult to determine There is no solid surface from which to time it. The alternative ‘clock’—the magnetic field—is nearly symmetrically aligned with the rotation axis.
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Saturn is an intense radio emitter. The primary component of this radiation is called Saturn kilometric radiation (SKR). The radio rotation period is presumably that of the planet's magnetic field.
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Previous observations (the Saturnian kilometric radiation) Voyager 1 & 2 10 h 39 min 24 s +/- 7s Ulysses 10 h 39 min 22 s (the radio period is not constant) Cassini 10 h 45 min 45 s +/- 36 s The reasons for this shift are poorly understood.
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Cassini-Huygens mission Cassini-Huygens is a joint NASA/ESA/ASI space mission intended to study Saturn and its moons. launched on October 15, 1997 entered orbit on Jun. 30, 2004.
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These residuals are calculated by subtracting the estimated contribution of the internal planetary field and the external magnetodisk current sheet. Periodicity in Saturn’s magnetic field
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P =10 h 47 min 6 s +/- 40 s The power spectra of the residuals
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Conclusion the first accurate and direct measurement of Saturn’s magnetic field periodicity
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Thank you
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