Modulation of Saturn’s radio clock by solar wind speed

Philippe Zarka (), Laurent Lamy, Baptiste Cecconi, Renée Prangé and Helmut O. Rucker
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Philippe Zarka: Laboratoire d’Études Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris, Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Université Paris Diderot
Baptiste Cecconi: Laboratoire d’Études Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris, Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Université Paris Diderot
Renée Prangé: Laboratoire d’Études Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris, Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Université Paris Diderot
Helmut O. Rucker: Space Research Institute, Austrian Academy of Sciences, A-8042 Graz, Austria

Nature, 2007, vol. 450, issue 7167, 265-267

Abstract: Saturn's rotational enigma The rotation period of giant planets is usually determined from radio emissions. But things get complicated at Saturn, where the radio period, like the magnetospheric magnetic field, fluctuates by about plus or minus 1% over years. The nature of these variations is a major enigma of the Cassini era. Now rapid fluctuations of this period have been discovered, lasting 20 to 30 days. They seem to be related to variations in solar wind velocity, suggesting that the solar wind has a significant influence on Saturn's magnetosphere. If the full extent of this effect can be determined, it may be possible to establish Saturn's true rotation period accurately.

Date: 2007
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DOI: 10.1038/nature06237

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