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Modulation of Saturn’s radio clock by solar wind speed

Author

Listed:
  • 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)

  • Laurent Lamy

    (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)

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.

Suggested Citation

  • Philippe Zarka & Laurent Lamy & Baptiste Cecconi & Renée Prangé & Helmut O. Rucker, 2007. "Modulation of Saturn’s radio clock by solar wind speed," Nature, Nature, vol. 450(7167), pages 265-267, November.
    • Handle: RePEc:nat:nature:v:450:y:2007:i:7167:d:10.1038_nature06237
    DOI: 10.1038/nature06237
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