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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 12
Ann. Geophys., 26, 3641–3651, 2008
https://doi.org/10.5194/angeo-26-3641-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 26, 3641–3651, 2008
https://doi.org/10.5194/angeo-26-3641-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  19 Nov 2008

19 Nov 2008

Relationship between solar wind corotating interaction regions and the phasing and intensity of Saturn kilometric radiation bursts

S. V. Badman1, S. W. H. Cowley1, L. Lamy2, B. Cecconi2, and P. Zarka2 S. V. Badman et al.
  • 1Department of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UK
  • 2LESIA, Observatoire de Paris, Bâtiment 16, 5 Place Jules Janssen, 92195 Meudon, France

Abstract. Voyager spacecraft measurements of Saturn kilometric radiation (SKR) identified two features of these radio emissions: that they pulse at a period close to the planetary rotation period, and that the emitted intensity is correlated with the solar wind dynamic pressure (Desch and Kaiser, 1981; Desch, 1982; Desch and Rucker, 1983). In this study the inter-relation between the intensity and the pulsing of the SKR is analysed using Cassini spacecraft measurements of the interplanetary medium and SKR over the interval encompassing Cassini's approach to Saturn, and the first extended orbit. Cassini Plasma Spectrometer ion data were only available for a subset of the dates of interest, so the interplanetary conditions were studied primarily using the near-continuously available magnetic field data, augmented by the ion moment data when available. Intense SKR bursts were identified when solar wind compressions arrived at Saturn. The intensity of subsequent emissions detected by Cassini during the compression intervals was variable, sometimes remaining intense for several planetary rotations, sometimes dimming and rarely disappearing. The timings of the initial intense SKR peaks were sometimes independent of the long-term pulsing behaviour identified in the SKR data. Overall, however, the pulsing of the SKR peaks during the disturbed intervals was not significantly altered relative to that during non-compression intervals.

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