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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 28, issue 4
Ann. Geophys., 28, 1013–1021, 2010
https://doi.org/10.5194/angeo-28-1013-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 1013–1021, 2010
https://doi.org/10.5194/angeo-28-1013-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  27 Apr 2010

27 Apr 2010

Source mechanism of Saturn narrowband emission

J. D. Menietti1, P. H. Yoon2,3, Sheng-Yi Ye1, B. Cecconi4, and A. M. Rymer5 J. D. Menietti et al.
  • 1Dept. of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
  • 2Institute for Physical Science and Technology, University of Maryland, College Park, MD, USA
  • 3School of Space Research, Kyung Hee University, Yongin, Gyeonggi 446-701, Korea
  • 4LESIA-CNRS, Observatoire de Paris, Meudon, France
  • 5Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA

Abstract. Narrowband emission (NB) is observed at Saturn centered near 5 kHz and 20 kHz and harmonics. This emission appears similar in many ways to Jovian kilometric narrowband emission observed at higher frequencies, and therefore may have a similar source mechanism. Source regions of NB near 20 kHz are believed to be located near density gradients in the inner magnetosphere and the emission appears to be correlated with the occurrence of large neutral plasma clouds observed in the Saturn magnetotail. In this work we present the results of a growth rate analysis of NB emission (~20 kHz) near or within a probable source region. This is made possible by the sampling of in-situ wave and particle data. The results indicate waves are likely to be generated by the mode-conversion of directly generated Z-mode emission to O-mode near a density gradient. When the local hybrid frequency is close n fce (n is an integer and fce is the electron cyclotron frequency) with n=4, 5 or 6 in our case, electromagnetic Z-mode and weak ordinary (O-mode) emission can be directly generated by the cyclotron maser instability.

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