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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 1
Ann. Geophys., 26, 77–86, 2008
https://doi.org/10.5194/angeo-26-77-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 26, 77–86, 2008
https://doi.org/10.5194/angeo-26-77-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  04 Feb 2008

04 Feb 2008

Parameterization of ionization rate by auroral electron precipitation in Jupiter

Y. Hiraki1 and C. Tao2 Y. Hiraki and C. Tao
  • 1Graduate School of Energy Science, Kyoto University, Uji, Japan
  • 2Department of Geophysics, Tohoku University, Sendai, Japan

Abstract. We simulate auroral electron precipitation into the Jovian atmosphere in which electron multi-directional scattering and energy degradation processes are treated exactly with a Monte Carlo technique. We make a parameterization of the calculated ionization rate of the neutral gas by electron impact in a similar way as used for the Earth's aurora. Our method allows the altitude distribution of the ionization rate to be obtained as a function of an arbitrary initial energy spectrum in the range of 1–200 keV. It also includes incident angle dependence and an arbitrary density distribution of molecular hydrogen. We show that there is little dependence of the estimated ionospheric conductance on atomic species such as H and He. We compare our results with those of recent studies with different electron transport schemes by adapting our parameterization to their atmospheric conditions. We discuss the intrinsic problem of their simplified assumption. The ionospheric conductance, which is important for Jupiter's magnetosphere-ionosphere coupling system, is estimated to vary by a factor depending on the electron energy spectrum based on recent observation and modeling. We discuss this difference through the relation with field-aligned current and electron spectrum.

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