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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 28, issue 6
Ann. Geophys., 28, 1289–1297, 2010
https://doi.org/10.5194/angeo-28-1289-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 1289–1297, 2010
https://doi.org/10.5194/angeo-28-1289-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Jun 2010

14 Jun 2010

Simulation of mode conversion process from upper-hybrid waves to LO-mode waves in the vicinity of the plasmapause

M. J. Kalaee1, Y. Katoh1, A. Kumamoto2, T. Ono1, and Y. Nishimura3 M. J. Kalaee et al.
  • 1Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
  • 2Planetary plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University, Sendai, Japan
  • 3Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan

Abstract. In order to clarify the role of the mode conversion process in the generation mechanism of LO-mode waves in the equatorial region of the plasmasphere, we have investigated the linear mode conversion process among upper-hybrid-resonance (UHR)-mode, Z-mode and LO-mode waves by a numerical simulation solving Maxwell's equations and the equation of motion of a cold electron fluid. The wave coupling process occurring in the cold magnetized plasma are examined in detail. In order to give a realistic initial plasma condition in the numerical experiments, we use initial parameters inferred from observation data obtained around the generation region of LO-mode waves obtained by the Akebono satellite. A density gradient is estimated from the observed UHR frequency, and wave normal angles are estimated from the dispersion relation of cold plasma by comparing observed wave electric fields. Then, we perform numerical experiments of mode conversion processes using the density gradient of background plasma and the wave normal angle of incident upper hybrid mode waves determined from the observation results. We found that the characteristics of reproduced LO-mode waves in each simulation run are consistent with observations.

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