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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 10
Ann. Geophys., 24, 2441–2444, 2006
https://doi.org/10.5194/angeo-24-2441-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 2441–2444, 2006
https://doi.org/10.5194/angeo-24-2441-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  20 Oct 2006

20 Oct 2006

Propagation pattern of low frequency waves in the terrestrial magnetosheath

Y. Narita and K.-H. Glassmeier Y. Narita and K.-H. Glassmeier
  • Institut für Geophysik und extraterrestrische Physik, Mendelssohnstr. 3, D-38106 Braunschweig, Germany

Abstract. Propagation pattern (distribution of phase velocities) is determined in three dimensions in the terrestrial magnetosheath on a statistical basis using Cluster spacecraft observations. It is found that the anti-sunward propagation dominates and that the propagation direction is toward the magnetosheath flank at smaller zenith angles, while it is toward the magnetopause at larger angles. This pattern is axially symmetric regardless of the interplanetary magnetic field direction and agrees qualitatively with the density gradient directions in a hydromagnetic flow model of the magnetosheath, suggesting that the wave refraction mechanism is more significant than the wave drift effect.

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