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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 11
Ann. Geophys., 26, 3389–3393, 2008
https://doi.org/10.5194/angeo-26-3389-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 26, 3389–3393, 2008
https://doi.org/10.5194/angeo-26-3389-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  24 Oct 2008

24 Oct 2008

Evaluation of bispectrum in the wave number domain based on multi-point measurements

Y. Narita1, K.-H. Glassmeier1, P. M. E. Décréau2, T. Hada3, U. Motschmann4, and Y. Nariyuki5 Y. Narita et al.
  • 1Institut für Geophysik und extraterrestrische Physik, Mendelssohnstr. 3, 38106 Braunschweig, Germany
  • 2LPCE/CNRS and Université d'Orléans, Orléans, France
  • 3Department of Earth System Science and Technology, Kyushu University, 816-8580, Kasuga, Fukuoka, Japan
  • 4Institut für Theoretische Physik, Mendelssohnstr. 3, 38106 Braunschweig, Germany
  • 5Department of electrical engineering, Kochi National College of Technology, Monobe-Otsu 200-1, Nankoku, Kochi 783-8508, Japan

Abstract. We present an estimator of the bispectrum, a measure of three-wave couplings. It is evaluated directly in the wave number domain using a limited number of detectors. The ability of the bispectrum estimator is examined numerically and then it is applied to fluctuations of magnetic field and electron density in the terrestrial foreshock region observed by the four Cluster spacecraft, which indicates the presence of a three-wave coupling in space plasma.

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