| Volumes and Issues Contents of Issue 11 |
www.ann-geophys.net/26/3389/2008/
© European Geosciences Union 2008
Evaluation of bispectrum in the wave number domain based on multi-point measurements
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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Citation: Narita, Y., Glassmeier, K.-H., Décréau, P. M. E., Hada, T., Motschmann, U., and Nariyuki, Y.: Evaluation of bispectrum in the wave number domain based on multi-point measurements, Ann. Geophys., 26, 3389-3393, 2008. Bibtex EndNote Reference Manager
