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Ann. Geophys., 26, 1699-1710, 2008
www.ann-geophys.net/26/1699/2008/
© European Geosciences Union 2008
The wave surveyor technique for fast plasma wave detection in multi-spacecraft data
J. Vogt1, Y. Narita2, and O. D. Constantinescu2
1School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany
2Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany
Abstract. Multi-satellite missions like Cluster allow to study the full
spatio-temporal variability of plasma processes in near-Earth space,
and both the frequency and the wave vector dependence of dispersion
relations can be reconstructed. Existing wave analysis methods
include high-resolution beamformers like the wave telescope or
k-filtering technique, and the phase differencing approach
that combines the correlations measured at pairs of sensors of
the spacecraft array. In this paper, we make use of the
eigendecomposition of the cross spectral density matrix
to construct a direct wave identification method
that we choose to call the wave surveyor technique.
The analysis scheme extracts only the dominant wave mode but
is much faster to apply than existing techniques, hence it is
expected to ease survey-type detection of waves in large data
sets. The wave surveyor technique is demonstrated by means of
synthetic data, and is also applied to Cluster magnetometer
measurements.
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