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Ann. Geophys., 22, 2633-2641, 2004
www.ann-geophys.net/22/2633/2004/
© European Geosciences Union 2004
Instantaneous local wave vector estimation from multi-spacecraft measurements using few spatial points
T. D. Carozzi, A. M. Buckley, and M. P. Gough
Space Science Centre, University of Sussex, Brighton, England
Abstract. We introduce a technique to determine instantaneous local properties of
waves based on discrete-time sampled, real-valued measurements
from 4 or more spatial points.
The technique is a generalisation to the spatial domain of the notion of
instantaneous frequency used in signal processing.
The quantities derived by our
technique are closely related to those used in geometrical optics,
namely the local wave vector and instantaneous phase velocity.
Thus, this experimental technique complements ray-tracing.
We provide example applications of the technique
to electric field and potential data from the EFW instrument on Cluster.
Cluster is the first space mission for which direct determination
of the full 3-dimensional local wave vector is possible, as described here.
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