Wavelength and direction filtering by magnetic measurements at satellite arrays: Generalized minimum variance analysis

Details Wavelength and direction filtering by magnetic measurements at satellite arrays: Generalized minimum variance analysis Wavelength and direction filtering by magnetic measurements at satellite arrays: Generalized minimum variance analysis

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...101.4961m&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A3, p. 4961-4966

Physics

34

Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Instruments And Techniques

Scientific paper

The main goal of the Cluster mission, consisting of four identical spacecraft, is the spatial resolution of plasma structures. For the determination of the wave vectors of a wave field from four positions, classical Fourier analysis is inappropriate. We develop a generalized minimum variance technique which gives a high wave vector resolution though the spatial grid is restricted to only a few sampling positions. This technique uses the amplitude and phase information of the magnetic field from the four satellite positions and determines the optimum wave field corresponding to the measured data. The components of the magnetic field are assumed to be normally distributed. The divergence-free nature of the magnetic field is used as a constraint. Using the magnetic data measured at four positions allows up to seven different wave vectors at one frequency to be uniquely resolved.

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