Geomagnetic pulsations observed simultaneously on three geostationary satellites

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Abstract
Simultaneous observations of magnetic pulsations have been made by three geostationary satellites carrying similar magnetometers and so acting as an azimuthal array. Autospectral and cross‐spectral analysis yields coherence and phase differences between the pulsations at the satellite positions. The majority of the data fit the Kelvin‐Helmholtz generation mechanism. The azimuthal wave number changes sign near noon and corresponds to propagation away from noon. Usually, the wave number is E for the equatorial extent of the resonant region.