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For a substorm 24 July 1998 PIXIE observes the onset and expansion during a perigee pass of the Polarsatellite. This gives an opportunity to follow the evolution of the onset and expansion phase, almoston a global scale with relatively high temporal resolution. The substorm is presented with multipleobservations throughout the magnetosphere. Following the onset of the substorm we observe a localisedregion of modulated energetic electron fluxes following the passage of the westward travelling surgein the pre-midnight region. We count at least six clear pulses with a period of approximately oneminute. Concurrent magnetic ground measurements show similar characteristics, almost simultaneouslywith the pulses in precipitation. We propose several possible mechanism for the pulsations, amongstthem the theory of modulated wave particle interaction first proposed by coroniti70

Pi2-pulsations observed in energetic electron precipitation and magnetic field in association with a substorm surge