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Observations of Pi2 pulsations at middle and low latitudes have beenexplained in terms of cavity mode resonances, whereas transients associatedwith field-aligned currents appear to be responsible for the high latitudePi2 signature.Data from Cluster are used to study a Pi2 event observed at 18:09 UTC on21 January 2003, when three of the satellites were within the plasmasphere(L=4.7, 4.5 and 4.6) while the fourth was on the plasmapauseor in the plasmatrough (L=6.6). Simultaneous pulsations atground observatories and the injection of particles at geosynchronous orbitcorroborate the occurrence of a substorm.Evidence of a cavity mode resonance is established by considering the phaserelationship between the orthogonal electric and magnetic field componentsassociated with radial and field-aligned standing waves. The relative phasebetween satellites located on either side of the geomagnetic equatorindicates that the field-aligned oscillation is an odd harmonic. Finiteazimuthal Poynting flux suggests that the cavity is effectively open endedand the azimuthal wave number is estimated as m~13.5

Evidence of standing waves during a Pi2 pulsation event observed on Cluster