Magnetic field data acquired with the AMPTE Charge Composition Explorer satellite in the inner magnetosphere (L=2--5) often show Pi 2 pulsations whose waveforms match Pi 2 pulsations simultaneously observed on the ground at Kakioka (L=1.2). From a study of 25 such events, we find that the magnetic pulsations in the equatorial magnetosphere are dominated by poloidal-mode oscillations. The relative phase between the compressional component at CCE and the horizontal component at Kakioka is either near zero or near 180¿, with the ~180¿ lag observed only when the satellite is at L>3. This observation implies that there is a node of a radial standing wave at L>3. We argue that the nodal structure arises from reflection of MHD fast-mode waves at some inner boundary of the magnetosphere and discuss the relevance of the nodal structure to cavity-mode resonances and oscillations in the inner magnetosphere forced by a source wave external to the inner magnetosphere. ¿ American Geophysical Union 1992