Spatial phase and amplitude structures of the morning and afternoon Pc 5 pulsations are compared using the North American IMS magnetometer network data. Comparisons of phases and amplitudes between different stations were made by a cross spectral analysis. The magnetic local time (MLT) of the events analyzed extends from 0500 to 1100 for the morning and from 1200 to 2100 for the afternoon. All events were observed either during quiet periods or during the recovery phases of substorms. The following results are obtained: (1) The spatial phase structures are very similar in the morning and afternoon sectors for each of the three components. (2) The amplitudes are larger in X than in Y for both sectors, where X and Y are the magnetic north and east components, respectively. (3) The latitudinal variations of the amplitude and of the phase differences between X and Y show dissimilarities in the morning and afternoon sectors. These results suggest that the magnetic field oscillations in the compressional mode, which are believed to dominate in the afternoon magnetosphere, are not observed on the ground in this time sector. As seen from the ground observations, the pulsations in both time sectors are caused by oscillations of the magnetospheric field in the transverse mode. The theory of the resonant oscillation of the magnetic field lines, which successfully explains the pulsations in the morning sector, does not seem to be applicable to the pulsations in the afternoon sector.