Geomagnetic data from four Antarctic stations, located at -80 corrected geomagnetic (CGM) latitude, have been analyzed. The magnetic local time (MLT) occurrence distributions and seasonal dependence of geomagnetic power levels in the Pc5 frequency band are studied. It is found that the pulsation power can be significantly influenced by the MLT location of the station at the specific UT time considered, regardless of interplanetary conditions or geomagnetic activity. A shift of power amplitudes toward higher values is found during local summer, likely in association with the increased ionospheric conductance. The local dayside summer increase of power relative to the winter condition is higher than on the nightside. This finding is explained by the magnetospheric cusp influence on the production of geomagnetic power. ¿ 1998 American Geophysical Union