In 1981 a German permanent wintering-over base - the Georg von Neumayer station (GVN) - was established. Since then, geophysical and meteorological parameters have been recorded continuously. Although it seems that an antarctic ice shelf is not suited as base for a permanent geophysical observatory, it could be shown, that the continous registration of the geomagnetic field vector at GVN is very useful for studies of ionospheric and magnetospheric phenomena. In order to separate true time variations of the geomagnetic data from local disturbances at first many careful statistical studies of the measured time series were necessary. For instance contaminating swell-effects could be detected, and it is important to distinguish these from geomagnetic pulsations. With the methods of statistical frequency analyses, high frequency data sampled with 10 Hz were processed to obtain the daily variation of the occurences and mean periods of pc3-pulsations. A changing period of the recorded pc3-pulsations could be found. These daily shifts of the period are related to earthmagnetic shells with different L-numbers, moving over the Ekström Ice Shelf dependent on time of day and geomagnetic activity. Furthermore the influence of the polar electro jet on geomagnetic depth sounding results could be derived from many soundings based on time series sampled at GVN with 10 Hz. Inhomogeneous parts in the magnetic time series with periods around 100 seconds are prominent indicators for the determination of the contact times of the auroral oval relative to GVN. With that, it could be shown that inhomogeneous parts generated mainly by the ionospheric field-aligned currents, are small for time series measured between 8 and 18 o'clock (UTC), that is where the geomagnetic activity moves between 2≤Kp≤3. © 1988 Deutsches Hydrographisches Institut.