ENGLISH EDITION Preliminary Measurements of Geomagnetic-field Variations in

Abstract: The paper describes preliminary measurements of the Earth magnetic field made at the future geomagnetic observatory in Slovenia located at the bottom of the mountain peak Sinji Vrh above the town of Ajdovščina. Operation of the proton magnetometer has been verified for longer periods. This instrument is used to indicate the absolute value of the geomagnetic-field vector. These measurements provide the basis for continuous three-axis measurements of changes in the geomagnetic field as well as for evenly distributed, recurrent absolute measurements. Measuring results of the preliminary measurements of the absolute values of changes in the geomagnetic-field vector were treated as signals. The basic geophysical explanations were added to the results of data processing. Conclusions drawn from the preliminary measurements will be used for the future measuring equipment of the observatory necessary for its formal operational licensing and for its integration with the international information network. Key words: geomagnetic observatory, geomagnetic measurements, proton magnetometer