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Importance of Using a Reference Base Station in Geomagnetic Surveys - Case Studies from Bulgaria
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 11th Congress of the Balkan Geophysical Society, Oct 2021, Volume 2021, p.1 - 5
Abstract
During ground magnetic surveys are recorded signals from a wide variety of sources – from terrain, natural and man-made surface features, as well as instrumental, geological, and planetary sources. Such signals directly disturb the subsurface effects over the Earth’s surface causing errors in the measurements. External variations which are due to the Solar-Earth interaction are one of the “noise” signals which are always removed as a preprocessing procedure. This could be done by using a locally installed base station or using the data from the nearest geomagnetic observatory.
We analyze records from six ground surveys accomplished on the territory of Bulgaria using a reference base station to see what would be the errors if such station was not available and Panagjurishte observatory data were used instead. Our results show that the differences in the recorded daily variations are limited to ± 5 nT and the frequency interval is large enough to prevent the misinterpretation of signals from the real sources.