Abstract
Since the beginning of geomagnetic recording at Tihany Geophysical Observatory, baseline instability has been observed, especially in the case of the old variation house. The regularly observed annual baseline change is independent from the type of magnetometer. Common environmental effects on the instruments (for example temperature effects) are not suitable to characterize this variation. A possible reason of this instability is an unconventional geomagnetic effect on the magnetic properties of the sediment. The water saturation of a lake mud in a geyser cone shows correspondence with the variation of the base values. X-ray powder diffraction measurement detected goethite in the lake mud which, in fact makes possible the appearance of a super-ferromagnetic effect on goethite. In this study we present a possible source and the mechanism of the effect.
Highlights
The systematic geomagnetic recording have been restarted in 1949 at a temporary station in Hungary, the need for a permanent observatory was strongly felt during the 1949-50 geomagnetic base network measurements
We found that the deposit is slightly magnetic so the appearance of detrital remanent magnetization (DRM) as perhaps chemical remanent magnetization (CRM) of the sediment is evident
The presented instability on the base values appears especially in measurements made in the old variation house of the Tihany observatory
Summary
The systematic geomagnetic recording have been restarted in 1949 at a temporary station in Hungary, the need for a permanent observatory was strongly felt during the 1949-50 geomagnetic base network measurements. The difference between the result of the absolute measurement and the synchronous record of the variometer is the base value of ductivity contrast caused by external magnetic fields were repeatedly studied before. The gradients of the geomagnetic elements are not constant regions affected by induction effects and their fluctuations depends on the frequency of the geomagnetic variations It fallows that, in presence of conductivity contrasts in the area of the observatory the accuracy of the absolute control of a variometer is decreased, because the base values of a variometer become dependent on the influences of external magnetic fields [Csontos, 2012]. We will present the steps to isolate the possible sources
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