Accuracy of geomagnetic field distribution maps – a method demonstrated on magnetic ground survey of Slovakia for the 2007.5 epoch

Paper type: 
Poster

 

Accuracy of geomagnetic field distribution maps – a method demonstrated on magnetic ground survey of Slovakia for the 2007.5 epoch

 

Peter Dolinský, Fridrich Valach, and Magdaléna Váczyová

 

Geomagnetic Observatory, Geophysical Institute, Slovak Academy of Sciences, Hurbanovo, Slovakia

 

Determination of the GeoMagnetic Field (GMF) elements’ spatial distribution is of great importance for scientific purposes as well as in practice. In addition, the information about accuracy of the geomagnetic maps needs to be known for practical use and also if the maps are used as input information of following research studies. The up to now papers have usually contained comments about the precision of the instruments, which were employed for the measurements of the GMF. This information likely does not answer the question about the quality of the geomagnetic maps because our experience shows that spatial variations of the field within several surrounding kilometres often exceed instruments’ precisions. In the paper, we proposed a simple method for accuracy evaluation o GMF elements’ distribution maps. It was applied to the maps which are the result of the magnetic ground survey carried out in Slovakia in the 2007.5 epoch. The method is applicable to the results both of the ground surveys as well as repeat station surveys. It consists in a simple procedure which is repeated for each observation point of the net. One simple point drops out of the data base for map creation, then the map is created in a standard way, and finally the value of the dropped out observation point is compared with the value determined from the map.

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