engleski

Croatian Geomagnetic Network, Survey and GI2009.5 Model - A National Report

Surveys of the Basic Geomagnetic Network in 2008, 2009 and 2010 resulted in geomagnetic information (i.e. declination and its annual variation) models, available for civilian and military (as well as the 'small') users. The GI2009.5 model, which met its purpose in updating of Croatian topographic maps, was outlined, and the declination and annual variation map of 2009.5 was given. Repeat station data for the 2009.5 epoch were also presented. The analysis of all repeat station measurements in the period 2004-2012 on the POKU station was presented and shown that the most reliable geomagnetic element values were determined from night-time observations. The corrections for the transition of the azimuth values determined in heterogeneous realization of the Croatian State Coordinate System (CSCS) to the homogeneous and global ETRF2000 were given.

geomagnetic surveys; geomagnetic information model; declination map; reference mark azimuth

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