Geodetski list, Vol. 57 (80) No. 1, 2003.
Original scientific paper
Geomagnetic Declination of the territory of the Republic of Croatia based on Global Geomagnetic Models
Mario Brkić
; Institut za obrambene studije, istraživanja i razvoj, MORH, Zagreb, Hrvatska
Željko Hećimović
; Hrvatski geodetski institut, Zagreb, Hrvatska
Tomislav Bašić
; Faculty of Geodesy, University of Zagreb, Zagreb, Croatia
Abstract
International Geomagnetic Reference Field (IGRF) and World Magnetic Model (WMM) global geomagnetic models were presented. The magnetic declination and its secular variation was calculated by application of expansion of spherical harmonics. The irregular and slow variation of the Earth's magnetic field long-wave component was observed for the previous century's base epochs. Estimated IGRF and WMM declination accuracy is within 1 degree, which is satisfactory for global application. Higher accuracy of the geomagnetic declination necessary for local purposes can be attained only by continuos measurements and periodic surveys of the Earth's magnetic field elements.
Keywords
global geomagnetic models; IGRF; WMM; magnetic declination; secular variation
Hrčak ID:
290369
URI
Publication date:
31.3.2003.
Visits: 309 *