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In a recent paper on the theory of the Earth’s magnetic field and key features of Sunspot activity (de Paor, 2001), a central role in the calculation of secular variations of the geomagnetic field was played by a newly-introduced parameter called the deflection (abbreviated def ). In this note, the significance of def is elucidated and the method used to calculate it is explained
De Paor, A., Burke, T.: Calculation for the parameter "deflection" in a new theory of the earth's magnetic field. Nonlinear Processes in Geophysics, Vol.9, pp.373-375. 2002.