NPG Nonlinear Processes in Geophysics NPG Nonlin. Processes Geophys. 1607-7946 Copernicus Publications Göttingen, Germany 10.5194/npg-9-373-2002 Calculation of the parameter "deflection" in a new theory of the Earth’s magnetic field de Paor A. 1 Burke E. 1 Department of Electronic and Electrical Engineering, National University of Ireland, Dublin, Belfield, Dublin 4, Ireland 31 08 2002 9 3/4 373 375 Copyright: © 2002 A. de Paor 2002 This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Generic License. To view a copy of this licence, visit https://creativecommons.org/licenses/by-nc-sa/2.5/ This article is available from https://npg.copernicus.org/articles/9/373/2002/npg-9-373-2002.html The full text article is available as a PDF file from https://npg.copernicus.org/articles/9/373/2002/npg-9-373-2002.pdf

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 <i>def </i>). In this note, the significance of def is elucidated and the method used to calculate it is explained.