Location of the North Magnetic Pole in April 2007
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Observations have been made at five locations in the vicinity of the North Magnetic Pole (NMP). These were used in four different analyses—virtual geomagnetic pole, simple polynomial, spherical cap harmonic, best fitting grid—to derive positions of the NMP. The average position at 2007.3 was 83.95°N, 120.72°W, with a positional uncertainty of 40 km. This position is only 27 km from the pole position given by the CHAOS magnetic model. The NMP continues to move in a northwesterly direction but its drift speed has stabilized at just over 50 km per year. The number of direct observations is insufficient to determine if the NMP has started to decelerate.
Key wordsNorth Magnetic Pole secular variation geomagnetic models geomagnetic jerks
- Merrill, R. T., M. W. McElhinny, and P. L. McFadden, The magnetic field of the Earth, paleomagnetism, the core and the deep mantle, International Geophysics Series Volume 63, Academic Press, 531 pp., 1998.Google Scholar
- Newitt, L. R., C. E. Barton, and J. Bitterly, IAGA guide for magnetic repeat station surveys, International Association of Geomagnetism and Aeronomy special publications, 1996.Google Scholar