Earth Planets Space, Vol. 61 (No. 6), pp. 703-710, 2009
L. R. Newitt1, A. Chulliat2, and J.-J. Orgeval3
1310-1171 Ambleside Drive, Ottawa, Canada K2B 8E1
2Equipe de Géomagnétisme, Institut de Physique du Globe de Paris, 4 Place Jussieu, 75005 Paris, France
316, Allé du Houx 45160 Olivet, France
(Received January 8, 2008; Revised November 20, 2008; Accepted November 22, 2008; Online published July 27, 2009)
Observations have been made at five locations in the vicinity of the North Magnetic Pole (NMP)νll. These were used in four different analysesvirtual geomagnetic pole, simple polynomial, spherical cap harmonic, best fitting gridto 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 words: North Magnetic Pole, secular variation, geomagnetic models, geomagnetic jerks.