Open Access

Location of the North Magnetic Pole in April 2007

Earth, Planets and Space200961:BF03353178

https://doi.org/10.1186/BF03353178

Received: 8 January 2008

Accepted: 22 November 2008

Published: 27 July 2009

Abstract

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 words

North Magnetic Pole secular variation geomagnetic models geomagnetic jerks