Geomagnetic Pole

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geomagnetic pole

[¦jē·ō·mag¦ned·ik ′pōl]
(geophysics)
Either of two antipodal points marking the intersection of the earth's surface with the extended axis of a powerful bar magnet assumed to be located at the center of the earth and having a field approximating the actual magnetic field of the earth.

Geomagnetic Pole

 

a point at which the earth’s magnetic axis intersects the surface of the earth. In a first approximation, the earth’s magnetic field is described as the field of a uniformly magnetized sphere (dipole), whose magnetic axis makes an angle of approximately 11.5° with the earth’s axis of rotation. In this approximation, the geomagnetic poles are the poles of a uniformly magnetized terrestrial sphere. All geomagnetic meridians converge at the geomagnetic poles. The location of the geomagnetic poles is determined according to data on the components of the earth’s main, or permanent, magnetic field. The coordinates of the geomagnetic poles for 1970, according to refined data, were as follows: 78° 31’ N lat., 70° 01’ W long, for the northern hemisphere and 78° 31’ S lat., 109° 59’ E long, for the southern hemisphere.

References in periodicals archive ?
The geomagnetic pole is the point used by scientists to identify the general location of the magnetic north.
Led by firefighter Jim McNeill, who was recently awarded the Captain Scott Sprit of Adventure Award, the seven-strong team is due to set out on the first stage later this month when it embarks on a journey to reach the Magnetic and Geomagnetic poles in one trip.
He found that the motion fits snugly with observations of how the magnetic field has been changing with time, in particular, how the geomagnetic poles have been moving.