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 data on the motion of the geomagnetic poles had been derived from ship log data since 1590 and recorded by the National Geophysical Data Center (NGDC) of the National Oceanic and Atmospheric Administration (NOAA).
First, the observed motion of the geomagnetic poles showed that the North Pole has abruptly shifted since 1970.
Once they reach the Magnetic North Pole they will turn right to Ellesmere Island where they will cross a 4,000ft-high glaciated mountain range towards Greenland before reaching the earth's Geomagnetic Pole a further 300 miles away.
The geomagnetic pole is the point used by scientists to identify the general location of the magnetic north.
He has already reached both the North and South geomagnetic poles, the geographical South Pole and climbed the highest mountains on seven continents.
Auroras occur within an oval about 500 to 1,500 kilometers wide that's centered on the geomagnetic poles.
And from even higher up, satellites provide a global view of the auroral oval, the ring of light circling each geomagnetic pole.