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 ?
May and Chenoweth operated the expedition's base camp from Resolute, on Ellesmore Island, in Canada's Northwest Territory, as the five British explorers engaged in their 20-day, 274-mile walk to the North Geomagnetic Pole.
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.
The geomagnetic pole is the point used by scientists to identify the general location of the magnetic north.
A British explorer launched one of the last Arctic challenges - the first solo and unsupported expedition to the North Geomagnetic Pole - from Swindon Ice Rink yesterday.
The geomagnetic pole is a mathematically pinpointed position which differs from the shifting magnetic North Pole.
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.
His expedition will later in the year take him on a solo trek to the Geographic North Pole, and then supported by a team to the Magnetic and Geomagnetic poles.
2 [degrees]), compared with geomagnetic poles for the past 5000 years for southeastern Europe (Kovacheva 1980), places the sample in the 18th century BC, which corresponds to the Middle Bronze Age in the conventional chronology.
He has already reached both the North and South geomagnetic poles, the geographical South Pole and climbed the highest mountains on seven continents.