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magnetic pole

magnetic pole, the two nearly opposite ends of the planet where the earth's magnetic intensity is the greatest, as the north and south magnetic poles. For the magnetic north, it is the direction from any point on the earth's surface linking the horizontal component of the magnetic lines of force with the observer and north magnetic pole; it is similar for magnetic south. The north magnetic pole, first located (1831) by British explorer Sir James C. Ross, is now about 78°N and 104°W in the Queen Elizabeth Islands of northern Canada. The south magnetic pole, reached (1909) by Australian geologists Sir T. W. E. David and Sir Douglas Mawson, is now about 66°S and 139°E on the Adélie Coast of Antarctica. The magnetic poles are not fixed but follow circular paths with diameters of about 100 miles (160 km). Studies of paleomagnetism also indicate that the earth's magnetic field has reversed its polarity many times in the geologic past. The best hypothesis to date for the origin of terrestrial magnetism is the self-exciting dynamo theory, where the earth's magnetic field is generated by the interaction of motion and electrical currents in the earth's liquid outer core.

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"magnetic pole." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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magnetic pole

mag·net·ic pole • n. each of the points near the extremities of the axis of rotation of the earth or another celestial body where a magnetic needle dips vertically. ∎  each of the two points or regions of an artificial or natural magnet to and from which the lines of magnetic force are directed.

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"magnetic pole." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

"magnetic pole." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 23, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/magnetic-pole

"magnetic pole." The Oxford Pocket Dictionary of Current English. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/magnetic-pole

magnetic north

mag·net·ic north • n. the direction in which the north end of a compass needle or other freely suspended magnet will point in response to the earth's magnetic field. It deviates from true north over time and from place to place because the earth's magnetic poles are not fixed in relation to its axis.

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pole, magnetic

magnetic pole: see magnetic pole.

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