geomagnetic reversal

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geomagnetic reversal

Alternation of the Earth's magnetic polarity. The Earth's internal magnetic field reverses, on average, about every 300,000 to 1 million years. This reversal is very sudden on a geologic time scale, apparently taking about 5,000 years. The time between reversals is highly variable, sometimes less than 40,000 years and at other times as long as 35 million years. No regularities or periodicities have yet been discovered. A long interval of one polarity may be followed by a short interval of opposite polarity. See also polar wandering.

geomagnetic reversal [¦jē·ō·mag¦ned·ik ri′vər·səl]

(geophysics)

Reversed magnetization of the earth's magnetic dipole.

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No references found			One sign of this comes from patterns of geomagnetic reversals, when Earth's north and south magnetic poles swap positions. The mush zone: a slurpy layer lurks deep inside the planet by Monastersky, Richard / Science News thesis at the Centre des Faibles Radioactivites at Gif/Yvette by trying to extract information from the magnetization of tiny specimens of sediment, hoping that they would tell him something about geomagnetic reversals. From the superchron to the microchron: magnetic stratigraphy in deep ... by Gallet, Yves; Valet, Jean-Pierre / Oceanus Their MHD model had produced a geomagnetic reversal entirely on its own, without any provocation from the experimenters. Core concerns: the hidden reaches of Earth are starting to reveal ... by Monastersky, Richard / Science News			Geological Thermometry geological transportation Geologiia i Geofizika Geologiia Nefti i Gaza Geologiia Rudnykh Mestorozhdenii geologist geolograph Geology Geology and Fossil Fuel Treatment, Institute of IGIRGI Geology and Geophysics, Institute of IGiG Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Geology, Dynamic Geology, Military geomagnetic coordinates geomagnetic cutoff geomagnetic dipole geomagnetic electrokinetograph geomagnetic equator geomagnetic field geomagnetic field reversal Geomagnetic Latitude geomagnetic longitude geomagnetic meridian geomagnetic noise Geomagnetic Pole geomagnetic reversal geomagnetic secular variation geomagnetic storm geomagnetic variation geomagnetics geomagnetism Geomechanics geomembrane geometric Geometric Acoustics geometric albedo geometric attenuation geometric average geometric complex geometric construction geometric distribution geometric duals Geometric Factor geometric latitude geometric mean geometric moment of inertia geometric number theory geometric phase geometric problems of antiquity geometric programming geometric progression			geomagnetic coordinates geomagnetic cutoff geomagnetic dipole Geomagnetic dynamo Geomagnetic Electro-Kinetograph geomagnetic electrokinetograph geomagnetic equator geomagnetic equator Geomagnetic Event Observation Network by Students Geomagnetic field Geomagnetic field Geomagnetic field geomagnetic field reversal Geomagnetic flip Geomagnetic flip Geomagnetic Information Analysis Center Geomagnetic latitude Geomagnetic latitude Geomagnetic latitude Geomagnetic latitude geomagnetic longitude geomagnetic meridian geomagnetic noise Geomagnetic North Pole Geomagnetic Observing System geomagnetic polarity time scale Geomagnetic Pole Geomagnetic Pole Geomagnetic poles Geomagnetic poles geomagnetic reversal Geomagnetic reversals Geomagnetic reversals geomagnetic secular variation geomagnetic storm geomagnetic storm Geomagnetic storms Geomagnetic storms Geomagnetic Tail Laboratory geomagnetic variation geomagnetically geomagnetically Geomagnetically induced current Geomagnetics geomagnetism geomagnetism geomagnetism geomagnetism Geomalism Geoman Geoman Geoman geomancer geomancers geomancy Geomantiam Geomantiam geomantic GeoMar Geomatics Canada - Géomatique Canada Geomatics for Informed Decisions

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