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geomagnetic field

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geomagnetic field

Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth's surface. Away from the surface, the field becomes distorted. Most geomagnetists explain the field by means of dynamo theories, whereby a source of energy in the Earth's core causes a self-sustaining magnetic field. In the dynamo theories, fluid motion in the Earth's core involves the movement of conducting material within an existing magnetic field, thus creating a current and a self-enforcing field.


geomagnetic field [¦jē·ō·mag¦ned·ik ′fēld]
(geophysics)
The earth's magnetic field.


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The report said that previous efforts to interpret the ancient geomagnetic field in rocks from North America were confused by the rapid migration of the continent toward the equator in the distant past.
Prediction of Storms Based on Planetary Positions and Geomagnetic Field Disturbances.
But the study's authors note that it's difficult to relate their findings directly to the use of geomagnetic fields in animals with a more complex cryptochrome system.
 
 
 
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