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geomagnetic field |
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geomagnetic fieldMagnetic 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. |
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Researchers have long proposed that the bacteria take advantage of Earth's geomagnetic field to hover in this preferred middle zone. Cl], geomagnetic field intensity, sunspot numbers), increasingly suggests that extraterrestrial phenomena mar be responsible for at least some climatic variability (Bond et al. 5 is considered to be due to the geomagnetic field, corresponding to a factor of two change in its intensity over the past 8000 years [15]. |
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