Oilfield Glossary
Oilfield Glossary
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magnetic field

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1. n. [Geophysics]
The magnetic field measured near the Earth’s surface is the superposition of magnetic fields arising from various time-varying physical processes that are grouped into four general components: the main magnetic field, the crustal field, the external disturbance field and local magnetic interference. The significance of these contributions to direction, strength and stability of the magnetic field varies with geographic region and with magnetic survey direction.