Magnetic Field

Research output: Chapter in Book/Report/Conference proceedingEncyclopedia chapterResearchpeer-review

Abstract

he Earth has a large and complicated magnetic field, the major part of which is produced by a self-sustaining dynamo operating in the fluid outer core. Magnetic field observations provide one of the few tools for remote sensing the Earth’s deep interior, especially regarding the dynamics of the fluid flow at the top of the core. However, what is measured at or near the surface of the Earth is the superposition of the core field and fields caused by magnetized rocks in the Earth’s crust, by electric currents flowing in the ionosphere, magnetosphere, and oceans, and by currents induced in the Earth by time-varying external fields. These sources have their specific characteristics in terms of spatial and temporal variations, and their proper separation, based on magnetic measurements, is a major challenge. Such a separation is a prerequisite for remote sensing by means of magnetic field observations.
Original languageEnglish
Title of host publicationEncyclopedia of Remote Sensing
EditorsEni G. Njoku
PublisherSpringer
Publication date2015
Pages358-362
ISBN (Print)9780387366982
ISBN (Electronic)9780387366999
DOIs
Publication statusPublished - 2015
SeriesEncyclopedia of Earth Sciences Series
ISSN1388-4360

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