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7 - Modelling Internal and External Geomagnetic Fields Using Satellite Data

from Part II - Geomagnetic Field

Published online by Cambridge University Press:  25 October 2019

By
Ingo Wardinski  and
Erwan Thébault
Edited by
Mioara Mandea ,
Monika Korte ,
Andrew Yau  and
Eduard Petrovsky
Mioara Mandea
Affiliation:
Centre National d'études Spatiales, France
Monika Korte
Affiliation:
GeoforschungsZentrum, Helmholtz-Zentrum, Potsdam
Andrew Yau
Affiliation:
University of Calgary
Eduard Petrovsky
Affiliation:
Academy of Sciences of the Czech Republic, Prague
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Summary

Earth’s magnetic field as it is measured by satellite missions is mainly generated by the dynamo process in the liquid outer core of the Earth. Other sources that are also regarded as internal are the static lithospheric field due to crustal magnetisation, the induced field in the mantle, lithospheric and Oceanic induced fields. The latter are generated by secondary dynamo processes, where the motion of conductive seawater in an ambient magnetic field induces a magnetic field. External fields originate in Earth’s magnetosphere and ionosphere. All these individual source fields differ in their strength, they spatially overlap and vary on similar time scales. These characteristics are challenging in resolving the processes that are related to these sources. The aim of this article is to provide a brief review of current geomagnetic field modelling techniques, which are based on measurements of Earth’s magnetic field at satellite altitude. Furthermore, we discuss different applications of the field modelling techniques and their limitations.

Keywords

geomagnetic field modellingsatellite geomagnetisminverse theoryerror estimation
Type
Chapter
Information
Geomagnetism, Aeronomy and Space Weather
A Journey from the Earth's Core to the Sun
 , pp. 84 - 97
Publisher: Cambridge University Press
Print publication year: 2019

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