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2 results

  • 7 - Modelling Internal and External Geomagnetic Fields Using Satellite Data

  • from Part II - Geomagnetic Field
  • Edited by Mioara Mandea, Monika Korte, Andrew Yau, University of Calgary, Eduard Petrovsky, Academy of Sciences of the Czech Republic, Prague
  • Book:
    Geomagnetism, Aeronomy and Space Weather
    Published online:
    25 October 2019
    Print publication:
    14 November 2019, pp 84-97

  • 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.