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Geomagnetic field residuals from CHAMP satellite: essential for revealing unmodelled sources

  • ArabGU2016
  • Published:
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Abstract

Recently, due to more than a decade of magnetic measurements obtained from LEO (low Earth orbit) satellites, more robust global geomagnetic field models have been produced. Generally, these models are based on data selected on specific criteria, as night-side and quiet-time measurements to get the best possible description of the internal contributions and to minimise the ionospheric and magnetospheric effects. Despite recent efforts, the external fields contributions remain poorly modelled and clearly understood. Here, we propose to estimate the unmodelled signals mainly linked to the external magnetic fields. We compute residuals from the available day-time and night-time original CHAMP (CHAllenging Minisatellite Payload) satellite data and GRIMM-3 model. The post-processing of residuals and the residuals distribution for all geomagnetic field components offer us the possibility to investigate some of their specific features, important to be considered when internal field models are computed.

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Notes

  1. www.space.dtu.dk/english/Research/Projects/Oersted

  2. www.gfz-potsdam.de/champ

  3. www.conae.gov.ar/index.php/english/satellite-missions/sac-c/objectives

  4. www.esa.int/swarm

  5. http://isdc.gfz-potsdam.de

  6. www.gfz-potsdam.de

  7. http://gmt.soest.hawaii.edu/

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Acknowledgements

The support of the CHAMP mission by the German Aerospace Center (DLR) and the Federal Ministry of Education and Research is gratefully acknowledged. Warm thanks to the two anonymous reviewers for their comments which helped greatly in improving the manuscript. We also acknowledge the Associate editors and the Editor handling this special issue.

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Authors and Affiliations

  1. Laboratoire de Géophysique, FSTGAT, Université des Sciences et de la Technologie Houari Boumediene, BP32 USTHB, 16123 Bab-Ezzouar, Algiers, Algeria

    Sabrina Tair, Yasmina Yahiat & Mohamed Hamoudi

  2. Institut de Physique du Globe de Paris, 1 rue Jussieu, 75238, Paris cedex 05, France

    Vincent Lesur

  3. CNES - Centre National d’Etudes Spatiales, 2 Place Maurice Quentin, 75039, Paris cedex 01, France

    Mioara Mandea

  4. Facultatea de Geografie – Universitatea Babeș – Bolyai, Strada Clinicilor, Nr 5-7, 400006, Cluj-Napoca, Romania

    Ioan Rus

Authors
  1. Sabrina Tair
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  2. Yasmina Yahiat
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  3. Mohamed Hamoudi
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  4. Vincent Lesur
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  5. Mioara Mandea
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  6. Ioan Rus
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Corresponding author

Correspondence to Mohamed Hamoudi.

Additional information

Vincent Lesur was formerly affiliated at GeoForschungsZentrum, GFZ, section 2.3, Behlestrasse, 14170 Potsdam, Germany

This article is part of the Topical Collection on Current Advances in Geology of North Africa

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Tair, S., Yahiat, Y., Hamoudi, M. et al. Geomagnetic field residuals from CHAMP satellite: essential for revealing unmodelled sources . Arab J Geosci 11, 1 (2018). https://doi.org/10.1007/s12517-017-3236-1

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