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Mars’ Crustal Magnetic Field

  • Achim Morschhauser
  • Foteini Vervelidou
  • Paul Thomas
  • Matthias Grott
  • Vincent Lesur
  • Stuart A. Gilder
Part of the Astrophysics and Space Science Library book series (ASSL, volume 448)

Abstract

Fossil magnetic fields within the Martian crust record the history of the planet’s ancient dynamo and hence retain valuable information on the thermal and chemical evolution of Mars. In order to decode this information, we have derived a spherical harmonic model of the crustal magnetic field. This model was derived from satellite vector magnetometer data, and allows to study the crustal magnetic field at high resolution down to surface altitudes. Based on this model, we calculate the required magnetization of the Martian crust, and discuss how the resulting strong magnetization might be explained. Further, we study the magnetization of impact craters and volcanoes, and conclude that the Martian core dynamo shut down most probably in the Noachian, at about 4.1 Gyr ago. Finally, we address the derivation of magnetic paleopole positions. In a first step, we use synthetic tests in order to outline under which constraints paleopole positions can be determined from satellite measurements. In a second step, we use these insights to present a scheme to estimate paleopole positions including an assessment of their underlying uncertainties.

Notes

Acknowledgements

This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within the priority program “Planetary Magnetism” (SPP 1488) under grants LE2477/3-1, LE2477/3-2 (F.V. and V.L.), GR3751/1-1 (A.M. and M.G.), GR3751/1-2 (A.M., M.G., and P.T.), and GI712/6-1 (S.G.).

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  • Achim Morschhauser
    • 1
  • Foteini Vervelidou
    • 1
  • Paul Thomas
    • 2
  • Matthias Grott
    • 2
  • Vincent Lesur
    • 3
  • Stuart A. Gilder
    • 4
  1. 1.GFZ German Research Centre for GeosciencesPotsdamGermany
  2. 2.Institute of Planetary ResearchGerman Aerospace CenterBerlinGermany
  3. 3.Institut de Physique du Globe de ParisSorbonne Paris Cité, Université Paris-DiderotParisFrance
  4. 4.Department of Earth and Environmental SciencesLudwig Maximilians UniversitätMünchenGermany

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