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Massive multi-mission statistical study and analytical modeling of the Earth’s magnetopause: 4- On the near-cusp magnetopause indentation
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  • Gautier Nguyen,
  • Nicolas Aunai,
  • Bayane Michotte de Welle,
  • Alexis Jeandet,
  • Benoit Lavraud,
  • Dominique Fontaine
Gautier Nguyen
Direction Générale de l'Armement

Corresponding Author:gautier-mahe.nguyen@intradef.gouv.fr

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Nicolas Aunai
IRAP, Toulouse, France
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Bayane Michotte de Welle
Ecole polytechnique
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Alexis Jeandet
Ecole polytechnique
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Benoit Lavraud
Institut de Recherche en Astrophysique et Planetologie - CNRS
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Dominique Fontaine
Laboratoire de Physique des Plasmas (LPP/CNRS), Paris, France
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The shape and location of the magnetopause current sheet in the near-cusp region is still a debated question. Over time, several observations led to contradictory conclusions regarding the presence of an indentation of the magnetopause in that region. As a result several empirical models consider the surface is indented in that region, while some others do not. To tackle this issue, we fit a total of 17 230 magnetopause crossings to various indented and non-indented analytical models. The results show that while all models describe the magnetopause position and shape equivalently far from the cusp region, the non-indented version over-estimate the radial position of the near-cusp magnetopause. Among indented models, we show that the one designed from MHD simulations fits well the near-cusp magnetopause location, while the other underestimate its position probably because their design was possibly based on magnetopause crossing catalogues that contain cusp inner boundary crossings.
Jan 2022Published in Journal of Geophysical Research: Space Physics volume 127 issue 1. 10.1029/2021JA029776