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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 6
Ann. Geophys., 15, 614–624, 1997
https://doi.org/10.1007/s00585-997-0614-0
© European Geosciences Union 1997
Ann. Geophys., 15, 614–624, 1997
https://doi.org/10.1007/s00585-997-0614-0
© European Geosciences Union 1997

  30 Jun 1997

30 Jun 1997

Field line resonances in discretized magnetospheric models: an artifact study

M. Stellmacher2,1, K.-H. Glassmeier2, R. L. Lysak3, and M. G. Kivelson1 M. Stellmacher et al.
  • 1Institute of Geophysics and Planetary Physics, University of California at Los Angeles, California, USA
  • 2Institut für Geophysik und Meteorologie, Technische Universität Braunschweig, Germany
  • 3School of Physics and Astronomy, University of Minnesota, Minneapolis, USA

Abstract. For more than two decades numerical models of the Earth's magnetosphere have been used successfully to study magnetospheric dynamic features such as the excitation of ULF pulsations and the mechanism of field line resonance. However, numerical formulations simplify important properties of the real system. For instance the Alfvén continuum becomes discrete because of a finite grid size. This discretization can be a possible source of numerical artefacts. Therefore a careful interpretation of any observed features is required. Examples of such artefacts are presented using results from a three dimensional dipole model of the magnetosphere, including an inhomogeneous distribution of the Alfvén velocity.

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