Field line resonances in discretized magnetospheric models: an artifact study

Details Field line resonances in discretized magnetospheric models: an artifact study Field line resonances in discretized magnetospheric models: an artifact study

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997angeo..15..614s&link_type=abstract

Annales Geophysicae, vol. 15, Issue 6, pp.614-624

Physics

4

Scientific paper

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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