MHD silmulation of the saturation polar cap potentials and the role of field-aligned currents

Details MHD silmulation of the saturation polar cap potentials and the role of field-aligned currents MHD silmulation of the saturation polar cap potentials and the role of field-aligned currents

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm41d..05l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM41D-05

Physics

2409 Current Systems (2721), 2431 Ionosphere/Magnetosphere Interactions (2736), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

During southward IMF, for small values of VBz in the solar wind the potential is linearly dependent on VBz, but for large values of VBz the potential behaves nonlinearly and reaches a saturation value. The Lyon-Fedder- Mobarry MHD simulation reproduces this effect. We will present a physical model for saturation based on the force on the solar wind exerted by field-aligned currents, whose distribution changes to include more current on open field lines during saturated periods. We will also present observations to support our basic conclusion that the flow of field-aligned current into the magnetosheath along open field lines is the agent that produces the saturation effect.

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