Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm32b..04w&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM32B-04
Physics
[2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2753] Magnetospheric Physics / Numerical Modeling
Scientific paper
Global scale models of the solar wind-magnetosphere-ionosphere interaction have long established history of including magnetosphere-ionosphere coupling through the electrodynamic coupling. Typically this coupling includes closure of field aligned currents from the magnetosphere in the electrostatic ionosphere with the conductances being modified by particle precipitation processes. Recent advances in simulation technology, namely multi-fluid MHD, allow the scope of MI coupling in simulations to include mass outflows from the thermosphere-ionosphere into the magnetosphere. Multiple approaches to addressing this challenge have been developed. In one approach empirical parametrization of the outflow characteristics, namely velocity and flux, are used to include high intensity sources such as the auroral zone and cusp. Another approach starts by modeling the plasma flow along a single field line and then expands to include multiple field lines convecting over the polar cap. In both approaches the ionospheric outflow has profound effects on the state of the magnetosphere. Generally speaking it improves agreement with Dst observations, alters the cross polar cap potential, and can fundamentally alter the evolution of the modeled magnetospheric state. Initial indications from some of the model efforts show that including this plasma source may also alter the solar wind-magnetosphere interaction. While significant advances on including these effects in global scale models has been accomplished many challenges remain.
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