Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11d..07r&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM11D-07
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2712 Electric Fields (2411), 2721 Field-Aligned Currents And Current Systems (2409), 2730 Magnetosphere: Inner, 2753 Numerical Modeling
Scientific paper
In this study we investigate the dependence of the cross-polarcap electric potential difference as a function of ionospheric conductance by using global magnetosphere models resident at the Community-Coordinated Modeling Center. The models are run with constant solar wind conditions or conditions that include step changes in the primary geomagnetic driving component B_z. The investigation considers the amplitude of the ionospheric electric potentials as a function of not only the level of (constant) ionospheric conductance but also as a function of intrinsic model parameters, such as the grid resolution in the near-Earth magnetosphere. For a simple solar EUV-induced conductance pattern the amount of asymmetry in the electric potentials and the field-aligned currents are studied as a function of model resolution. Finally, the magnetosphere-ionosphere response to changes in the solar wind B_z is studied as a function of the conductance to determine whether the conductance has a measurable effect on the timing of dynamic processes in the magnetosphere as represented by the models. This study is an important part in scientific validation of model capabilities.
Hesse Matthias
Kuznetsova Masha
Rastaetter Lutz
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