Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21c0273n&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM21C-0273
Physics
2411 Electric Fields (2712), 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling, 7959 Models
Scientific paper
Recent global MHD simulations have adopted the following boundary condition of the inner magnetosphere. First, Field-Aligned Currents (FACs) are determined by magnetic perturbations at the inner boundary of the magnetosphere. Mapping the FACs into the ionosphere along the main magnetic field, the ionospheric electric potentials are calculated from the equation of current continuity; j=Σ∇φ , where j is FAC, Σ is ionospheric conductivity tensor, and φ is the ionospheric electric potential. The resultant electric potentials are mapped out to the inner boundary of the magnetosphere. However, results of global MHD simulations are not always satisfied to this boundary condition at both the ionosphere and the inner boundary. Using a new process of magnetosphere-ionosphere coupling, therefore, we have done a global MHD simulation of the Earth's Magnetosphere. In the new process of the magnetosphere-ionosphere coupling, the component which vary with times from potentials and FACs. In the new process of the magnetosphere-ionosphere coupling, we separate the correct values of potentials and FACs in the inner boundary into the components generated due to M-I coupling and those determined by the MHD equations. In addition, these MHD-determined components include perturbed components propagating from the magnetosphere. Regarding the boundary condition as the problem of wave reflection, we can consider that the components generated by M-I coupling and those propagating from the magnetosphere are balanced. Therefore, field-aligned currents and the electric potentials are self-consistently determined assuming that the field-aligned currents are associated with the shear Alfvén waves. Since the perturbed components of the electric potentials are regarded as inductive, the new process is applicable to the general problems of the magnetosphere-ionosphere coupling. In the presentation, we present the results of the calculation including the new algorithm.
Nakata Hisaho
Tanaka Toshiaki
Yoshikawa Akira
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