Gap Region FACs Included in Calculating Ground Magnetic Perturbations in a Global MHD Model and Study of the Asymmetric of the Ring Current

Details Gap Region FACs Included in Calculating Ground Magnetic Perturbations in a Global MHD Model and Study of the Asymmetric of the Ring Current Gap Region FACs Included in Calculating Ground Magnetic Perturbations in a Global MHD Model and Study of the Asymmetric of the Ring Current

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1660y&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1660

Physics

2409 Current Systems (2721), 2778 Ring Current

Scientific paper

In many previous studies that have compared ground-based magnetic perturbations to output from global MHD simulations of the magnetosphere, only the ionospheric Hall currents have been considered. This is problematic at low- and mid-latitudes, where a large percentage of the perturbation is due to currents in the magnetosphere. Inclusion of the currents within the magnetospheric domain is relatively easy, since the perturbations can simply be calculated in parallel and summed to give a total perturbation throughout the domain. But, there is a 'gap' region between the inner boundary of global magnetosphere models and ionospheric electrodynamics models, where it is difficult to solve the MHD equations numerically due to the high Alfven speed as well as the complex physical processes. Efforts have been made in solving the field- aligned currents (FACs) in this 'gap' region in three dimensions by tracing the dipole magnetic field lines starting from the ionosphere. This is done in the global magnetosphere model (BATSRUS) from University of Michigan. In addition to the currents from the global magnetosphere model and horizontal currents (Hall current, Pederson current) in the ionosphere, the newly solved FACs are also taken into account in calculating the ground magnetic perturbations through Biot-Savart integrals. Comparisons between the model results and the data for some real magnetometer stations will be presented. With high resolution, low- latitude perturbations (from both the simulation and the ground-based magnetometers), presented in MLT- UT plots will be shown to study the asymmetry of the ring current during quiet and storm times.

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