A new simulation tool for coupling global magnetohydrodynamic models to ionosphere- thermosphere models

Details A new simulation tool for coupling global magnetohydrodynamic models to ionosphere- thermosphere models A new simulation tool for coupling global magnetohydrodynamic models to ionosphere- thermosphere models

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm41a0320m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM41A-0320

Physics

2722 Forecasting (7924, 7964), 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling, 7959 Models

Scientific paper

We report on a newly developed simulation tool that provides a framework for coupling global magnetohydrodynamic (MHD) models to models of the ionosphere-thermosphere. This simulation code combines two main capabilities. Firstly, it serves as an interface between the physical models by implementing the necessary grid interpolation manipulations using generic grid-independent algorithms. Secondly, it solves for the ionospheric electrostatic potential using the well-established approach based on current continuity. The algorithm for the numerical solution of the elliptic equation is very flexible and allows virtually arbitrary choice of a solution grid and boundary conditions. We demonstrate the capabilities of this simulation code by coupling the parallelized version of the Lyon-Fedder-Mobarry (LFM) global MHD model to two different ionosphere-thermosphere models developed at NCAR, TING and TIEGCM. To this end, we choose an event that has previously been studied using the conventional LFM model and compared to Iridium and DMSP observations of the ionospheric field-aligned currents and convection pattern. We compare the results obtained by coupling to the two ionosphere-thermosphere models as well as by using the empirical model of the ionospheric conductance implemented in the conventional LFM model.

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