About the Inflow Boundary Condition for Forecasting Simulations of Magnetospheric Dynamics.

Details About the Inflow Boundary Condition for Forecasting Simulations of Magnetospheric Dynamics. About the Inflow Boundary Condition for Forecasting Simulations of Magnetospheric Dynamics.

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm22b08k&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM22B-08

Statistics

Applications

2722 Forecasting, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

A time varying interplanetary magnetic field component normal to the simulation box inflow boundary poses a long standing problem in global simulations of magnetospheric dynamics. A simple and common approximation is to ignore the Bx component of the measured interplanetary magnetic field. Improved models are employing approximations for Bx that require the knowledge of the interplanetary magnetic field for the entire simulation interval. Obviously, methods that require knowledge of the interplanetary conditions at future times are not applicable for forecasting simulations. For these applications, only the historic and present interplanetary data can be used as simulation input. In order to evaluate suitable approximations, the following questions need to be addressed: 1. How important is the impact of Bx variations on the magnetosphere and ionosphere? 2. How accurate is the constant Bx approximation? In order to address these questions we utilize the BATSRUS global MHD model developed at the University of Michigan. We investigate the effect of variations of the Bx component on magnetospheric dynamics. For time-varying Bx, we compare different methods of preserving a divergence-free magnetic field by imposing y and z variations of the By and Bz components at the front boundary. The results of these simulations are compared to a standard calculation, which assumes Bx=0.

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