Magnetic Storm Simulation With Multiple Ion Fluids: Algorithm
Abstract
We describe our progress in extending the capabilities of the BATS-R-US MHD code to model multiple ion fluids. We solve the full multiion equations with no assumptions about the relative motion of the ion fluids. We discuss the numerical difficulties and the algorithmic solutions: the use of a total ion fluid in combination with the individual ion fluids, the use of point-implicit source terms with analytic Jacobian, using a simple criterion to separate the single-ion and multiion regions in our magnetosphere applications, and an artificial friction term to limit the relative velocities of the ion fluids to reasonable values. This latter term is used to mimic the effect of two-stream instabilities in a crude manner. The new code is fully integrated into the Space Weather Modeling Framework and it has been coupled with the ionosphere, inner magnetosphere and polar wind models to simulate the May 4 1998 magnetic storm.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2008
- Bibcode:
- 2008AGUFMSM11A1568T
- Keywords:
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- 2431 Ionosphere/magnetosphere interactions (2736);
- 2730 Magnetosphere: inner;
- 2753 Numerical modeling;
- 2788 Magnetic storms and substorms (7954)