Speaker
Description
Operational space weather forecasting requires magnetospheric models that balance physical accuracy with computational feasibility. Magnetohydrodynamic (MHD) simulations are affordable in terms of computational cost but miss critical kinetic effects, while hybrid/kinetic models provide accuracy at prohibitive costs.
We intend to pursue a novel approach based on the existing muphy2 framework. muphy2 is a multi-physics framework including Vlasov, ten-moment and five-moment two-fluid models. Simulations can be run either stand-alone or in coupled mode with threshold criteria determining model switching.
In this talk we present five- and ten-moment simulations of processes of relevance for terrestrial magnetospheres benchmarked against their Vlasov counterpart: Magnetic reconection, turbulence, and Kelvin-Helmholtz instability. We comment on the role of the heat flux closure in ten-moment models, as a way of introducing reduced kinetic effects in large-scale fluid simulations. Our ambition is to develop a coupled five-moment/ten-moment model for the global magnetosphere.
| Numerical model | muphy2 |
|---|
