| Event Description: Andrew Jackson, Department of Earth Sciences, ETH Zürich Numerical models of the Earth's magnetic field: From conventional to magnetostrophic The last 25 years has seen great progress in 3D self-consistent numerical models of the geodynamo. In particular, thermal driving is able to create fluid motion that sustains magnetic fields against Ohmic losses. Spectral methods have allowed us to develop sophisticated models that capture the basic physics, and we have gone on to develop basic scaling laws, which I will review. These successes are despite the fact that we know that the computationally feasible regime differs from the regime of the true Earth, sometimes by many orders of magnitude in control parameters. I'll review the motivation for a complementary approach, namely the magnetostrophic equations. Certain mathematical obstacles arise when one adopts this asymptotic approximation, but I will show the recent progress that we have made in creating a computational scheme for these difficult equations.
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| Location Information: Main Campus - Engineering Office Tower (View Map) 1111 Engineering DR Boulder, CO Room: 226: Applied Math Conference Room |
| Contact Information: Name: Ian Cunningham Phone: 303-492-4668 Email: amassist@colorado.edu |