Exact Vlasov-Maxwell equilibria for asymmetric current sheets
| Autor: | Allanson, O., Wilson, F., Neukirch, T., Liu, Y. -H., Hodgson, J. D. B. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Geophys. Res. Lett., 44,doi:10.1002/2017GL074168 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1002/2017GL074168 |
| Popis: | The NASA Magnetospheric Multiscale mission has made in situ diffusion region and kinetic-scale resolution measurements of asymmetric magnetic reconnection for the first time, in the Earth's magnetopause. The principal theoretical tool currently used to model collisionless asymmetric reconnection is particle-in-cell simulations. Many particle-in-cell simulations of asymmetric collisionless reconnection start from an asymmetric Harris-type magnetic field but with distribution functions that are not exact equilibrium solutions of the Vlasov equation. We present new and exact equilibrium solutions of the Vlasov-Maxwell system that are self-consistent with one-dimensional asymmetric current sheets, with an asymmetric Harris-type magnetic field profile, plus a constant nonzero guide field. The distribution functions can be represented as a combination of four shifted Maxwellian distribution functions. This equilibrium describes a magnetic field configuration with more freedom than the previously known exact solution and has different bulk flow properties. Comment: Final Author version. The Open Access Geophysical Review Letters article is at http://onlinelibrary.wiley.com/doi/10.1002/2017GL074168/full |
| Databáze: | arXiv |
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