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| Titel |
Magnetic nulls in three-dimensional particle-in-cell simulations of turbulent plasmas. |
| VerfasserIn |
Vyacheslav Olshevsky, Fabio Bacchini, Stefaan Poedts, Giovanni Lapenta |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250147786
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| Publikation (Nr.) |
 EGU/EGU2017-11995.pdf |
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| Zusammenfassung |
| Slurm, a new Lagrangian magnetohydrodynamic Particle-in-Cell solver developed at KU
Leuven, is used to study magnetic nulls in turbulent magnetized plasmas. We model a
classic hydrodynamic Taylor-Green vortex with superimposed magnetic field. Three
different configurations of the magnetic field are used and compared with each
other, and with the kinetic particle-in-cell simulations of the same configurations.
The kinetic simulations are performed by the fully kinetic electromagnetic code
iPic3D.
We apply the topological degree method to identify magnetic nulls in our simulations. In
all three cases, the number of nulls is evolving with time and shows a distinct peak at the
moment of maximum energy dissipation. In two cases, the fraction of magnetic
nulls of the spiral topological type is high, about 80% of the total number of nulls.
On contrary, in the third magnetic field configuration the fraction of spiral nulls is
low and is decreasing with time. Processes associated with magnetic reconnection
at null points may influence turbulent energy dissipation in magnetized plasmas. |
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