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| Titel |
Dipolarization front structure as viewed from three-dimensional PIC simulations |
| VerfasserIn |
Andrey Divin, Yuri Khotyaintsev, Stefano Markidis, Andris Vaivads, Giovanni Lapenta, Alexander Vapirev |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250079513
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| Zusammenfassung |
| Dipolarization fronts (DFs) are brief and sharp jumps of the magnetic field component
normal to the tail, accompanied by the fast plasma flows. Two-dimensional Particle-in-Cell
simulations reproduce many important features (Bz component jump, density peak/wake
at/behind the front). However, such critical signatures like enhanced wave activity at the
front, or strong normal (Ex) electric field are excluded in the two dimensions. We performed
3D Particle-in-Cell simulations of magnetic reconnection starting from a conventional Harris
current sheet. At the earlier stages the evolution is comparable to that of 2D. Later times show
the growth of the LHDI or interchange mode at the front, which creates the well-visible
density ’fingers’ and produces strong variations in the Ex field. We conclude that going
beyond the usual two-dimensional description is necessary to explain the kinetic physics of
the dipolarization fronts. |
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