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| Titel |
Interchange instability development in dipolarization front structure during reconnection in collisionless 3D PIC simulations |
| VerfasserIn |
A. Vapirev, A. Divin, S. Markidis, G. Lapenta |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250062408
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| Zusammenfassung |
| Massive parallel numerical simulations of magnetic reconnection are presented
in this study. Electromagnetic full-particle implicit code iPIC3D is used to study
the dynamics and 3D evolution of reconnection outflows. Such features as Hall
magnetic field, inflow and outflow and diffusion region formation are very similar
to 2D PIC simulations. In addition, it is well known that instabilities develop in
the current flow direction or oblique directions. These modes could provide for
anomalous resistivity and diffusive drag and can serve as additional proxies for magnetic
reconnection. In our work the unstable evolution of reconnection jets are studied.
Guide field and anti-parallel reconnection configurations are considered. Our study
suggests that interchange instability leads to the development of finger-like density
structures on ion-electron hybrid scales. These structures are characterized by a rapid
increase of the magnetic field, normal to the current sheet (Bz). A small negative
dip in Bz component is observed in the region ahead of the dipolarization front.
Strong fluctuations in the Bx and By components are also observed shortly after the
passing of the dipolarization front. The instability forms due to fact that the density
gradient inside the dipolarization front region is opposite to the direction of the
acceleration Lorentz force. Such density structures may possibly further develop
into larger-scale Earthward flux transfer events during magnetotail reconnection. |
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