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| Titel |
The mechanisms of electron acceleration in antiparallel and guide field reconnection |
| VerfasserIn |
Quanming Lu, Can Huang, Rongsheng Wang, Shui Wang |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250049482
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| Zusammenfassung |
| Two-dimensional particle-in-cell simulations are performed to investigate electron dynamics in
antiparallel and guide field 'in the presence of a strong guide field' magnetic reconnection, and the
mechanisms of electron acceleration are compared. In the antiparallel reconnection, the dominant
acceleration occurs in the vicinity of the X line, where the magnetic field is weak. Most of these
electrons come from the regions just outside of the separatrices, which move into the vicinity of the
X line along the magnetic field lines. Electrons can also be nonadiabatically accelerated in the pileup
region by the reconnection electric field, where the gyroradii of the electrons are comparable to the
curvature radii of the magnetic field lines. Most of these electrons come from the regions inside of
the separatrices, which move into the pileup region along the magnetic field lines. In the guide field
reconnection, electrons are accelerated by the parallel electric field. They are firstly accelerated
when moving toward the X line along the magnetic field lines, and then are further accelerated when
they are funneled into the vicinity of the X line. Most of energetic electrons come from the region
outside of the pair of the negative separatrices. The efficiency of such an acceleration mechanism is
obviously higher than that in the antiparallel reconnection. In both the antiparallel and guide field
reconnection, the mechanisms of electron acceleration favor the electrons with higher initial
energy. © |
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