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Titel |
A new model for the electron pressure nongyrotropy in the outer electron diffusion region |
VerfasserIn |
Andrey Divin, Vladimir Semenov, Daniil Korovinskiy, Stefano Markidis, Jan Deca, Vyacheslav Olshevsky, 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 |
250138503
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Publikation (Nr.) |
EGU/EGU2017-1540.pdf |
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Zusammenfassung |
We present a new model to describe the electron pressure nongyrotropy inside the electron
diffusion region (EDR) in an antiparallel magnetic reconnection scenario. A combination of
Particle-in-Cell (PIC) simulations and analytical estimates are used to identify such a
component of the electron pressure tensor in the rotated coordinates, which is nearly invariant
along the outflow direction between the X-line and the electron remagnetization points in the
outer EDR. It is shown that the EDR two-scale structure (inner and outer parts) is formed due
to superposition of the nongyrotropic meandering electron population, and gyrotropic
electron population with large anisotropy parallel to the magnetic field upstream of the
EDR. Inside the inner EDR the influence of the pressure anisotropy can largely be
ignored. In the outer EDR, a thin electron layer with electron flow speed exceeding the
E × B drift velocity is supported by large momentum flux produced by the electron
pressure anisotropy upstream of the EDR. We find that this fast electron exhaust flow
with |Ve × B| > |E| is in fact a constituent part of the EDR, a finding which will
steer the interpretation of the Magnetospheric MultiScale mission (MMS) data. |
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