Physics – Plasma Physics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106.3721h&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue A3, p. 3721-3736
Physics
Plasma Physics
88
Magnetospheric Physics: Numerical Modeling, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Space Plasma Physics: Magnetic Reconnection
Scientific paper
Particle-in-cell simulations are used to investigate collisionless magnetic reconnection in thin current sheets, based on the configuration chosen for the Geospace Environment Modeling (GEM) magnetic reconnection challenge [Birn et al., this issue]. The emphasis is on the overall evolution, as well as details of the particle dynamics in the diffusion region. Here electron distributions show clear signatures of nongyrotropy, whereas ion distributions are simpler in structure. The investigations are extended to current sheets of different widths. Here we derive a scaling law for the evolution dependence on current sheet width. Finally, we perform a detailed comparison between a kinetic and Hall-magnetohydrodynamic model of the same system. The comparison shows that although electric fields appear to be quite similar, details of the evolution appear to be considerably different, indicative of the role of further anisotropies in the ion pressures.
Birn Joachim
Hesse Michael
Kuznetsova Masha
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