Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm31e..08h&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM31E-08
Physics
7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies
Scientific paper
The reconnection of anti-parallel magnetic field is facilitated by the demagnetization of electrons in the inner diffusion region. Inertial effects due to electron bounce motions in the field reversal region have as their macroscopic manifestations nongyrotropies in the electron pressure tensor. The electric field maintained by the intermittent electron acceleration in the inner diffusion region, or, equivalently, by the divergence of the electron pressure tensor, provides the reconnection electric field. In the case of a significant guide magnetic field, however, electron may be magnetized and thus not able to execute bounce motions in the inner diffusion region. As a result, the structure of the diffusion region is quite different from that of anti-parallel reconnection. We will present a detailed investigation of the reconnection layer for component reconnection, based primarily on analytical arguments and supported by particle-in-cell simulations. We will demonstrate that mixing of electron distributions from within and from adjacent to the thin, central electron current layer can provide electron nongyrotropies, with similar macroscopic consequences as in the anti-parallel case.
Birn Joachim
Hesse Matthias
Kuznetsova Masha
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