Electron diffusion region scalings in antiparallel magnetic reconnection

Details Electron diffusion region scalings in antiparallel magnetic reconnection Electron diffusion region scalings in antiparallel magnetic reconnection

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51b1810d&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM51B-1810

Physics

Plasma Physics

[7827] Space Plasma Physics / Kinetic And Mhd Theory, [7835] Space Plasma Physics / Magnetic Reconnection, [7845] Space Plasma Physics / Particle Acceleration

Scientific paper

Collisionless laminar dissipation inside the Electron Diffusion Region (EDR) of magnetic reconnection is investigated. The approximation of the off-diagonal component of electron pressure tensor (known to support the reconnection electric field in collisionless case) is developed [Divin et al., submitted to Physics of Plasmas] in the case of antiparallel symmetric configuration. Combining the proposed pressure closure and the Sweet-Parker-like analysis, a set of EDR scalings is derived. All the typical scales of collisionless reconnection are resolved: the dissipation is found to be similar to Bohm diffusion, the EDR thickness scales with the electron inertial length, and the velocity of accelerated electrons scales with the electron Alfvén velocity. Two-dimensional Particle-in-Cell simulations with implicit code are used to verify the developed model. Open boundary conditions are implemented to avoid the stagnation of magnetic flux and to allow the reconnection exhaust to leave the computational domain and have the full multiscale picture of reconnection. The developed scalings are in good agreement with PIC simulations with open/periodic boundary conditions and for a wide range of mass ratios. Moreover, other kinetic models of EDR are reviewed and their predictions are compared to the developed scalings and PIC simulations.

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