Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm34b..01d&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM34B-01
Physics
2744 Magnetotail, 2772 Plasma Waves And Instabilities (2471), 7526 Magnetic Reconnection (2723, 7835), 7833 Mathematical And Numerical Techniques (0500, 3200)
Scientific paper
A need of a trade-off between the comprehensive description of plasmas in particle simulations and limited computer resources available often results in simulations within a relatively small region of the real large system. In this case the role of the boundary conditions on particles and fields becomes very important. Until recently simulations of magnetic reconnection were largely performed using a combination of periodic and conducting boundary conditions. Recently, some characteristic features of those simulation results, including fast reconnection dominated by the Hall-MHD effects and X-line type of the reconnection geometry, have been challenged based on the simulations with the so-called open boundary conditions [Daughton et al., 2006]. The latter conditions include re-injection of particles, which preserves first moments of the distribution function, and radiation boundary conditions on some field components. We present the first results of undriven magnetic reconnection using the fully parallelized particle code P3D [Zeiler et al., 2002] with different sets of open boundary conditions. This simulation setup looks also promising for modeling the spontaneous magnetic reconnection in the tail-like geometry typical of the tail of the magnetosphere. The preliminary results suggest that the onset of reconnection in an open system becomes possible notwithstanding the presence of the finite normal magnetic field, which is big enough to magnetize electrons. Consistent with the concept of the ion tearing mode [Schindler, 1974], the instability develops on the time scales shorter than those of the electron tearing, which develops in a similar Harris current sheet.
Divin A. V.
Drake James F.
Sitnov Mikhail I.
Swisdak Michael
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