Investigation of Tearing Instability Using GeFi Particle Simulation Model

Details Investigation of Tearing Instability Using GeFi Particle Simulation Model Investigation of Tearing Instability Using GeFi Particle Simulation Model

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23b2043w&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM23B-2043

Physics

Plasma Physics

[2753] Magnetospheric Physics / Numerical Modeling, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7835] Space Plasma Physics / Magnetic Reconnection, [7839] Space Plasma Physics / Nonlinear Phenomena

Scientific paper

The GeFi particle simulation model has been thoroughly benchmarked and validated for Harris current sheet with a finite guide field. Both the linear and nonlinear tearing instabilities obtained from the GeFi simulations are compared with the Darwin particle-in-cell (PIC) simulation, and the GeFi simulation results are found to be consistent with those from the PIC simulation. Meanwhile, the GeFi simulation is carried out to investigate both the linear and nonlinear tearing instabilities for cases with a broad range of current sheet half-width L and guide magnetic field BG. It is found that in a wide current sheet with L> 4.5 ρeK the nonlinear saturation level of the island half-width is ws~3 ρeK , where ρeK = ρe Bx0/B0, B0 is the strength of the asymptotic magnetic field, and Bx0 is the antiparallel magnetic field. On the other hand, in a thin current sheet width L<2.5 ρeK, ws~2.2L. A high frequency electrostatic drift mode is found to coexist with the tearing mode. In addition, the magnetic merging process associated with magnetic island coalescence is investigated using the GeFi simulation model.

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