Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51c1838w&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM51C-1838
Physics
Plasma Physics
[2723] Magnetospheric Physics / Magnetic Reconnection, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [7526] Solar Physics, Astrophysics, And Astronomy / Magnetic Reconnection, [7829] Space Plasma Physics / Kinetic Waves And Instabilities
Scientific paper
A simulation scheme based on gyrokinetic dynamics for electrons and fully kinetic dynamics for ions has been developed [Lin et al., PPCF, 2005] for the purpose of investigation of magnetic reconnection in collisionless plasmas. In this model, the rapid electron cyclotron motion is removed, while retaining the finite electron Larmor radii, wave-particle interaction, and off-diagonal components of the electron pressure tensor. This treatment results in a larger time step and allows one to treat the realistic ion-to-electron mass ratio mi/me in a large-scale system. In this talk, we introduce the GeFi model and present our simulations of (1) tearing mode instability and (2)current-sheet driven instabilities in a Harris sheet using the linearized delta-f GeFi code. The simulation is carried out for a broad range of finite guide field BG and with a realistic mi/me. Code benchmark is conducted against our eigenmode theory of the tearing instability and compared with the asymptotic matching results of Drake and Lee [Phys. Fluids, 1977]. For the current-sheet driven instability, quasi-electrostatic modified two-stream instability/whistler mode is found on the edge of current sheet. In addition, a new mode is found to be confined in the sheet center and carry a compressional By along the direction of electron drift, which may scatter electrons and contribute to the anomalous resistivity in reconnection. The presence of finite BG is found to modify the physics of current sheet significantly.
Chen Leon L.
Kong Wei
Lin Yangtin
Lin Zhangda
Lv Xiaofang
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