Simulation of Current Sheet Instabilities Using Gygokinetic Electron and Fully Kinetic Ion Particle Code

Details Simulation of Current Sheet Instabilities Using Gygokinetic Electron and Fully Kinetic Ion Particle Code Simulation of Current Sheet Instabilities Using Gygokinetic Electron and Fully Kinetic Ion Particle Code

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31b1723l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM31B-1723

Physics

2723 Magnetic Reconnection (7526, 7835), 2753 Numerical Modeling, 7829 Kinetic Waves And Instabilities, 7833 Mathematical And Numerical Techniques (0500, 3200), 7845 Particle Acceleration

Scientific paper

A novel gyrokinetic electron and fully kinetic ion (GKe/FKi) particle simulation model 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. The model is particularly suitable for ω < Ωe and k∥/ k⊥<1, and for problems in which the wave modes ranging from Alfven waves to lower-hybrid/whistler waves need to be handled on an equal footing. In this talk, we introduce the GKe/FKi model and present our simulation of instabilities of Harris sheet under a broad range of finite guide field BG and with a realistic mi/me using the linearized δ f GKe/FKi code [Wang et al., PoP, 2008]. The simulation is carried out in the 2-D plane containing the guide field in the y direction and the current sheet normal along z. For a finite BG/Bx0<1, where Bx0 is the asymptotic anti-parallel field component, quasi-electrostatic modified two-stream instability/whistler mode are 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 δ By along the direction of electron drift, and may contribute directly to the electron anomalous resistivity in reconnection. For BG/Bx0≫1, the wave modes evolve to a globally propagating instability. The presence of finite BG is found to modify the physics of current sheet significantly.

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