On the Effect of Reduced Ion-Electron Mass Ratio in the Kinetic Plasma Simulation

Details On the Effect of Reduced Ion-Electron Mass Ratio in the Kinetic Plasma Simulation On the Effect of Reduced Ion-Electron Mass Ratio in the Kinetic Plasma Simulation

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh23a1166l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH23A-1166

Other

2109 Discontinuities (7811), 7811 Discontinuities (2109), 7815 Electrostatic Structures, 7827 Kinetic And Mhd Theory, 7833 Mathematical And Numerical Techniques (0500, 3200)

Scientific paper

In order to simulate the ion-time-scale phenomena, the reduced ion-electron mass ratio is commonly used in the fully kinetic plasma simulation. In this study, we use the contact discontinuity (CD) as an example to examine how the reduced ion-electron mass ratio might affect the simulation results under different initial conditions. We first derive the stable jump condition of the CD in ion-electron two-fluid plasma. We then use the electrostatic Vlasov simulation and the electromagnetic particle code simulation to study the CDs with different ion-electron mass ratio and with the initial conditions which satisfy the MHD jump conditions but may or may not satisfy the stable two-fluid jump conditions. Our simulation results indicate that the simulation results with reduced ion- electron mass ratio is reliable only when the initial condition is close enough to the final equilibrium state. Results obtain in this study can explain the reason why the conclusions are opposite to each other in the previous simulation studies of CDs (Wu et al., 1994; Lapenta and Brackbill, 1996).

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