|Magnetic ramp scale at supercritical perpendicular collisionless shocks: Fullparticle electromagnetic simulations|
|Zhongwei Yang; Quanming Lu; Xinliang Gao; Can Huang; Huigen Yang; Ying Liu; Hongqiao Hu; Desheng Han; 北京8701信箱
|Source Publication||Physics of Plasmas
|Abstract||Supercritical perpendicular collisionless shocks are known to exhibit foot, ramp, and overshoot
structures. The shock ramp structure is in a smaller scale in contrast to other microstructures (foot
and overshoot) within the shock front. One-dimensional full particle simulations of strictly
perpendicular shocks over wide ranges of ion beta bi, Alfv en Mach number MA, and ion-to-electron
mass ratio mi/me are presented to investigate the impact of plasma parameters on the shock ramp
scale. Main results are (1) the ramp scale can be as small as several electron inertial length. (2) The
simulations suggest that in a regime below the critical ion beta value, the shock front undergoes a
periodic self-reformation and the shock ramp scale is time-varying. At higher ion beta values, the
shock front self-reformation is smeared. At still higher ion beta value, the motion of reflected ions is
quite diffuse so that they can lead to a quasi-steady shock ramp. Throughout the above three
conditions, the shock ramp thickness increases with bi. (3) The increase (decrease) in Mach number
and the decrease (increase) in the beta value have almost equivalent impact on the state
(i.e., stationary or nonstationary) of the shock ramp. Both of front and ramp thicknesses are increased
with MA.VC 2013 AIP Publishing LLC.|
Zhongwei Yang,Quanming Lu,Xinliang Gao,et al. Magnetic ramp scale at supercritical perpendicular collisionless shocks: Fullparticle electromagnetic simulations[J]. Physics of Plasmas,2013,20:092116.
Zhongwei Yang.,Quanming Lu.,Xinliang Gao.,Can Huang.,Huigen Yang.,...&北京8701信箱.(2013).Magnetic ramp scale at supercritical perpendicular collisionless shocks: Fullparticle electromagnetic simulations.Physics of Plasmas,20,092116.
Zhongwei Yang,et al."Magnetic ramp scale at supercritical perpendicular collisionless shocks: Fullparticle electromagnetic simulations".Physics of Plasmas 20(2013):092116.
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