Magnetic ramp scale at supercritical perpendicular collisionless shocks: Fullparticle electromagnetic simulations

	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
刊名	Physics of Plasmas
	2013
卷号	20 页码:092116
ISSN号	1070-664X
通讯作者	北京8701信箱
中文摘要	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.
学科主题	空间物理
语种	英语
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/1513]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	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.
APA	Zhongwei Yang.,Quanming Lu.,Xinliang Gao.,Can Huang.,Huigen Yang.,...&Desheng Han.(2013).Magnetic ramp scale at supercritical perpendicular collisionless shocks: Fullparticle electromagnetic simulations.Physics of Plasmas,20,092116.
MLA	Zhongwei Yang,et al."Magnetic ramp scale at supercritical perpendicular collisionless shocks: Fullparticle electromagnetic simulations".Physics of Plasmas 20(2013):092116.