摘要
The time evolution of the cross-shock electrostatic potential jump during one specific high Mach number quasi-parallel shock reformation cycle is examined via a 1D hybrid simulation.It is shown that when the average value of the electrostatic potential jump is low,its instant value can be large so that the shock is in a favorable profile to directly reflect the incident ions.Our simulation also suggests that,for the ones that finally become injected ions(which can be further accelerated by diffusive shock acceleration mechanism),the first step of their reflections should be mainly attributed to the electrostatic potential jump,instead of the magnetic force,as stated in some previous studies.
作者
苏彦青
陆全明
SU Yan-Qing;LU Quan-Ming(CAS Key Laboratory of Basic Plasma Physics,Department of Geophysics and Planetary Science,University of Science and Technology of China,Hefei 230026;State Key Laboratory of Space Weather,Chinese Academy of Sciences,Beijing 100190)
基金
Supported by the National Natural Science Foundation of China under Grant Nos 40931053,41174114 and 41121003
the Ocean Public Welfare Scientific Research Project,State Oceanic Administration People’s Republic of China(No 201005017)
the Fundamental Research Funds for the Central Universities(WK2080000010).