Scattering of Superthermal Ions at Shocks: Dependence on Energy

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Pub Date : 2023-11-01 DOI:10.3847/1538-4357/ad04dd
Michael Gedalin, Natalia Ganushkina, Nikolai V. Pogorelov, Vadim Roytershteyn
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Abstract

Abstract Diffusive shock acceleration requires the production of backstreaming superthermal ions (injection) as a first step. Such ions can be generated in the process of scattering of ions in the superthermal tail off the shock front. Knowledge of the scattering of high-energy ions is essential for matching conditions of upstream and downstream distributions at the shock transition. Here we analyze the generation of backstreaming ions as a function of their initial energy in a model stationary shock and in a similar rippled shock. Rippling substantially enhances ion reflection and the generation of backstreaming ions for slightly and moderately superthermal energies, and thus is capable of ensuring ion injection into a further diffusive shock acceleration process. For high-energy ions, there is almost no difference in the fraction of backstreaming ions produced and the ion distributions between the planar stationary shock and the rippled shock.
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过热离子在冲击中的散射:对能量的依赖
扩散冲击加速的第一步需要产生回流超热离子(注入)。这种离子可以在离子在激波前沿的超热尾翼散射的过程中产生。了解高能离子的散射对于匹配激波跃迁时上下游分布的条件是必不可少的。在这里,我们分析了回流离子在模型静止冲击和类似的波纹冲击中作为初始能量的函数的产生。波纹极大地增强了离子反射和轻微和中度超热能量下回流离子的产生,从而能够确保离子注入到进一步的扩散冲击加速过程中。对于高能离子,平面静止激波和波纹激波在产生回流离子的比例和离子分布上几乎没有差异。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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