| 垂直无碰撞激波的离子加速机制 |
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| 引用本文： | 杨忠炜,陆全明,郭俊,王水.垂直无碰撞激波的离子加速机制[J].地球物理学报,2008,51(4):953-959. |
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| 作者姓名： | 杨忠炜 陆全明 郭俊 王水 |
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| 作者单位： | 1.中国科学技术大学地球和空间科学学院 中国科学院基础等离子体物理重点实验室，合肥 230026;2.中国科学院空间天气学国家重点实验室，北京 100080;3.青岛科技大学数理学院，青岛 266041 |
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| 摘 要： | 利用一维全粒子模拟得到的垂直无碰撞激波的位形，通过试验粒子方法研究了不同初始能量粒子的激波加速机制.将与激波相互作用的离子分成反射和直接穿过两类，发现只有被激波反射的离子可被激波明显加速，其中初始能量较小的反射离子通过激波冲浪机制加速，而初始能量较大的离子通过激波漂移加速机制加速.同时激波厚度还对离子被加速过程有重要影响.
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| 关 键 词： | 无碰撞激波 高能粒子 冲浪加速 漂移加速 |
| 收稿时间： | 2007-12-7 |
| 修稿时间： | 2008-3-10 |
Mechanism of ion acceleration at perpendicular collisionless shocks |
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| YANG Zhong-Wei,LU Quan-Ming,GUO Jun,WANG Shui.Mechanism of ion acceleration at perpendicular collisionless shocks[J].Chinese Journal of Geophysics,2008,51(4):953-959. |
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| Authors: | YANG Zhong-Wei LU Quan-Ming GUO Jun WANG Shui |
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| Institution: | 1.Key Laboratory of Basic Plasma Physics，University of Science and Technology of China，Chinese Academy of Sciences，Hefei 230026，China;2.Key Laboratory for Space Weather，Chinese Academy of Sciences，Beijing 100080，China;3.School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao 266041, China |
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| Abstract: | With one-dimensional(1D)perpendicular collisionless shocks obtained by full particle simulation,the mechanisms of shock acceleration of various initial energetic particles are investigated by using test particle method.The results show that the ions can be separated into two groups at the shock front:the reflected ions and the directly transmitted ions.Only the reflected ions can be accelerated significantly.Moreover,the lower initial energy ions are accelerated by shock surfing mechanism,and the higher initial energy ions gain energy by shock drift acceleration.Meanwhile,the thickness of the shock can significantly affect the acceleration process of ions. |
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| Keywords: | Collisionless shock Energetic ions Surfing acceleration Drift acceleration |
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