| 垂直激波条件下能量粒子加速机制的模拟研究 |
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| 引用本文： | 孙鹏,秦刚,王赤. 垂直激波条件下能量粒子加速机制的模拟研究[J]. 空间科学学报, 2007, 27(6): 441-447. DOI: 10.11728/cjss2007.06.441 |
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| 作者姓名： | 孙鹏 秦刚 王赤 |
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| 作者单位： | 中国科学院空间科学与应用研究中心,空间天气学国家重点实验室,北京,100080;中国科学院研究生院;中国科学院空间科学与应用研究中心,空间天气学国家重点实验室,北京,100080 |
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| 基金项目： | 国家自然科学基金(40523006，40325010) |
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| 摘 要： | 在具有湍动的磁场和垂直激波条件下对大量测试粒子的轨迹进行了数值计算,研究了激波强度和粒子初始能量对于粒子穿越激波的平均能量变化的影响,分析了漂移加速(SDA)在不同条件下对粒子加速的贡献,并给出了一个与数值结果相符合的漂移加速理论公式△E=amvivup(1-1/s).结果表明,加入磁场湍流后,垂直激波条件下粒子仍主要受到漂移加速作用,而基于粒子引导中心的耗散漂移加速理论在此条件下失效.
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| 关 键 词： | 高能粒子 激波加速 漂移加速 耗散加速 垂直激波 磁湍流 |
| 文章编号： | 0254-6124/2007/27(6)-441-07 |
| 收稿时间： | 1900-01-01 |
| 修稿时间： | 2007-03-26 |
Study of Energetic Particle's Acceleration Mechanism at Perpendicular Shock With Particle Simulation Results |
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| SUN Peng,QIN Gang,WANG Chi. Study of Energetic Particle's Acceleration Mechanism at Perpendicular Shock With Particle Simulation Results[J]. Chinese Journal of Space Science, 2007, 27(6): 441-447. DOI: 10.11728/cjss2007.06.441 |
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| Authors: | SUN Peng QIN Gang WANG Chi |
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| Affiliation: | 1.State Key Laboratory for Space Weather, Center for Space Science and Applied Research Chinese Academy of Sciences, Beijing 1000802.Graduate University of Chinese Academy of Sciences |
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| Abstract: | Large amount of test particles＇ trajectories at perpendicular shock with magnetic turbulence are calculated. And the effect of shock strength and particles＇ initial energy to the average energy change per shock-crossing is also studied. Furthermore, the test particle＇s energy gain from Shock Drift Acceleration （SDA） under different conditions is analysed, too. In addition, a theoretical （1） formula △E=arnvivup（1-1/s） is given for SDA, which agrees very well with our simulation results. The results show that, although magnetic turbulence is included, particles would still be accelerated mainly by SDA at perpendicular shock, while the diffusive shock acceleration, based on the guiding center assumption, is not valid. |
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| Keywords: | Energetic particles Shock acceleration Shock Drift Acceleration (SDA) Diffusive shock acceleration Perpendicular shock Magnetic turbulence |
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