Electron heating and acceleration in high Mach number shocks
高马赫数冲击中的电子加热和加速
基本信息
- 批准号:12640430
- 负责人:
- 金额:$ 2.24万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2000
- 资助国家:日本
- 起止时间:2000 至 2001
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
It is known that the efficient energy transfer from ions to electron occurs in the shock transition layer, where the supersonic flow in upstream is transformed into the subsonic flow in downstream. It is also expected that the non-thermal, high-energy electron are simultaneously produced by the wave-particle interaction under the turbulence electromagnetic fields. In our study, we found the rapid energization of high-energy electron which time scale is much shorter than that for the standard diffusive/Fermi acceleration mechanism by using particle-in-cell simulations. So far the turbulent plasma waves is thought to play an important role in the shock transition layer, but it is discovered by in situ satellite observations that a large amplitude, electrostatic solitary wave is also excited in the shock transition layer. Having the solitary wave in mind, we studied how the solitary wave can be generated in the shock region, and how the solitary wave can contribute to the electron acceleration. Our new results are summarized as follows : 1) the electrostatic, solitary wave can be generated by the two-stream instability under the reflected ions from the shock and the incoming electrons in a super-critical Mach number regime, 2) some electrons can be effectively trapped by the electrostatic field through the shock surfing acceleration, which results in the formation of the nonthermal electrons, and 3) the electrons can be infinitely accelerated up to the relativistic energy if the shock Mach number exceed about several 10s. We also discussed that the electron shock surfing acceleration can be applied for the high-energy population observed in super-nova shocks as well as the interplanetary shocks.
在激波过渡层中,离子向电子的有效能量传递是由上游的超声速流转变为下游的亚音速流。在湍流电磁场的作用下,波粒相互作用可以同时产生非热的高能电子。在我们的研究中,我们发现了快速的高能电子振荡的时间尺度比标准的扩散/费米加速机制短得多,通过使用粒子在细胞模拟。迄今为止,人们一直认为湍流等离子体波在激波过渡层中起着重要作用,但卫星原位观测发现,激波过渡层中也激发出了一种大振幅的静电孤立波。考虑到孤立波的存在,我们研究了孤立波如何在激波区产生,以及孤立波如何对电子加速起作用。我们的新结果总结如下:1)在超临界马赫数范围内,激波反射离子和入射电子的双流不稳定性可以产生静电孤波; 2)通过激波冲浪加速,静电场可以有效地捕获部分电子,从而形成非热电子;(3)当激波马赫数超过几十秒时,电子可以被无限加速到相对论能量。我们还讨论了电子激波冲浪加速可以应用于超新星激波和行星际激波中观测到的高能粒子布居。
项目成果
期刊论文数量(27)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
M.Hoshino: "Slow Shock Downstream Structure in the Magnetotail"J.Geophys.Res.. 105. 333-347 (2000)
M.Hoshino:“磁尾中的慢冲击下游结构”J.Geophys.Res.. 105. 333-347 (2000)
- DOI:
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- 影响因子:0
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- 通讯作者:
S.Zenitani: "Generation of non-thermal particles in relativistic magnetic reconnection of pair plasmas"Astrophys. J. Letts.. 562. L63-L66 (2001)
S.Zenitani:“等离子体对相对论磁重联中非热粒子的生成”天体物理学。
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- 影响因子:0
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N.Shimada: "Strong electron acceleration at high Mach number shock waves : Simulation study of electron dynamics"Astrophys. J. Lett.. 543. L67-L71 (2000)
N.Shimada:“高马赫数冲击波下的强电子加速:电子动力学的模拟研究”天体物理学。
- DOI:
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- 影响因子:0
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M.Hoshino: "Suprathermal electron acceleration in magnetic reconnection"J. Geophys. Res.. 106. 25979-25998 (2001)
M.Hoshino:“磁重联中的超热电子加速”J。
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- 影响因子:0
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Y.Kasaba: "Magnetosheath electrons in anomalously low density solar wind observed by Geotail"Geophys.Res.Lett. 27. 3253-3256 (2000)
Y.Kasaba:“Geotail 观测到的异常低密度太阳风中的磁鞘电子”Geophys.Res.Lett。
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HOSHINO Masahiro其他文献
HOSHINO Masahiro的其他文献
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{{ truncateString('HOSHINO Masahiro', 18)}}的其他基金
Magnetic Field Generation under Interaction between Radiation Field and Plasma
辐射场与等离子体相互作用产生磁场
- 批准号:
22654068 - 财政年份:2010
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Particle Acceleration and Dynamics of Relativistic Plasma SheetMediated by Radiation Loss
辐射损失介导的相对论性等离子体片的粒子加速和动力学
- 批准号:
22340169 - 财政年份:2010
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Wakefield Acceleration in Relativistic Shock Waves
相对论冲击波中的韦克菲尔德加速
- 批准号:
19340171 - 财政年份:2007
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
A new approach to the tripartite relations among China, South Korea and North Korea.
中韩朝三方关系新思路。
- 批准号:
19510256 - 财政年份:2007
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$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Nonthermal High Energy Electron Acceleration from Shock Transition Region to Downstream Region
从激波过渡区到下游区的非热高能电子加速
- 批准号:
14340144 - 财政年份:2002
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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