Relativistic non-thermal particle acceleration in two-dimensional collisionless magnetic reconnection

Relativistic non-thermal particle acceleration in two-dimensional collisionless magnetic reconnection
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二维无碰撞磁重联中的相对论非热粒子加速

DOI:
10.1017/s0022377822000046
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发表时间:
2022
影响因子:
2.5
通讯作者:
Uzdensky, Dmitri A.
Uzdensky, Dmitri A.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Uzdensky, Dmitri A.

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磁重联,特别是在相对论范围内,提供了一个有效的机制,加速相对论粒子,从而提供了一个有吸引力的物理解释非热高能辐射从各种天体物理来源。我提出了一个简单的分析模型,阐明了负责重连驱动的相对论非热粒子加速在大系统,等离子体团占主导地位的制度在两个维度的关键物理过程。该模型旨在解释数值观察到的幂律指数的依赖性,直到它们被重新连接的磁场磁化,并最终被困在足够大的等离子体团中以限制它们。该模型还包括扩散费米加速粒子反弹快速移动的等离子体团。我认为,电加速和磁化之间的平衡控制的幂律指数,而捕获在等离子体团管理的截止,从而绑粒子能谱的等离子体团分布。
Magnetic reconnection, especially in the relativistic regime, provides an efficient mechanism for accelerating relativistic particles and thus offers an attractive physical explanation for non-thermal high-energy emission from various astrophysical sources. I present a simple analytical model that elucidates key physical processes responsible for reconnection-driven relativistic non-thermal particle acceleration in the large-system, plasmoid-dominated regime in two dimensions. The model aims to explain the numerically observed dependencies of the power-law index until they become magnetized by the reconnected magnetic field and eventually trapped in plasmoids large enough to confine them. The model also includes diffusive Fermi acceleration by particle bouncing off rapidly moving plasmoids. I argue that the balance between electric acceleration and magnetization controls the power-law index, while trapping in plasmoids governs the cutoff, thus tying the particle energy spectrum to the plasmoid distribution.
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