强磁场中大振幅 Alfvén 波驱动的相对论性多级共振与尾场加速
Relativistic multistage resonant and trailing-field acceleration induced by large-amplitude Alfvén waves in a strong magnetic field
AI总结：
提出由强磁场中大振幅 Alfvén 波驱动的多级粒子加速机制，通过 CWRA、GRSA 和 SWRA 联合作用产生高能相对论性电子，为天体物理环境中高能宇宙射线的产生提供见解。
摘要：
我们提出了一种由强磁场中大振幅 Alfvén 波驱动的粒子加速机制。该加速过程通过由衰变不稳定性触发的反向传播波-粒子共振加速（CWRA）经历多个阶段。最初，母 Alfvén 波与子 Alfvén 波垂直于背景磁场共振加速粒子。由此产生的调制不稳定性在波包内产生静电场，这些静电场被 Alfvén 波包的质动力局部放大。随后，这些电场在几个相对论性回旋周期内通过回旋共振冲浪加速（GRSA）驱动进一步加速。在此过程中，v*B 力促进了动量从垂直方向到平行方向的转移。在后期阶段，粒子被母波捕获，并通过单波共振加速（SWRA）获得额外能量。此外，加速粒子的积累在波包后方及尾部感应出静电尾场，从而驱动其他电子的尾场加速（TFA）。CWRA、GRSA 和 SWRA 这些机制的联合作用导致了高度相对论性的电子能量。通过上述过程加速的电子能量高于通过 TFA 加速的电子能量。这种多级加速过程为天体物理环境中高能宇宙射线的产生提供了深刻见解。
英文摘要：
We propose a particle acceleration mechanism driven by large-amplitude Alfvén waves in a strong magnetic field. The acceleration process proceeds through multiple stages triggered by counterpropagating wave-particle resonant acceleration (CWRA) via decay instability. Initially, parent and daughter Alfvén waves resonantly accelerate particles perpendicular to the ambient magnetic field. The resultant modulational instability generates electrostatic fields within the wave packet, which are locally amplified by the ponderomotive force of the Alfvén wave packet. These fields subsequently drive further acceleration within a few relativistic gyroperiods via gyroresonant surfing acceleration (GRSA). During this, the v*B force facilitates momentum transfer from the perpendicular to the parallel direction. In the later stage, particles become trapped by the parent wave and gain additional energy through single wave resonant acceleration (SWRA). Furthermore, the accumulation of accelerated particles induces electrostatic trailing fields behind and at the tail of the wave packet, which drive trailing-field acceleration (TFA) of other electrons. The combined effects of these mechanisms, CWRA followed by GRSA and SWRA, result in highly relativistic electron energy. The electron energy accelerated through the above process is higher than that accelerated through TFA. This multistage acceleration process provides insights into the generation of high energy cosmic rays in astrophysical environments.
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