Stochastic acceleration by the induced electric field versus the Fermi acceleration
Stochastic acceleration by the induced electric field versus the Fermi acceleration
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DOI：
10.1088/0953-4075/43/18/185701
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发表时间：
2010-09
期刊：
影响因子：
--
通讯作者：
Y. Fedorov;M. Stehlík
中科院分区：
文献类型：
--
作者：
Y. Fedorov;M. Stehlík
在扩散近似下，利用动力学方程研究了统计各向异性螺旋湍流磁场中高能粒子的加速问题。众所周知，在具有统计各向异性磁流体动力学湍流的介质中会产生大尺度的磁场和电场。如果湍流介质的磁螺旋度足够高，大尺度电场对粒子的加速是非常有效的。这种加速机制的有效性进行了比较与费米加速的二阶。研究了稳态宇宙线能谱及其在两个加速过程接近平衡态时的演化。
The acceleration of energetic particles is investigated using the kinetic equation in a statistically anisotropic helical turbulent magnetic field in the diffusion approximation. It is known that large-scale magnetic and electric fields are generated in a medium with statistically anisotropic magnetohydrodynamic turbulence. The particle acceleration by the large-scale electric field can be very efficient if the magnetic helicity of a turbulent medium is sufficiently high. The effectiveness of this acceleration mechanism is compared with the Fermi acceleration of the second order. The steady-state cosmic ray energetic spectra as well as their evolution during their approach to an equilibrium state of both acceleration processes are studied.