论文标题
在磁场中带电颗粒传输的扩散诱变系数的理论推导
Theoretical derivation of diffusion-tensor coefficients for the transport of charged particles in magnetic fields
论文作者
论文摘要
通过扩散过程描述了在磁场渗透的各种天体物理环境中带电颗粒的转运，该过程依赖于通常从蒙特卡洛模拟中推断出的扩散诱变参数。基于红色噪声近似，以模拟通过带电颗粒连续两个时间之间经历的磁场的两点相关函数，以前在纯湍流的情况下，以前得出了扩散张量系数。在对ECRS2022的贡献中，该推导延伸到湍流顶部平均场的情况。该结果适用于各种天体物理环境的颗粒半径与湍流波长的功率谱（陀螺仪谐振机制）的功率谱，或者Larmor半径大于最大的湍流波长（高rigigigities formime）。
The transport of charged particles in various astrophysical environments permeated by magnetic fields is described in terms of a diffusion process, which relies on diffusion-tensor parameters generally inferred from Monte-Carlo simulations. Based on a red-noise approximation to model the two-point correlation function of the magnetic field experienced by charged particles between two successive times, the diffusion-tensor coefficients were previously derived in the case of pure turbulence. In this contribution to ECRS2022, the derivation is extended to the case of a mean field on top of the turbulence. The results are applicable to a variety of astrophysical environments in regimes where the Larmor radius of the particles is resonant with the power spectrum of the turbulence wavelength (gyro-resonant regime), or where the Larmor radius is greater than the largest turbulence wavelength (high-rigidity regime).
