arXiv 1006.26622010-06-14astro-ph.SR

Alfven波产生平行电场turbulence

Parallel electric field generation by Alfven wave turbulence

N. H. Bian, E. P. Kontar, J. C. Brown

DOI：: 10.1051/0004-6361/201014048

摘要：

{This工作的目的是研究在太阳耀斑等离子体条件下，由强各向异性和平衡Alfvenic湍流产生的平行电场的光谱结构与热粒子数电子加速问题的关系。{We考虑存在强背景磁场时的各向异性阿尔文涨落。利用这种各向异性，一组减少非线性，双流体等离子体动力学方程推导。该模型的低$β$极限用于跟踪动力学阿尔芬波之间的非线性相互作用产生的能量的湍流级联，从具有$k_{\perp}ρ_{s}\ll 1$的大磁流体动力学（MHD）尺度到具有$k_{\perp}ρ_{s} \gg 1$的小“动力学”尺度，$ρ_{s}$是离子声音回旋半径。{获得了湍流电磁涨落幅度与$k_{\perp}$和$k_{\parallel}$的函数关系，表明在大MHD尺度下，电场产生一个平行于磁场的分量。} {The我们导出的平行电场起伏谱可以有效地用于模拟太阳耀斑等离子体条件下Alfven波对电子的随机共振加速和加热

英文摘要：

{This work aims to investigate the spectral structure of the parallel electric field generated by strong anisotropic and balanced Alfvenic turbulence in relation with the problem of electron acceleration from the thermal population in solar flare plasma conditions.} {We consider anisotropic Alfvenic fluctuations in the presence of a strong background magnetic field. Exploiting this anisotropy, a set of reduced equations governing non-linear, two-fluid plasma dynamics is derived. The low-$β$ limit of this model is used to follow the turbulent cascade of the energy resulting from the non-linear interaction between kinetic Alfven waves, from the large magnetohydrodynamics (MHD) scales with $k_{\perp}ρ_{s}\ll 1$ down to the small "kinetic" scales with $k_{\perp}ρ_{s} \gg 1$, $ρ_{s}$ being the ion sound gyroradius.} {Scaling relations are obtained for the magnitude of the turbulent electromagnetic fluctuations, as a function of $k_{\perp}$ and $k_{\parallel}$, showing that the electric field develops a component parallel to the magnetic field at large MHD scales.} {The spectrum we derive for the parallel electric field fluctuations can be effectively used to model stochastic resonant acceleration and heating of electrons by Alfven waves in solar flare plasma conditions}

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文