论文标题
对非平衡空间等离子体中的传输系数进行现实评估
Towards a realistic evaluation of transport coefficients in non-equilibrium space plasmas
论文作者
论文摘要
最近的研究概述了在空间等离子体中评估运输系数的兴趣,在该空间等离子体中,观察到的血浆颗粒的速度分布不仅由二进制碰撞(例如,在低能量下)进行调节,而且还取决于颗粒与波湍流和波动的相互作用,从而产生颗粒的能量。本文提供了基于正规化KAPPA分布(RKD)的主要传输系数的第一个估计,该系数与标准的Kappa分布(SKDS)不同,可以实现宏观参数化,而无需数学差异或物理不一致。此处得出的所有传输系数,即扩散和迁移率系数,电导率,热电系数和热导率,对于所有$κ> 0 $的值都有限且定义得很好。此外,对于低值$κ$(即在SKD极点以下)的低值,传输系数的幅度可能高于相应的麦克斯韦限制,这意味着,如果忽略了上部电子,则可以显着低估。
Recent studies have outlined the interest for the evaluation of transport coefficients in space plasmas, where the observed velocity distributions of plasma particles are conditioned not only by the binary collisions, e.g., at low energies, but also by the energisation of particles from their interaction with wave turbulence and fluctuations, generating the suprathermal Kappa-distributed populations. This paper provides a first estimate of the main transport coefficients based on regularised Kappa distributions (RKDs), which, unlike standard Kappa distributions (SKDs), enable macroscopic parameterisation without mathematical divergences or physical inconsistencies. All transport coefficients derived here, i.e., the diffusion and mobility coefficients, electric conductivity, thermoelectric coefficient and thermal conductivity, are finite and well defined for all values of $κ> 0$. Moreover, for low values of $κ$ (i.e., below the SKD poles), the transport coefficients can be orders of magnitudes higher than the corresponding Maxwellian limits, meaning that significant underestimations can be made if suprathermal electrons are ignored.