Regularized κ-distributions with non-diverging moments
Regularized κ-distributions with non-diverging moments
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DOI：
10.1209/0295-5075/120/50002
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发表时间：
2017-12-01
期刊：
影响因子：
1.8
通讯作者：
Lazar, M.
中科院分区：
文献类型：
--
作者：
Scherer, K.;Fichtner, H.;Lazar, M.
对于各种等离子体应用的所谓的（非相对论）卡帕分布被广泛用于再现和解释超热粒子人口呈现幂律分布的速度或能量。尽管它的声誉标准卡帕分布作为一个概念仍然是有争议的，主要是由于速度矩M-1，使宏观表征可能，但其存在仅限于低阶l < 2卡帕-1。事实上，卡帕分布本身的定义是以存在阶数l = 2的矩为条件的（即，动力学温度）仅满足Kappa > 3/2。为了解决这些关键的限制，我们引入了正则化卡帕分布与非发散的时刻。对于所有的速度矩的评价一般的分析表达式提供了一个重要的一步，使宏观（流体状）的空间等离子体的描述，并在一般情况下，任何系统的卡帕分布粒子。版权所有（C）EPLA，2018
For various plasma applications the so-called (non-relativistic) kappa-distribution is widely used to reproduce and interpret the suprathermal particle populations exhibiting a power-law distribution in velocity or energy. Despite its reputation the standard kappa-distribution as a concept is still disputable, mainly due to the velocity moments M-l which make a macroscopic characterization possible, but whose existence is restricted only to low orders l < 2 kappa - 1. In fact, the definition of the kappa-distribution itself is conditioned by the existence of the moment of order l = 2 (i.e., kinetic temperature) satisfied only for kappa > 3/2. In order to resolve these critical limitations we introduce the regularized kappa-distribution with non-diverging moments. For the evaluation of all velocity moments a general analytical expression is provided enabling a significant step towards a macroscopic (fluid-like) description of space plasmas, and, in general, any system of kappa-distributed particles. Copyright (C) EPLA, 2018