Modeling Space Plasma Dynamics with Anisotropic Kappa Distributions
Modeling Space Plasma Dynamics with Anisotropic Kappa Distributions
复制标题
使用各向异性 Kappa 分布模拟空间等离子体动力学
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Schlickeiser
中科院分区：
文献类型：
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作者：
M. Lazar;V. Pierrard;S. Poedts;R. Schlickeiser
空间等离子体不容易发生碰撞，动力学效应普遍导致波动，波动将能量转移到小尺度：波粒相互作用取代碰撞并增强色散效应，加热粒子并产生在太阳风中任何日球层距离上观测到的超热种群。在远距离上，碰撞效率不高，自生的不稳定性限制了太阳风的各向异性，包括热核和超热成分。kappa型的广义幂律是粒子观测分布的最佳拟合模型，是模拟粒子动力学的一种方便的数学工具。但各向异性Kappa模型与观测结果不相关，通常导致不一致的效果。本综述工作的目的是调和一些现有的Kappa模型与观测结果。
Space plasmas are collisionpoor and kinetic effects prevail leading to wave fluctuations, which transfer the energy to small scales: wave-particle interactions replace collisions and enhance dispersive effects heating particles and producing suprathermal populations observed at any heliospheric distance in the solar wind. At large distances collisions are not efficient, and the selfgenerated instabilities constrain the solar wind anisotropy including the thermal core and the suprathermal components. The generalized power-laws of Kappa-type are the best fitting model for the observed distributions of particles, and a convenient mathematical tool for modeling their dynamics. But the anisotropic Kappa models are not correlated with the observations leading, in general, to inconsistent effects. This review work aims to reconcile some of the existing Kappa models with the observations.