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arXiv 1111.1112astro-ph.HEphysics.plasm-ph
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吸积盘的环序列分解:粘阻方法

Ring sequence decomposition of an accretion disk: the viscoresistive approach

Riccardo Benini, Giovanni Montani, Jacopo Petitta

摘要:

我们分析了一个薄吸积盘的二维粘阻磁流体动力学(MHD)模型,该模型将[Coppi(2005),Coppi and Rousseau(2006)]中概述的晶体结构与天体物理吸积系统的真实微观和宏观特征相协调。特别是,我们认为小的耗散效应(粘度和电阻率,其特征在于磁普朗特数的顺序单位),极向物质通量和环形分量的磁场。这些新的成分使我们能够建立完整的平衡剖面,包括动量守恒方程的方位角分量和电子力平衡关系。这两个额外的方程,这是相同的满足在原来的模型中,允许我们处理非零的径向和垂直的物质通量,我们构建的全球平衡系统的解决方案提供了一个完整的描述等离子体盘内的径向和垂直的依赖。我们分析的主要问题是概述了调制的物质分布在磁盘中对应于形成一个环状序列,在这里与相应的径向振荡的物质通量。

英文摘要:

We analyze a two dimensional viscoresistive magnetohydrodynamical (MHD) model for a thin accretion disk which reconciles the crystalline structure outlined in [Coppi(2005), Coppi and Rousseau(2006)] with real microscopic and macroscopic features of astrophysical accreting systems. In particular, we consider small dissipative effects (viscosity and resistivity, characterized by a magnetic Prandtl number of order unity), poloidal matter fluxes and a toroidal component of the magnetic field. These new ingredients allow us to set up the full equilibrium profile including the azimuthal component of the momentum conservation equation and the electron force balance relation. These two additional equations, which were identically satisfied in the original model, permit us to deal with non-zero radial and vertical matter fluxes, and the solution we construct for the global equilibrium system provides a full description of the radial and vertical dependence within the plasma disk. The main issue of our analysis is outlining a modulation of the matter distribution in the disk which corresponds to the formation of a ring-like sequence, here associated with a corresponding radial oscillation of the matter flux.

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