arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1104.3620astro-ph.SR
收藏

日冕Shock Waves、EUV波及其与日冕物质抛射的关系II。用非线性几何声学模拟MHD Shock Wave沿太阳表面的传播

Coronal Shock Waves, EUV waves, and their Relation to CMEs. II. Modeling MHD Shock Wave Propagation Along the Solar Surface, Using Nonlinear Geometrical Acoustics

A. N. Afanasyev, A. M. Uralov

摘要:

我们用非线性几何声学模拟了日冕冲击波的传播。该方法是基于Wentzel-Kramers-Brillouin(WKB)的方法,并考虑到非线性波的主要属性:i)波前速度的波动振幅的依赖性,ii)非线性耗散的波能量,和iii)孤立冲击波的持续时间的逐步增加。我们详细讨论的方法和目前的冲击相关的极紫外(EUV)波的传播建模的结果,以及Moreton波沿太阳表面在最简单的日冕模型。计算结果显示了波浪的减速和拉长。相比之下,在线性近似中考虑的波保持其长度不变,并略有加速。

英文摘要:

We model the propagation of a coronal shock wave, using nonlinear geometrical acoustics. The method is based on the Wentzel-Kramers-Brillouin (WKB) approach and takes into account the main properties of nonlinear waves: i) dependence of the wave front velocity on the wave amplitude, ii) nonlinear dissipation of the wave energy, and iii) progressive increase in the duration of solitary shock waves. We address the method in detail and present results of the modeling of the propagation of shock-associated extreme-ultraviolet (EUV) waves as well as Moreton waves along the solar surface in the simplest solar corona model. The calculations reveal deceleration and lengthening of the waves. In contrast, waves considered in the linear approximation keep their length unchanged and slightly accelerate.

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。

↑