arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.12420astro-ph.SRphysics.plasm-ph
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利用数值模拟寻找太阳孔隙中波能通量阻尼的机制

Finding the mechanism of wave energy flux damping in solar pores using numerical simulations

Julia M. Riedl, Caitlin A. Gilchrist-Millar, Tom Van Doorsselaere, David B. Jess, Samuel D. T. Grant

摘要:

上下文太阳磁孔,由于其集中的磁场,磁声波的合适的指南。最近的观测表明,在孔隙中传播的能量通量受到强烈的阻尼与高度,然而,原因还不清楚。目的。我们调查可能的阻尼机制数值解释的意见。方法.我们进行了二维数值磁流体动力学(MHD)模拟,从一个单一的孔隙的平衡模型的启发所观察到的属性。能量通过不同的垂直驱动器以30s的周期插入到畴的底部。模拟进行了理想的MHD和非理想的效果。结果虽然分析的理想和非理想的MHD模拟与平面驱动器的能量通量不能再现所观察到的阻尼,数值预测的阻尼本地化的驱动器密切对应的观察。局部驱动器模拟中的强阻尼是由两种几何效应引起的,即由于发散的场线引起的几何扩散和横向波泄漏。

英文摘要:

Context. Solar magnetic pores are, due to their concentrated magnetic fields, suitable guides for magnetoacoustic waves. Recent observations have shown that propagating energy flux in pores is subject to strong damping with height; however, the reason is still unclear. Aims. We investigate possible damping mechanisms numerically to explain the observations. Methods. We performed 2D numerical magnetohydrodynamic (MHD) simulations, starting from an equilibrium model of a single pore inspired by the observed properties. Energy was inserted into the bottom of the domain via different vertical drivers with a period of 30s. Simulations were performed with both ideal MHD and non-ideal effects. Results. While the analysis of the energy flux for ideal and non-ideal MHD simulations with a plane driver cannot reproduce the observed damping, the numerically predicted damping for a localized driver closely corresponds with the observations. The strong damping in simulations with localized driver was caused by two geometric effects, geometric spreading due to diverging field lines and lateral wave leakage.

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。

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