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arXiv 2008.03146astro-ph.SR
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通过磁震学绘制日冕磁场

Mapping the magnetic field in the solar corona through magnetoseismology

Zihao Yang, Hui Tian, Steven Tomczyk, Richard Morton, Xianyong Bai, Tanmoy Samanta, Yajie Chen

摘要:

磁震学是一种基于磁流体力学(MHD)波观测的磁场诊断技术,已被广泛用于估算日冕振荡结构的场强。然而,以前的磁震学主要应用于偶尔发生的振荡事件,仅提供沿振荡结构的平均场强或场强的一维分布的估计。如果我们将磁震学应用于日冕多道偏振仪(CoMP)发现的普遍传播的横向MHD波,则可以消除这种限制。使用几个CoMP观测的Fe xiii 1074.7 nm和1079.8 nm谱线,我们得到了地图的等离子体密度和波相速度的日冕,这使我们能够映射的强度和方向的日冕磁场在天空的平面。我们还研究了电子密度和磁场强度的分布,并比较了它们在平静太阳和活动区随高度的变化。这种测量可以提供关键信息,以促进我们对太阳磁性和整个太阳大气层的磁耦合的理解。

英文摘要:

Magnetoseismology, a technique of magnetic field diagnostics based on observations of magnetohydrodynamic (MHD) waves, has been widely used to estimate the field strengths of oscillating structures in the solar corona. However, previously magnetoseismology was mostly applied to occasionally occurring oscillation events, providing an estimate of only the average field strength or one-dimensional distribution of field strength along an oscillating structure. This restriction could be eliminated if we apply magnetoseismology to the pervasive propagating transverse MHD waves discovered with the Coronal Multi-channel Polarimeter (CoMP). Using several CoMP observations of the Fe xiii 1074.7 nm and 1079.8 nm spectral lines, we obtained maps of the plasma density and wave phase speed in the corona, which allow us to map both the strength and direction of the coronal magnetic field in the plane of sky. We also examined distributions of the electron density and magnetic field strength, and compared their variations with height in the quiet Sun and active regions. Such measurements could provide critical information to advance our understanding of the Sun's magnetism and the magnetic coupling of the whole solar atmosphere.

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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