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arXiv 1407.2295astro-ph.SR
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磁涡流管驱动的小尺度等离子体爆发的光谱偏振特性

Spectro-Polarimetric Properties of Small-Scale Plasma Eruptions Driven by Magnetic Vortex Tubes

Irina N. Kitiashvili

摘要:

太阳对流的高度湍流性质导致了次表层与光球层和色球层之间强烈的多尺度相互作用。根据真实的三维辐射MHD数值模拟无处不在的小尺度涡管产生的湍流下可见的表面和集中在颗粒间的车道。涡管可以捕获和放大磁场,穿透色球层,并引发准周期性的流动爆发,产生Alfvénic波,将质量和能量输送到太阳大气中。模拟揭示了高速流动模式,复杂的热力学和磁结构的爆发涡流管。近地层强烈的压力梯度是自发喷发的启动和驱动力,而低色球层的洛伦兹力则加速了自发喷发。在本文中,模拟数据被用来进一步调查的喷发,其光谱偏振特性的Fe I 6301.5和6302.5 A谱线的动力学,并展示预期的签名的喷发日出SP数据。我们发现,复杂的动力学结构的涡管(在涡核和周边的上升流下降)可以捕捉到的斯托克斯I型。在喷发过程中,下降流和上升流的比例会突然改变,这种效应可以在斯托克斯V剖面中观察到。此外,在喷发期间,线偏振信号增加,这也可以用Hinode SP检测到。

英文摘要:

Highly turbulent nature of convection on the Sun causes strong multi-scale interaction of subsurface layers with the photosphere and chromosphere. According to realistic 3D radiative MHD numerical simulations ubiquitous small-scale vortex tubes are generated by turbulent flows below the visible surface and concentrated in the intergranular lanes. The vortex tubes can capture and amplify magnetic field, penetrate into chromospheric layers and initiate quasi-periodic flow eruptions that generates Alfvénic waves, transport mass and energy into the solar atmosphere. The simulations revealed high-speed flow patterns, and complicated thermodynamic and magnetic structures in the erupting vortex tubes. The spontaneous eruptions are initiated and driven by strong pressure gradients in the near-surface layers, and accelerated by the Lorentz force in the low chromosphere. In this paper, the simulation data are used to further investigate the dynamics of the eruptions, their spectro-polarimetric characteristics for the Fe I 6301.5 and 6302.5 A spectral lines, and demonstrate expected signatures of the eruptions in the Hinode SP data. We found that the complex dynamical structure of vortex tubes (downflows in the vortex core and upflows on periphery) can be captured by the Stokes I profiles. During an eruption, the ratio of down and upflows can suddenly change, and this effect can be observed in the Stokes V profile. Also, during the eruption the linear polarization signal increases, and this also can be detected with Hinode SP.

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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