论文标题
揭示色球涡流的磁性
Unveiling the magnetic nature of chromospheric vortices
论文作者
论文摘要
据信太阳染色体中的涡流结构可以在太阳大气的不同层之间引导能量。我们研究了染色层中两个小规模静sun旋转结构的性质和动力学。我们分析了两种色球结构，它们在CA II 8542Å〜线上使用干涉二维光谱仪（IBIS）进行的光谱观测中显示了清晰的旋转模式。我们介绍了表现出色相球中旋转结构的磁性的光谱信号的检测。我们的观察结果显示了两个长期寿命的等离子体结构，每个等离子体都会顺时针旋转10 arcsec $^{2} $〜安静的阳性区域。它们的圆极化信号高于噪声水平5-10倍。观测值的视线多普勒速度和水平速度图揭示了两个结构和周围周围清晰的等离子体流动。 MHD模拟显示，这两个结构在磁性上有可能。波浪分析表明，观察到的旋转涡流模式可能是由于磁磁声模式的实际旋转缓慢和更快的方位角相位速度模式的组合。我们的结果表明，在太阳染色体中观察到的涡流结构本质上是磁性的，可以通过染色体局部连接。
Vortex structures in the Sun's chromosphere are believed to channel energy between different layers of the solar atmosphere. We investigate the nature and dynamics of two small-scale quiet-Sun rotating structures in the chromosphere. We analyse two chromospheric structures that show clear rotational patterns in spectropolarimetric observations taken with the Interferometric Bidimensional Spectrometer (IBIS) at the Ca II 8542 Å~ line. We present the detection of spectropolarimetric signals that manifest the magnetic nature of rotating structures in the chromosphere. Our observations show two long-lived structures of plasma that each rotate clockwise inside a 10 arcsec$^{2}$~ quiet-Sun region. Their circular polarization signals are 5-10 times above the noise level. Line-of-sight Doppler velocity and horizontal velocity maps from the observations reveal clear plasma flows at and around the two structures. An MHD simulation shows these two structures are plausibly magnetically connected. Wave analysis suggests that the observed rotational vortex pattern could be due to a combination of slow actual rotation and a faster azimuthal phase speed pattern of a magneto-acoustic mode. Our results imply that the vortex structures observed in the Sun's chromosphere are magnetic in nature and that they can be connected locally through the chromosphere.
