Statistical Study of the Magnetic Field Orientation in Solar Filaments
Statistical Study of the Magnetic Field Orientation in Solar Filaments
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DOI：
10.3847/1538-4357/aa9cf1
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
Y. Hanaoka;T. Sakurai
中科院分区：
文献类型：
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作者：
Y. Hanaoka;T. Sakurai
我们已经进行了统计研究的平均取向的磁场在太阳灯丝相对于其轴的400多个样本，根据每日全太阳，全斯托克斯分光偏振观测使用的He i 1083.0 nm线的数据。样品的主要部分是安静区的灯丝，但也包括活跃区的灯丝。磁丝中磁场的平均取向表现出一种系统性的性质，取决于半球;在北方（南）半球的磁丝中，磁场的方向大多顺时针（逆时针）偏离它们的轴，这些轴沿着磁极反转线。磁场偏离轴的角度集中在10°和30°之间。这种半球模式与暗条倒钩、暗条通道和其他具有手征的太阳特征所揭示的手征是一致的。对于某些细丝，证实了它们的磁场方向局部平行于Hα图像中看到的结构。我们的研究结果首次证实了这种半球模式与直接观察磁场的细丝。有趣的是，显示出与半球图案相反的磁场偏离的细丝在许多情况下被发现在极性反转线上方，其周围光球磁场具有与遵循海尔-尼科尔森定律的活动区域相反的极性排列。
We have carried out a statistical study of the average orientation of the magnetic field in solar filaments with respect to their axes for more than 400 samples, based on data taken with daily full-Sun, full-Stokes spectropolarimetric observations using the He i 1083.0 nm line. The major part of the samples are the filaments in the quiet areas, but those in the active areas are included as well. The average orientation of the magnetic field in filaments shows a systematic property depending on the hemisphere; the direction of the magnetic field in filaments in the northern (southern) hemisphere mostly deviates clockwise (counterclockwise) from their axes, which run along the magnetic polarity inversion line. The deviation angles of the magnetic field from the axes are concentrated between 10° and 30°. This hemispheric pattern is consistent with that revealed for chirality of filament barbs, filament channels, and for other solar features found to possess chirality. For some filaments, it was confirmed that their magnetic field direction is locally parallel to their structure seen in Hα images. Our results for the first time confirmed this hemispheric pattern with the direct observation of the magnetic field in filaments. Interestingly, the filaments which show the opposite magnetic field deviation to the hemispheric pattern, are in many cases found above the polarity inversion line whose ambient photospheric magnetic field has the polarity alignment being opposite to that of active regions following the Hale–Nicholson law.