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arXiv 1202.4562astro-ph.SR
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Si I 1082.7 nm和He I 1083.0 nm有源区灯丝的全Stokes分析

Magnetic fields of an active region filament from full Stokes analysis of Si I 1082.7 nm and He I 1083.0 nm

Z. Xu, A. Lagg, S. Solanki, Y. Liu

摘要:

利用德国真空塔望远镜(VTT)的特内里费红外偏振仪(TIP II)的分光偏振观测资料,获得了光球层和上色球层活动区暗条的矢量磁场。我们应用Milne-Eddington反演的全斯托克斯矢量的光球Si I 1082.7 nm和上色球He I三重态在1083.0 nm获得磁场矢量和速度图在两个大气层。我们发现:(1)在TIP II数据采集开始时,H $α$中已经存在完整的细丝。只有一个部分形成的,由多个小线程组成的,在河一。(2)AR细丝包括两个部分。其中一个显示出很强的磁场强度,在上色球层约为600 - 800 G,在光球层约为800 - 1000 G。另一个在两个层中仅表现出相对较弱的磁场强度。(3)斯托克斯V信号指示接近色球PIL的磁场强度的下降。(3)在色球层一致的上升流沿PIL两侧的下降流。(4)横向磁场在光球层中几乎平行于PIL,在色球层中倾斜20 - 30度。(5)发现暗条周围色球磁场处于正常位形,而光球场呈现凹磁拓扑。这些观测结果与磁通绳的出现以及随后的灯丝形成是一致的。

英文摘要:

Vector magnetic fields of an active region filament in the photosphere and upper chromosphere are obtained from spectro-polarimetric observations recorded with the Tenerife Infrared Polarimeter (TIP II) at the German Vacuum Tower Telescope (VTT). We apply Milne-Eddington inversions on full Stokes vectors of the photospheric Si I 1082.7 nm and the upper chromospheric He I triplet at 1083.0 nm to obtain magnetic field vector and velocity maps in two atmosphere layers. We find that: (1)A complete filament was already present in H$α$ at the beginning of the TIP II data acquisition. Only a partially formed one, composed of multiple small threads, was present in He I. (2) The AR filament comprises two sections. One shows strong magnetic field intensities, about 600 - 800 G in the upper chromosphere and 800 - 1000 G in the photosphere. The other exhibits only comparatively weak magnetic field strengths in both layers. (3) The Stokes V signal is indicative of a dip in the magnetic field strength close to the chromospheric PIL. (3) In the chromosphere consistent upflows are found along the PIL flanked by downflows. (4) The transversal magnetic field is nearly parallel to the PIL in the photosphere and inclined by 20 - 30 degree in the chromosphere. (5) The chromospheric magnetic field around the filament is found to be in normal configuration, while the photospheric field presents a concave magnetic topology. The observations are consistent with the emergence of a flux rope with a subsequent formation of a filament.

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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