COEXISTING FLUX ROPE AND DIPPED ARCADE SECTIONS ALONG ONE SOLAR FILAMENT
COEXISTING FLUX ROPE AND DIPPED ARCADE SECTIONS ALONG ONE SOLAR FILAMENT
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DOI：
10.1088/0004-637x/714/1/343
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
Yang Guo;Yang Guo;B. Schmieder;P. Démoulin;T. Wiegelmann;G. Aulanier;Tibor Török;V. Bommier
中科院分区：
文献类型：
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作者：
Yang Guo;Yang Guo;B. Schmieder;P. Démoulin;T. Wiegelmann;G. Aulanier;Tibor Török;V. Bommier
我们计算活性区域的三维磁场，以研究活性区域细丝的磁性配置。采用非线性无力场模型来计算光球层上方的磁场，THEMIS/MTR于2005年5月27日观测到了光球层上的矢量磁场。我们提出了一种新的方法来消除横向场的180°模糊性。接下来，我们通过最小化观察到的矢量场中的总力和扭矩来分析数据预处理的含义。此步骤为非线性无力场模型提供一致的底部边界条件。然后，使用优化方法计算日冕场，我们找到沿着极性反转线的磁通绳。磁通绳与 Hα 细丝的一部分很好地对齐，而磁倾角的总分布与整个 Hα 细丝一致。这意味着灯丝的一个部分的磁场结构是磁通绳，而另一部分是剪切拱廊。拱廊在负螺旋性磁场中感应出左轴承细丝，这与磁通绳在相同螺旋性磁场中感应出的倒刺手性相反。磁绳中心的场强约为 700 G，磁力线的扭转约为 1.4 圈。
We compute the three-dimensional magnetic field of an active region in order to study the magnetic configuration of active region filaments. The nonlinear force-free field model is adopted to compute the magnetic field above the photosphere, where the vector magnetic field was observed by THEMIS/MTR on 2005 May 27. We propose a new method to remove the 180° ambiguity of the transverse field. Next, we analyze the implications of the preprocessing of the data by minimizing the total force and torque in the observed vector fields. This step provides a consistent bottom boundary condition for the nonlinear force-free field model. Then, using the optimization method to compute the coronal field, we find a magnetic flux rope along the polarity inversion line. The magnetic flux rope aligns well with part of an Hα filament, while the total distribution of the magnetic dips coincides with the whole Hα filament. This implies that the magnetic field structure in one section of the filament is a flux rope, while the other is a sheared arcade. The arcade induced a left-bearing filament in the magnetic field of negative helicity, which is opposite to the chirality of barbs that a flux rope would induce in a magnetic field of the same helicity sign. The field strength in the center of the flux rope is about 700 G, and the twist of the field lines is ∼1.4 turns.