论文标题
重建高度扭转的磁场
Reconstructing Highly-twisted Magnetic Fields
论文作者
论文摘要
我们研究了非线力代码使用Titov andDémoulin（1999）作为测试用例来计算高度扭转磁场构型的能力。该代码在下边界的磁场正常分量上使用边界条件计算无力场，以及下边界在一个磁场的一个极性上的当前密度的正常分量。该代码还可以将电流密度用于下部边界的两个磁场上的两个极性作为边界条件。我们通过增加模型中的次面线电流来实现，研究了重建的重建的准确性。我们发现，该代码可以大致重建titov-démoulin字段，以达到$ n _ {\ textrm {t}}} \约8.8 $的表面扭曲数字。这包括带有秃头补丁的配置。我们研究了恢复秃头斑块的能力，并更普遍地确定了我们方法对高度扭转领域的局限性。结果对我们从观察数据重建冠状磁场的能力具有影响。
We investigate the ability of a nonlinear force-free code to calculate highly-twisted magnetic field configurations using the Titov and Démoulin (1999) equilibrium field as a test case. The code calculates a force-free field using boundary conditions on the normal component of the field in the lower boundary, and the normal component of the current density over one polarity of the field in the lower boundary. The code can also use the current density over both polarities of the field in the lower boundary as a boundary condition. We investigate the accuracy of the reconstructions with increasing flux-rope surface twist number $N_{\textrm{t}}$, achieved by decreasing the sub-surface line current in the model. We find that the code can approximately reconstruct the Titov-Démoulin field for surface twist numbers up to $N_{\textrm{t}} \approx 8.8$. This includes configurations with bald patches. We investigate the ability to recover bald patches, and more generally identify the limitations of our method for highly-twisted fields. The results have implications for our ability to reconstruct coronal magnetic fields from observational data.
