COMPARISON OF FORCE-FREE CORONAL MAGNETIC FIELD MODELING USING VECTOR FIELDS FROM HINODE AND SOLAR DYNAMICS OBSERVATORY
COMPARISON OF FORCE-FREE CORONAL MAGNETIC FIELD MODELING USING VECTOR FIELDS FROM HINODE AND SOLAR DYNAMICS OBSERVATORY
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DOI：
10.1088/0004-637x/769/1/59
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
J. Thalmann;S. Tiwari;T. Wiegelmann
中科院分区：
文献类型：
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作者：
J. Thalmann;S. Tiwari;T. Wiegelmann
用两种不同仪器的光球磁矢量图模拟活动区上方的非线性无力日冕磁场。我们使用矢量地图推断出的偏振测量的太阳动力学天文台/日震和磁成像仪（HMI）和太阳光学望远镜的分光偏振仪（SP）板日之出。除了基于HMI数据的模型计算外，我们还使用原始分辨率的SP数据和缩小到HMI分辨率的SP数据。这使我们能够比较基于不同仪器数据的模型结果，并研究高分辨率数据的合并如何影响模型结果。所得到的三维磁场的磁能含量和磁拓扑方面进行了比较。我们发现更强的磁场中的SP数据，转化为更高的总磁能的SP模型。HMI和SP下边界的净洛伦兹力验证了它们的无力兼容性。我们发现磁场能量的绝对估计值存在很大差异，但相对估计值相似，例如，不同区域共享的多余能量和通量的比例。相邻连接域的位置和延伸不同，SP模型场倾向于更高和更垂直。因此，基于无力场模型的磁连通性的结论应谨慎。我们发现，当基于较低分辨率的SP数据的模型解决方案的偏差是小的解决方案的差异相比，基于不同的仪器的数据。
Photospheric magnetic vector maps from two different instruments are used to model the nonlinear force-free coronal magnetic field above an active region. We use vector maps inferred from polarization measurements of the Solar Dynamics Observatory/Helioseismic and Magnetic Imager (HMI) and the Solar Optical Telescope's Spectropolarimeter (SP) on board Hinode. Besides basing our model calculations on HMI data, we use both SP data of original resolution and scaled down to the resolution of HMI. This allows us to compare the model results based on data from different instruments and to investigate how a binning of high-resolution data affects the model outcome. The resulting three-dimensional magnetic fields are compared in terms of magnetic energy content and magnetic topology. We find stronger magnetic fields in the SP data, translating into a higher total magnetic energy of the SP models. The net Lorentz forces of the HMI and SP lower boundaries verify their force-free compatibility. We find substantial differences in the absolute estimates of the magnetic field energy but similar relative estimates, e.g., the fraction of excess energy and of the flux shared by distinct areas. The location and extension of neighboring connectivity domains differ and the SP model fields tend to be higher and more vertical. Hence, conclusions about the magnetic connectivity based on force-free field models are to be drawn with caution. We find that the deviations of the model solution when based on the lower-resolution SP data are small compared to the differences of the solutions based on data from different instruments.