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arXiv 1701.01458astro-ph.SR
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SUNRISE/IMaX的静磁模拟:应用于用SUNRISE II观测的活动区

Magneto-static modelling from SUNRISE/IMaX: Application to an active region observed with SUNRISE II

T. Wiegelmann, T. Neukirch, D. H. Nickeler, S. K. Solanki, P. Barthol, A. Gandorfer, L. Gizon, J. Hirzberger, T. L. Riethmüller, M. van Noort, J. Blanco Rodrígu… 展开作者

T. Wiegelmann, T. Neukirch, D. H. Nickeler, S. K. Solanki, P. Barthol, A. Gandorfer, L. Gizon, J. Hirzberger, T. L. Riethmüller, M. van Noort, J. Blanco Rodríguez, J. C. Del Toro Iniesta, D. Orozco Suárez, W. Schmidt, V. Martínez Pillet, M. Knölker

摘要:

静磁模型可以克服无力磁场外推所面临的一些问题。到目前为止,它们的使用有限,并且在应用于安静的Sun数据时遇到了问题。在这里,我们提出了对活动区域的第一应用。2013年6月,\sunrise{}球载太阳观测站利用IMaX偏振仪采集的太阳矢量磁场数据,作为活动区上方太阳大气层静磁模型的边界条件。IMaX数据嵌入到SDO/HMI观测的活动区矢量磁图中。这项工作继续我们的静磁外推方法,它已被应用于较早的({ \it论文I}),以一个安静的太阳区域观察与\sunrise{} I。在一个活跃的区域中,在测量的斯托克斯参数的信号噪声比是相当高的比在安静的太阳,因此,水平光球磁场的IMaX测量允许我们指定的自由参数的模型在一个特殊的类的线性静磁平衡。IMAX的高空间分辨率(110-130公里,像素大小40公里)使我们能够通过大约50个网格点垂直模拟光球层和中色球层之间的非无力层。在我们的方法中,我们可以结合光球和色球的混合β层的某些方面,例如,考虑到有限的洛伦兹力,这在过去用较低分辨率的光球测量是不可能的。然而,线性模型不允许对像强局部化电流这样的固有非线性结构进行建模。

英文摘要:

Magneto-static models may overcome some of the issues facing force-free magnetic field extrapolations. So far they have seen limited use and have faced problems when applied to quiet-Sun data. Here we present a first application to an active region. We use solar vector magnetic field measurements gathered by the IMaX polarimeter during the flight of the \sunrise{} balloon-borne solar observatory in June 2013 as boundary condition for a magneto-static model of the higher solar atmosphere above an active region. The IMaX data are embedded in active region vector magnetograms observed with SDO/HMI. This work continues our magneto-static extrapolation approach, which has been applied earlier ({\it Paper I}) to a quiet Sun region observed with \sunrise{} I. In an active region the signal-to-noise-ratio in the measured Stokes parameters is considerably higher than in the quiet Sun and consequently the IMaX measurements of the horizontal photospheric magnetic field allow us to specify the free parameters of the model in a special class of linear magneto-static equilibria. The high spatial resolution of IMaX (110-130 km, pixel size 40 km) enables us to model the non-force-free layer between the photosphere and the mid chromosphere vertically by about 50 grid points. In our approach we can incorporate some aspects of the mixed beta layer of photosphere and chromosphere, e.g., taking a finite Lorentz force into account, which was not possible with lower resolution photospheric measurements in the past. The linear model does not, however, permit to model intrinsic nonlinear structures like strongly localized electric currents.

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