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arXiv 0908.3950astro-ph.SR
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光球分形结构与日冕磁场的相关性

The correlation of fractal structures in the photospheric and the coronal magnetic field

M. Dimitropoulou, M. Georgoulis, H. Isliker, L. Vlahos, A. Anastasiadis, D. Strintzi, X. Moussas

摘要:

本文研究了太阳活动区光球磁场和日冕磁场的分形性质之间的关系,结果表明,当采用非线性无力外推时,观测到的光球二维结构的分形维数与外推的日冕不稳定体积之间没有相关性。这一结果与(1)使光球磁场更接近非线性无力平衡和(2)忽略几乎完全由不稳定体积填充的模型磁场体积的下部的努力无关。光球和日冕磁特征的分形维数之间的显着相关性,只观察到在零水平(下限)的近似无电流(潜在的)磁场外推。我们的结论是,复杂的过渡从光球非无力领域的日冕无力的阻碍任何直接的相关性之间的分形维数的2d光球图案和它们的3d对应的日冕在非线性无力的限制。

英文摘要:

This work examines the relation between the fractal properties of the photospheric magnetic patterns and those of the coronal magnetic fields in solar active regions.Our results show no correlation between the fractal dimensions of the observed 2d photospheric structures and the extrapolated unstable volumes in the corona, when nonlinear force-free extrapolation is used. This result is independent of efforts to (1) bring the photospheric magnetic fields closer to a nonlinear force-free equilibrium and (2) omit the lower part of the modeled magnetic field volume that is almost completely filled by unstable volumes. A significant correlation between the fractal dimensions of the photospheric and coronal magnetic features is only observed at the zero level (lower limit) of approximation of a current-free (potential) magnetic field extrapolation. We conclude that the complicated transition from photospheric non-force-free fields to coronal force-free ones hampers any direct correlation between the fractal dimensions of the 2d photospheric patterns and their 3d counterparts in the corona at the nonlinear force-free limit.

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