arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.00177astro-ph.SR
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不同初始条件下耀斑活动区三维磁场结构的外推

Extrapolation of Three-dimensional Magnetic Field Structure in Flare-productive Active Regions with Different Initial Conditions

Y. Kawabata, S. Inoue, T. Shimizu

摘要:

非线性无力场(NLFFF)模型已被广泛用作推断三维(3D)磁场结构的工具。在这项研究中,NLFFF计算相对于3D磁场的初始猜测的依赖性进行了研究。虽然以前的研究的大部分使用势场作为NLFFF建模的初始猜测,我们采用不同的恒定无力α的线性无力场作为初始猜测。这种方法使我们能够调查如何独特的磁场得到的NLFFF外推相对于初始猜测。在强磁场区,NLFFF外推对初始条件的依赖性较小。因此,尽管洛伦兹力集中在较低高度处,但较低高度处的磁场($< 10$ Mm)往往受初始条件的影响较小(不同初始条件下的相关系数C>0.9)。

英文摘要:

The nonlinear force-free field (NLFFF) modeling has been extensively used as a tool to infer three-dimensional (3D) magnetic field structure. In this study, the dependency of the NLFFF calculation with respect to the initial guess of the 3D magnetic field is investigated. While major part of the previous studies used potential field as the initial guess in the NLFFF modeling, we adopt the linear force-free fields with different constant force-free alpha as the initial guesses. This method enables us to investigate how unique the magnetic field obtained by the NLFFF extrapolation with respect to the initial guess is. The dependence of the initial condition of the NLFFF extrapolation is smaller in the strong magnetic field region. Therefore, the magnetic field at the lower height ($< 10$ Mm) tends to be less affected by the initial condition (correlation coefficient C>0.9 with different initial condition), although the Lorentz force is concentrated at the lower height.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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