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首页> 外文期刊>The Astrophysical Journal. Letters >NONLINEAR FORCE-FREE FIELD EXTRAPOLATION OF A CORONAL MAGNETIC FLUX ROPE SUPPORTING A LARGE-SCALE SOLAR FILAMENT FROM A PHOTOSPHERIC VECTOR MAGNETOGRAM
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NONLINEAR FORCE-FREE FIELD EXTRAPOLATION OF A CORONAL MAGNETIC FLUX ROPE SUPPORTING A LARGE-SCALE SOLAR FILAMENT FROM A PHOTOSPHERIC VECTOR MAGNETOGRAM

机译：冠状磁通量的非线性无力场外推法，由光球矢量磁像支撑大型太阳能丝

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摘要

Solar filaments are commonly thought to be supported inmagnetic dips, in particular, in those ofmagnetic flux ropes (FRs). In this Letter, based on the observed photospheric vector magnetogram, we implement a nonlinear force-free field (NLFFF) extrapolation of a coronal magnetic FR that supports a large-scale intermediate filament between an active region and a weak polarity region. This result is a first, in the sense that current NLFFF extrapolations including the presence of FRs are limited to relatively small-scale filaments that are close to sunspots and along main polarity inversion lines (PILs) with strong transverse field and magnetic shear, and the existence of an FR is usually predictable. In contrast, the present filament lies along the weak-field region (photospheric field strength ≤100 G), where the PIL is very fragmented due to small parasitic polarities on both sides of the PIL and the transverse field has a low signal-to-noise ratio. Thus, extrapolating a large-scale FR in such a case represents a far more difficult challenge. We demonstrate that our CESE-MHD-NLFFF code is sufficient for the challenge. The numerically reproduced magnetic dips of the extrapolated FR match observations of the filament and its barbs very well, which strongly supports the FR-dip model for filaments. The filament is stably sustained because the FR is weakly twisted and strongly confined by the overlying closed arcades.
机译：通常认为，日光灯丝被支撑在非磁性浸没中，特别是在磁通量绳索（FR）中。在这封信中，基于观测到的光球矢量磁图，我们实现了对日冕磁性FR的非线性无力场（NLFFF）外推，该FR支持活动区域和弱极性区域之间的大规模中间灯丝。从某种意义上说，这一结果是第一个结果，即当前的NLFFF外推法（包括FR的存在）仅限于相对较小规模的细丝，这些细丝靠近黑子且沿具有强横向场和磁剪切力的主极性反转线（PIL）以及FR的存在通常是可以预测的。相比之下，目前的灯丝沿着弱场区域（光球场强度≤100G）分布，在该区域中，由于PIL两侧的寄生极性较小，PIL非常破碎，并且横向场的信噪比较低噪声比。因此，在这种情况下外推大规模FR代表了更加困难的挑战。我们证明了我们的CESE-MHD-NLFFF代码足以应对挑战。外推FR的数字重现磁倾角与灯丝及其倒钩的观察值非常匹配，这强烈支持了灯丝的FR-dip模型。长丝稳定地保持着，因为阻燃性纤维被上覆的封闭拱廊微弱地扭曲和强烈限制。

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