论文标题
基于非线性无力建模的太阳活性区域12673中非电位磁场的演变
Evolution of the Non-potential Magnetic Field in the Solar Active Region 12673 Based on a Nonlinear Force-free Modeling
论文作者
论文摘要
活性区域（AR）12673产生了许多M级和几个X级耀斑，其中一种是X9.3耀斑，记录为太阳能周期中最大的太阳能耀斑24中。我们使用AR 12673中的三维耀斑生产性磁场的演变，使用AR 12673中的三维耀斑生产性磁场，使用了每次非线性field field field field field field field field field field of field field ietabiation 00，00 9月4日。 UT。我们的分析发现，在9月4日之前形成了三个磁通绳（MFR），其中一条在9月6日产生了X9.3耀斑。一个MFR具有正磁扭转，这与其他两个MFR不同。由于MFR积累正扭曲的磁通量的时间演变与9月4日至6日的GOOS X射线通量的轮廓一致，因此我们建议具有正扭曲的MFR的形成与M级火力的发生密切相关，包括M5.5耀斑，包括M5.5耀斑。我们进一步在MFRS周围的磁场中发现了一个磁性零，在M5.5耀斑之前具有正扭曲，这是此期间观察到的最大的M型闪光。通过与AIA 1600 Angstrom图像进行比较，我们发现上覆的田线线的脚步固定在最初观察到亮度的区域。因此，我们建议，由null处正面扭曲的MFR的圆环不稳定性引起的重新连接可能会驾驶M5.5耀斑。
Active region (AR) 12673 produced many M-class and several X-class flares, one of which being an X9.3 flare, which is recorded as the largest solar flare in solar cycle 24. We studied the evolution of the three-dimensional flare-productive magnetic field within AR 12673, using a time series of nonlinear force-free field extrapolations of every 12 hours from September 4th 00:00 UT to 6th 00:00 UT. Our analysis found that three magnetic flux ropes (MFRs) are formed by September 4th, one of which produced the X9.3 flare on September 6th. One MFR has positive magnetic twist which is a different sign from other two MFRs. Since the temporal evolution of the magnetic flux of the MFR accumulating the positive twist is consistent with the profile of the GOES X-ray flux well observed from September 4th to 6th, we suggest that the formation of the MFR having the positive twist is closely related to the occurrence of the M-class flares including an M5.5 flare. We further found a magnetic null in the magnetic field surrounding the MFRs, in particular, above the MFR having positive twist before the M5.5 flare which is the largest M-flare observed during this period. By comparing with the AIA 1600 angstrom images, we found that the footpoints of the overlying field lines are anchored to the area where the brightening was initially observed. Therefore, we suggest that reconnection induced by the torus instability of the positively twisted MFR at the null possibly drived the M5.5 flare.
