1997年5月12日Cme事件：I.爆发前磁结构的简化模型
May 12 1997 Cme Event: I. a Simplified Model of the Pre-Eruptive Magnetic Structure
摘要：
建立了1997年5月12日CME爆发前日冕磁场的一个简单模型。首先，磁场是通过叠加一个大规模的背景场和一个局部的双极场来构建的，以模拟在无电流近似下的有源区（AR）。其次，这种潜在的配置是准静态剪切光球涡运动施加到两个通量浓度的AR。第三，所产生的无力场，然后通过取消光球磁通量的帮助下，一个适当的切向电场施加到AR的中心部分。为了理解建模配置的结构，我们使用场线映射技术，通过将其推广到球面几何。结果表明，初始势位形包含一个双曲通量管（HFT），它是两个相交的准分界线层的结合。该HFT提供了AR和全球太阳磁场之间的闭合磁通量的分区。应用于AR的涡旋运动使日冕体积中的场线互锁，以形成另外两个新的HFT，它们被夹在薄的电流层中。这些电流层中的重新连接有助于在磁通量抵消阶段中重新分配AR内的磁通量和电流。在该阶段中，形成磁通量绳以及围绕该绳缠绕的秃斑分界面。其他重要的影响所确定的结构特征的建模配置进行了讨论。
英文摘要：
A simple model of the coronal magnetic field prior to the CME eruption on May 12 1997 is developed. First, the magnetic field is constructed by superimposing a large-scale background field and a localized bipolar field to model the active region (AR) in the current-free approximation. Second, this potential configuration is quasi-statically sheared by photospheric vortex motions applied to two flux concentrations of the AR. Third, the resulting force-free field is then evolved by canceling the photospheric magnetic flux with the help of an appropriate tangential electric field applied to the central part of the AR. To understand the structure of the modeled configuration, we use the field line mapping technique by generalizing it to spherical geometry. It is demonstrated that the initial potential configuration contains a hyperbolic flux tube (HFT) which is a union of two intersecting quasi-separatrix layers. This HFT provides a partition of the closed magnetic flux between the AR and the global solar magnetic field. The vortex motions applied to the AR interlock the field lines in the coronal volume to form additionally two new HFTs pinched into thin current layers. Reconnection in these current layers helps to redistribute the magnetic flux and current within the AR in the flux-cancellation phase. In this phase, a magnetic flux rope is formed together with a bald patch separatrix surface wrapping around the rope. Other important implications of the identified structural features of the modeled configuration are also discussed.
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。
