• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >RESOLUTION OF THE 180° AMBIGUITY FOR INVERSE HORIZONTAL MAGNETIC FIELD CONFIGURATIONS
【24h】

RESOLUTION OF THE 180° AMBIGUITY FOR INVERSE HORIZONTAL MAGNETIC FIELD CONFIGURATIONS

机译：反向水平磁场配置的180°歧义解析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A well-known problem in solar physics is that solutions for the transverse magnetic field direction are ambiguous with respect to a 180° reversal in the field direction. In this paper we focus on three methods for the removal of the 180° ambiguity applied to three MHD models. These methods are (1) the reference field method, (2) the method of magnetic pressure gradient, and (3) the magnetic field divergence-free method. All three methods are noniterative, and methods 2 and 3 are analytical and fast. We apply these methods to three MHD equilibrium model fields: (1) an analytical solution of a nonlinear force-free magnetic field equilibrium from Low, (2) a simulation of an emerging twisted flux tube from Fan & Gibson, and (3) a pre-eruptive twisted magnetic flux rope equilibrium reached by relaxation from Amari et al. We measure the success of methods within "inverse horizontal field" regions in the boundary, which are mathematically defined by B_⊥ • ▽_⊥B_z > 0. When such regions overlap with the magnetic field neutral lines, they are known as "bald patches" (BPs) or inverse topology. Our most important conclusion is that the magnetic divergence-free method is far more successful than the other two methods within BPs. This method requires a second level of measurements of the vertical magnetic field. As high-quality multilevel magnetograms will come online in the near future, our work shows that multilayer magnetic field measurements will be highly desirable to objectively and successfully tackle the 180° ambiguity problem.
机译：太阳物理学中的一个众所周知的问题是，相对于磁场方向上的180°反转，横向磁场方向的解决方案是模棱两可的。在本文中，我们重点介绍三种消除应用于三个MHD模型的180°歧义的方法。这些方法是（1）参考场法，（2）磁压力梯度法和（3）无磁场发散法。这三种方法都是非迭代的，方法2和3是分析性的且快速的。我们将这些方法应用于三个MHD平衡模型领域：（1）Low的非线性无力磁场平衡的解析解;（2）Fan＆Gibson的新兴扭曲通量管的仿真;（3）a Amari等人的弛豫达到了喷发前扭曲磁通量绳的平衡。我们测量边界“反水平场”区域内方法的成功度，这些区域在数学上由B_⊥•▽_⊥B_z> 0定义。当此类区域与磁场中性线重叠时，它们称为“秃顶斑块” （BP）或逆拓扑。我们最重要的结论是，在BP中，无磁发散方法比其他两种方法更为成功。该方法需要对垂直磁场进行第二级测量。由于高质量的多级磁图将在不久的将来上线，因此我们的工作表明，多层客观的磁场测量对于客观，成功地解决180°歧义性问题将是非常必要的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号