An elliptic expansion of the potential field source surface model
An elliptic expansion of the potential field source surface model
复制标题
势场源表面模型的椭圆展开
DOI：
10.1051/0004-6361/202037734
复制
发表时间：
2020
影响因子：
6.5
通讯作者：
Hauptmann
中科院分区：
文献类型：
--
作者：
Heidrich-Meisner;Wimmer-Schweingruber;Hauptmann
背景势场源表面模型经常被用作进一步科学研究的基础，其中综合日冕磁场非常重要。它的参数，特别是源表面的位置和形状，对于解释行星际介质的状态至关重要。建议进行改进，在模型中引入一个或多个附加自由参数，例如当前的片源表面模型。目的放宽源表面的球形约束并允许其为椭圆形，使建模者可以选择对其进行变形，以更准确地匹配要分析的特定时期或位置的物理环境。方法提出了一种数值求解器，可使用有限差分在三维网格上求解拉普拉斯方程。该求解器能够处理结构化的球形网格，这些网格可以变形以创建椭圆形源表面。结果使用这种新的求解器呈现了日冕磁场的配置。三维渲染图与日冕不同高度的磁结构的卡林顿天气图相辅相成。说明了球形和椭圆形模型计算的磁配置的差异。
ContextThe potential field source surface model is frequently used as a basis for further scientific investigations where a comprehensive coronal magnetic field is of importance. Its parameters, especially the position and shape of the source surface, are crucial for the interpretation of the state of the interplanetary medium. Improvements have been suggested that introduce one or more additional free parameters to the model, for example, the current sheet source surface model.AimsRelaxing the spherical constraint of the source surface and allowing it to be elliptical gives modelers the option of deforming it to more accurately match the physical environment of the specific period or location to be analyzed.MethodsA numerical solver is presented that solves Laplace’s equation on a three-dimensional grid using finite differences. The solver is capable of working on structured spherical grids that can be deformed to create elliptical source surfaces.ResultsThe configurations of the coronal magnetic field are presented using this new solver. Three-dimensional renderings are complemented by Carrington-like synoptic maps of the magnetic configuration at different heights in the solar corona. Differences in the magnetic configuration computed by the spherical and elliptical models are illustrated.
影响因子：
6.5
作者：
V. Barra;V. Delouille;M. Kretzschmar;J. Hochedez
通讯作者：
V. Barra;V. Delouille;M. Kretzschmar;J. Hochedez
影响因子：
1.9
作者：
M. Schulz
通讯作者：
M. Schulz