Influence of Non-Potential Coronal Magnetic Topology on Solar-Wind Models

Influence of Non-Potential Coronal Magnetic Topology on Solar-Wind Models
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非位日冕磁拓扑对太阳风模型的影响

DOI:
10.1007/s11207-015-0795-8
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发表时间:
2015
期刊:
影响因子:
2.8
通讯作者:
Edwards S
Edwards S
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Edwards S

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通过比较磁摩擦模型的低日冕磁场的位场源表面模型,我们调查的经验太阳风模型的非潜在的磁结构的可能影响。这些经验模型(如Wang-Sheeley-Arge)仅从低日冕的磁场结构来估计太阳风速度的分布。我们的模型是在太阳表面和2.5太阳半径之间的域中计算的,并且使用Schatten电流片模型将它们扩展到0.1 Au。非势场具有比势场更复杂的磁骨架和准分界线结构,导致太阳风速度代理函数的子结构不同。它包含扭曲的磁结构,可以扰动从日光层电流片底部向下追踪的分界线表面。模型之间的一个显着差异是在非势模型中的开放磁通量更大。使用现有的经验公式,这导致更高的预测风速有两个原因:部分是因为磁通量管随着高度的增加而膨胀得不那么快,但更重要的是因为更多的开放场线远离冕洞边界。
By comparing a magneto-frictional model of the low-coronal magnetic-field to a potential-field source-surface model, we investigate the possible impact of non-potential magnetic structure on empirical solar-wind models. These empirical models (such as Wang–Sheeley–Arge) estimate the distribution of solar-wind speed solely from the magnetic-field structure in the low corona. Our models are computed in a domain between the solar surface and 2.5 solar radii, and they are extended to 0.1 AU using a Schatten current-sheet model. The non-potential field has a more complex magnetic skeleton and quasi-separatrix structures than the potential field, leading to different sub-structure in the solar-wind speed proxies. It contains twisted magnetic structures that can perturb the separatrix surfaces traced down from the base of the heliospheric current sheet. A significant difference between the models is the greater amount of open magnetic flux in the non-potential model. Using existing empirical formulae this leads to higher predicted wind speeds for two reasons: partly because magnetic-flux tubes expand less rapidly with height, but more importantly because more open-field lines are further from coronal-hole boundaries.
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发表时间: 2014
期刊: The Astrophysical Journal Letters
影响因子: --
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发表时间: 2009
期刊: The Astrophysical Journal
影响因子: --
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