Influence of Non-Potential Coronal Magnetic Topology on Solar-Wind Models
Influence of Non-Potential Coronal Magnetic Topology on Solar-Wind Models
复制标题
非位日冕磁拓扑对太阳风模型的影响
DOI:
10.1007/s11207-015-0795-8
复制
发表时间:
2015
期刊:
影响因子:
2.8
通讯作者:
Edwards S
中科院分区:
文献类型:
--
作者:
Edwards S
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.
DOI:
10.1088/2041-8205/782/2/l22
发表时间:
2014
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
B. Poduval;Xuepu Zhao
通讯作者:
Xuepu Zhao
DOI:
10.1088/2041-8205/787/1/l3
发表时间:
2013-12
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
L. Rachmeler;S. Platten;C. Bethge;D. Seaton;A. Yeates
通讯作者:
L. Rachmeler;S. Platten;C. Bethge;D. Seaton;A. Yeates
DOI:
10.1088/0004-637x/704/2/1021
发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
--
作者:
G. R. Cook;D. H. Mackay;D. Nandy
通讯作者:
D. Nandy