S.J. Edwards
Influence of Non-Potential Coronal Magnetic Topology on Solar-Wind Models
Edwards, S.J.; Yeates, A.R.; Bocquet, F.-X.; Mackay, D.H.
Abstract
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.
Citation
Edwards, S., Yeates, A., Bocquet, F., & Mackay, D. (2015). Influence of Non-Potential Coronal Magnetic Topology on Solar-Wind Models. Solar Physics, 290(10), 2791-2808. https://doi.org/10.1007/s11207-015-0795-8
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 28, 2015 |
Online Publication Date | Oct 28, 2015 |
Publication Date | Oct 28, 2015 |
Deposit Date | Nov 2, 2015 |
Publicly Available Date | Oct 28, 2016 |
Journal | Solar Physics |
Print ISSN | 0038-0938 |
Electronic ISSN | 1573-093X |
Publisher | Springer |
Peer Reviewed | Peer Reviewed |
Volume | 290 |
Issue | 10 |
Pages | 2791-2808 |
DOI | https://doi.org/10.1007/s11207-015-0795-8 |
Keywords | Corona, models, Magnetic fields, corona, Magnetic fields, interplanetary, Magnetic fields, models, Solar wind, theory. |
Related Public URLs | http://arxiv.org/abs/1511.00427 |
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Copyright Statement
The final publication is available at Springer via http://dx.doi.org/10.1007/s11207-015-0795-8
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