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Adjusting the Potential Field Source Surface Height Based on Magnetohydrodynamic Simulations

Huang, Zhenguang ; Tóth, Gábor ; Huang, Jia ; Sachdeva, Nishtha ; van der Holst, Bart ; Manchester, Ward B.

Astrophysical journal. Letters, 2024-04, Vol.965 (1), p.L1 [Periódico revisado por pares]

Austin: IOP Publishing

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Título:
Adjusting the Potential Field Source Surface Height Based on Magnetohydrodynamic Simulations
Autor: Huang, Zhenguang ; Tóth, Gábor ; Huang, Jia ; Sachdeva, Nishtha ; van der Holst, Bart ; Manchester, Ward B.
Assuntos: Alfven waves ; Approximation ; Atmospheric models ; Coronal magnetic fields ; Magnetic fields ; Magnetohydrodynamic simulation ; Magnetohydrodynamic waves ; Magnetohydrodynamics ; Potential fields ; Sea surface ; Solar atmosphere ; Solar cycle ; Solar magnetic field ; Solar magnetic fields ; Solar maximum ; Solar minimum
É parte de: Astrophysical journal. Letters, 2024-04, Vol.965 (1), p.L1
Descrição: Abstract A potential field solution is widely used to extrapolate the coronal magnetic field above the Sun’s surface to a certain height. This model applies the current-free approximation and assumes that the magnetic field is entirely radial beyond the source surface height, which is defined as the radial distance from the center of the Sun. Even though the source surface is commonly specified at 2.5 R s (solar radii), previous studies have suggested that this value is not optimal in all cases. In this study, we propose a novel approach to specify the source surface height by comparing the areas of the open magnetic field regions from the potential field solution with predictions made by a magnetohydrodynamic model, in our case the Alfvén Wave Solar atmosphere Model. We find that the adjusted source surface height is significantly less than 2.5 R s near solar minimum and slightly larger than 2.5 R s near solar maximum. We also report that the adjusted source surface height can provide a better open flux agreement with the observations near the solar minimum, while the comparison near the solar maximum is slightly worse.
Editor: Austin: IOP Publishing
Idioma: Inglês

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Adjusting the Potential Field Source Surface Height Based on Magnetohydrodynamic Simulations

Huang, Zhenguang ; Tóth, Gábor ; Huang, Jia ; Sachdeva, Nishtha ; van der Holst, Bart ; Manchester, Ward B.

Austin: IOP Publishing

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