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  The relationship between flux emergence and subsurface toroidal magnetic flux

Cameron, R. H., & Jiang, J. (2019). The relationship between flux emergence and subsurface toroidal magnetic flux. Astronomy and Astrophysics; EDP Sciences, Les Ulis Cedex A France, 631: A27. doi:10.1051/0004-6361/201834852.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-0A40-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-0A41-6
Genre: Journal Article

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Cameron, Robert H.1, 2, Author              
Jiang, J., Author
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              
2Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1832289              

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 Abstract: Aims. The 1D mean-field equation describing the evolution of the subsurface toroidal field can be used with the observed surface radial field to model the subsurface toroidal flux density. Our aim is to test this model and determine the relationship between the observationally inferred surface toroidal field (as a proxy for flux emergence), and the modelled subsurface toroidal flux density. Methods. We used a combination of sunspot area observations and the surface toroidal field inferred from Wilcox Solar Observatory (WSO) line-of-sight magnetic field observations. We then compared them with the results of a 1D mean-field evolution equation for the subsurface toroidal field, driven by the observed radial field from the National Solar Observatory/Kitt Peak and SOLIS observations. Results. We derive calibration curves relating the subsurface toroidal flux density to the observed surface toroidal field strengths and sunspot areas. The calibration curves are for two regimes, one corresponding to ephemeral region emergence outside of the butterfly wings, the other to active region emergence in the butterfly wings. We discuss this in terms of the size and vertical velocity associated with the two types of flux emergence.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1051/0004-6361/201834852
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Title: Astronomy and Astrophysics; EDP Sciences, Les Ulis Cedex A France
Source Genre: Journal
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Pages: - Volume / Issue: 631 Sequence Number: A27 Start / End Page: - Identifier: -