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Stellar coronal response to differential rotation and flux emergence

Gibb, G.P.S.; Mackay, D.H.; Jardine, M.M.; Yeates, A.R.

Stellar coronal response to differential rotation and flux emergence Thumbnail


Authors

G.P.S. Gibb

D.H. Mackay

M.M. Jardine



Abstract

We perform a numerical parameter study to determine what effect varying differential rotation and flux emergence has on a star's non-potential coronal magnetic field. In particular we consider the effects on the star's surface magnetic flux, open magnetic flux, mean azimuthal field strength, coronal free magnetic energy, coronal heating and flux rope eruptions. To do this, we apply a magnetic flux transport model to describe the photospheric evolution, and couple this to the non-potential coronal evolution using a magnetofrictional technique. A flux emergence model is applied to add new magnetic flux on to the photosphere and into the corona. The parameters of this flux emergence model are derived from the solar flux emergence profile, however the rate of emergence can be increased to represent higher flux emergence rates than the Sun's. Overall we find that flux emergence has a greater effect on the non-potential coronal properties compared to differential rotation, with all the aforementioned properties increasing with increasing flux emergence rate. Although differential rotation has a lesser effect on the overall coronal properties compared to flux emergence, varying differential rotation does alter the coronal structure. As the differential rotation rate increases, the corona becomes more open, and more non-potential.

Citation

Gibb, G., Mackay, D., Jardine, M., & Yeates, A. (2016). Stellar coronal response to differential rotation and flux emergence. Monthly Notices of the Royal Astronomical Society, 456(4), 3624-3637. https://doi.org/10.1093/mnras/stv2920

Journal Article Type Article
Acceptance Date Dec 10, 2015
Online Publication Date Jan 14, 2016
Publication Date Mar 11, 2016
Deposit Date Jan 18, 2016
Publicly Available Date Jan 25, 2016
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 456
Issue 4
Pages 3624-3637
DOI https://doi.org/10.1093/mnras/stv2920
Keywords Stars: activity – stars: coronae, Stars: magnetic field, Stars: rotation.

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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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