Magnetohydrostatic modelling of stellar coronae

David MacTaggart; Scott Gregory; Thomas Neukirch; Jean-Francois Donati

doi:10.1093/mnras/stv2714

Magnetohydrostatic modelling of stellar coronae

David MacTaggart, Scott Gregory, Thomas Neukirch, Jean-Francois Donati

Research output: Contribution to journal › Article › peer-review

Abstract

We introduce to the stellar physics community a method of modelling stellar coronae that can be considered to be an extension of the potential field. In this approach, the magnetic field is coupled to the background atmosphere. The model is magnetohydrostatic and is a balance between the Lorentz force, the pressure gradient and gravity. Analytical solutions are possible and we consider a particular class of equilibria in this paper. The model contains two free parameters and the effects of these on both the geometry and topology of the coronal magnetic field are investigated. A demonstration of the approach is given using a magnetogram derived from Zeeman–Doppler imaging of the 0.75 M⊙ M-dwarf star GJ 182.

Original language	English
Pages (from-to)	767-774
Journal	Monthly Notices of the Royal Astronomical Society
Volume	456
Issue number	1
Early online date	17 Dec 2015
DOIs	https://doi.org/10.1093/mnras/stv2714
Publication status	Published - 11 Feb 2016

Keywords

MHD
Methods: analytical
Stars: coronae
Magnetic field

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10.1093/mnras/stv2714

MNRAS-2016-MacTaggart-767-74
© 2016, Publisher / the Author(s). This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at mnras.oxfordjournals.org / https://dx.doi.org/10.1093/mnras/stv2714
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Plasma Theory: Solar and Magnetospheric Plasma Theory
Hood, A. W. (PI), Mackay, D. H. (CoI), Neukirch, T. (CoI), Parnell, C. E. (CoI), Priest, E. (CoI), Archontis, V. (Researcher), Cargill, P. (Researcher), De Moortel, I. (Researcher) & Wright, A. N. (Researcher)
Science & Technology Facilities Council
1/04/13 → 31/03/16
Project: Standard
Magnetic Fields: the key to understandin: Magnetic fields: the key to understanding the physics of setllar evolution and exoplanetary systems
Gregory, S. (PI)
Science & Technology Facilities Council
1/10/12 → 30/09/17
Project: Fellowship

Cite this

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abstract = "We introduce to the stellar physics community a method of modelling stellar coronae that can be considered to be an extension of the potential field. In this approach, the magnetic field is coupled to the background atmosphere. The model is magnetohydrostatic and is a balance between the Lorentz force, the pressure gradient and gravity. Analytical solutions are possible and we consider a particular class of equilibria in this paper. The model contains two free parameters and the effects of these on both the geometry and topology of the coronal magnetic field are investigated. A demonstration of the approach is given using a magnetogram derived from Zeeman–Doppler imaging of the 0.75 M⊙ M-dwarf star GJ 182.",

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AU - MacTaggart, David

AU - Gregory, Scott

AU - Neukirch, Thomas

AU - Donati, Jean-Francois

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N2 - We introduce to the stellar physics community a method of modelling stellar coronae that can be considered to be an extension of the potential field. In this approach, the magnetic field is coupled to the background atmosphere. The model is magnetohydrostatic and is a balance between the Lorentz force, the pressure gradient and gravity. Analytical solutions are possible and we consider a particular class of equilibria in this paper. The model contains two free parameters and the effects of these on both the geometry and topology of the coronal magnetic field are investigated. A demonstration of the approach is given using a magnetogram derived from Zeeman–Doppler imaging of the 0.75 M⊙ M-dwarf star GJ 182.

AB - We introduce to the stellar physics community a method of modelling stellar coronae that can be considered to be an extension of the potential field. In this approach, the magnetic field is coupled to the background atmosphere. The model is magnetohydrostatic and is a balance between the Lorentz force, the pressure gradient and gravity. Analytical solutions are possible and we consider a particular class of equilibria in this paper. The model contains two free parameters and the effects of these on both the geometry and topology of the coronal magnetic field are investigated. A demonstration of the approach is given using a magnetogram derived from Zeeman–Doppler imaging of the 0.75 M⊙ M-dwarf star GJ 182.

KW - MHD

KW - Methods: analytical

KW - Stars: coronae

KW - Magnetic field

U2 - 10.1093/mnras/stv2714

DO - 10.1093/mnras/stv2714

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Magnetohydrostatic modelling of stellar coronae

Abstract

Keywords

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Projects

Plasma Theory: Solar and Magnetospheric Plasma Theory

Magnetic Fields: the key to understandin: Magnetic fields: the key to understanding the physics of setllar evolution and exoplanetary systems

Cite this