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How to make the Sun look less like the Sun and more like a star?

Published online by Cambridge University Press:  12 September 2017

A. A. Vidotto Open the ORCID record for A. A. Vidotto [Opens in a new window]
A. A. Vidotto*
Affiliation:
School of Physics, Trinity College Dublin, the University of Dublin, Dublin-2, Ireland email: [email protected]
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Abstract

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Synoptic maps of the vector magnetic field have routinely been made available from stellar observations and recently have started to be obtained for the solar photospheric field. Although solar magnetic maps show a multitude of details, stellar maps are limited to imaging large-scale fields only. In spite of their lower resolution, magnetic field imaging of solar-type stars allow us to put the Sun in a much more general context. However, direct comparison between stellar and solar magnetic maps are hampered by their dramatic differences in resolution. Here, I present the results of a method to filter out the small-scale component of vector fields, in such a way that comparison between solar and stellar (large-scale) magnetic field vector maps can be directly made. This approach extends the technique widely used to decompose the radial component of the solar magnetic field to the azimuthal and meridional components as well, and is entirely consistent with the description adopted in several stellar studies. This method can also be used to confront synoptic maps synthesised in numerical simulations of dynamo and magnetic flux transport studies to those derived from stellar observations.

Keywords

stars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 237 - 239
Copyright
Copyright © International Astronomical Union 2017 

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