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Solar radius variations: new look on the wavelength dependence

Published online by Cambridge University Press:  09 September 2016

Jean-Pierre Rozelot ,
Alexander Kosovichev  and
Ali Kilcik
Jean-Pierre Rozelot
Affiliation:
Université de la Côte d'Azur, CNRS-OCA, Nice cedex 4, France email: jp.rozelot@orange.fr
Alexander Kosovichev
Affiliation:
New Jersey Institute of Technology, Newark, NJ 07103, USA email: sasha@bbso.njit.edu
Ali Kilcik
Affiliation:
Department of Space Science and Technologies, Akdeniz University, 07058 Antalya, Turkey email: alikilcik@akdeniz.edu.tr
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Abstract

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The possibility that the Sun's radius is changing, even at a faint level, has been discussed over a long time. As the solar radius is certainly one of the most important basic pieces of astrophysical information, it is crucial to determine the physical mechanisms that may cause shrinking or expansion of the solar envelope. The wavelength dependence has been poorly inspected up to now. Here we examine recent solar radius determinations from space observations, mainly from Mercury and Venus transits, made by different teams in 2006, 2012 and 2014. Seemingly, the results are not consistent: authors interpreted the discrepancies because of the different methods of analysis used in their work. However, looking at the wavelength dependence, adding other available observations, from X-EUV up to radio, a typical relationship between the radius and the wavelength can be found, reflecting the different heights at which the lines are formed. Possible explanations are discussed. Such results can be interesting for studying solar-stellar connections.

Keywords

astrometrySun: generalSun: fundamental parametersSun: photosphereSun: radio radiation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S320: Solar and Stellar Flares and their Effects on Planets , August 2015 , pp. 342 - 350
Copyright
Copyright © International Astronomical Union 2016 

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