A new MHD-assisted stokes inversion technique

©2017 The American Astronomical Society. All rights reserved. We present a new method of Stokes inversion of spectropolarimetric data and evaluate it by taking the example of a Sunrise/IMaX observation. An archive of synthetic Stokes profiles is obtained by the spectral synthesis of state-of-the-art...

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Autores: Riethmüller, T. L., Solanki, S. K., Barthol, P., Gandorfer, A., Gizon, L., Hirzberger, J., Noort, M. van, Blanco Rodríguez, J., Toro, José Carlos del, Orozco Suárez, David
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/147544
Acceso en línea:http://hdl.handle.net/10261/147544
Access Level:acceso abierto
Palabra clave:Magnetohydrodynamics (MHD)
Sun: magnetic fields
Sun: photosphere
Techniques: polarimetric
Techniques: spectroscopic
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spelling A new MHD-assisted stokes inversion techniqueRiethmüller, T. L.Solanki, S. K.Barthol, P.Gandorfer, A.Gizon, L.Hirzberger, J.Noort, M. vanBlanco Rodríguez, J.Toro, José Carlos delOrozco Suárez, DavidMagnetohydrodynamics (MHD)Sun: magnetic fieldsSun: photosphereTechniques: polarimetricTechniques: spectroscopic©2017 The American Astronomical Society. All rights reserved. We present a new method of Stokes inversion of spectropolarimetric data and evaluate it by taking the example of a Sunrise/IMaX observation. An archive of synthetic Stokes profiles is obtained by the spectral synthesis of state-of-the-art magnetohydrodynamics (MHD) simulations and a realistic degradation to the level of the observed data. The definition of a merit function allows the archive to be searched for the synthetic Stokes profiles that best match the observed profiles. In contrast to traditional Stokes inversion codes, which solve the Unno–Rachkovsky equations for the polarized radiative transfer numerically and fit the Stokes profiles iteratively, the new technique provides the full set of atmospheric parameters. This gives us the ability to start an MHD simulation that takes the inversion result as an initial condition. After a relaxation process of half an hour solar time we obtain physically consistent MHD data sets with a target similar to the observation. The new MHD simulation is used to repeat the method in a second iteration, which further improves the match between observation and simulation, resulting in a factor of 2.2 lower mean ${\chi }^{2}$ value. One advantage of the new technique is that it provides the physical parameters on a geometrical height scale. It constitutes a first step toward inversions that give results consistent with the MHD equations.The German contribution to Sunrise and its reflight was funded by the Max Planck Foundation, the Strategic Innovations Fund of the President of the Max Planck Society (MPG), DLR, and private donations by supporting members of the Max Planck Society, which is gratefully acknowledged. The Spanish contribution was funded by the Ministerio de Economía y Competitividad under Projects ESP2013-47349-C6 and ESP2014-56169-C6, partially using European FEDER funds. The National Center for Atmospheric Research is sponsored by the National Science Foundation. The HAO contribution was partly funded through NASA grant number NNX13AE95G. The National Solar Observatory (NSO) is operated by the Association of Universities for Research in Astronomy (AURA) Inc. under a cooperative agreement with the National Science Foundation. This work was partly supported by the BK21 plus program through the National Research Foundation (NRF) funded by the Ministry of Education of Korea.Peer reviewedAmerican Astronomical SocietyInstitute of Physics (Great Britain)Max Planck SocietyMinisterio de Economía y Competitividad (España)National Science Foundation (US)NASANational Research Foundation of KoreaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201720172017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/147544reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2013-47349-C6-1-Rinfo:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2014-56169-C6-1-Rhttps://doi.org/10.3847/1538-4365/aa5830Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1475442026-05-22T06:33:51Z
dc.title.none.fl_str_mv A new MHD-assisted stokes inversion technique
title A new MHD-assisted stokes inversion technique
spellingShingle A new MHD-assisted stokes inversion technique
Riethmüller, T. L.
Magnetohydrodynamics (MHD)
Sun: magnetic fields
Sun: photosphere
Techniques: polarimetric
Techniques: spectroscopic
title_short A new MHD-assisted stokes inversion technique
title_full A new MHD-assisted stokes inversion technique
title_fullStr A new MHD-assisted stokes inversion technique
title_full_unstemmed A new MHD-assisted stokes inversion technique
title_sort A new MHD-assisted stokes inversion technique
dc.creator.none.fl_str_mv Riethmüller, T. L.
Solanki, S. K.
Barthol, P.
Gandorfer, A.
Gizon, L.
Hirzberger, J.
Noort, M. van
Blanco Rodríguez, J.
Toro, José Carlos del
Orozco Suárez, David
author Riethmüller, T. L.
author_facet Riethmüller, T. L.
Solanki, S. K.
Barthol, P.
Gandorfer, A.
Gizon, L.
Hirzberger, J.
Noort, M. van
Blanco Rodríguez, J.
Toro, José Carlos del
Orozco Suárez, David
author_role author
author2 Solanki, S. K.
Barthol, P.
Gandorfer, A.
Gizon, L.
Hirzberger, J.
Noort, M. van
Blanco Rodríguez, J.
Toro, José Carlos del
Orozco Suárez, David
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Max Planck Society
Ministerio de Economía y Competitividad (España)
National Science Foundation (US)
NASA
National Research Foundation of Korea
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Magnetohydrodynamics (MHD)
Sun: magnetic fields
Sun: photosphere
Techniques: polarimetric
Techniques: spectroscopic
topic Magnetohydrodynamics (MHD)
Sun: magnetic fields
Sun: photosphere
Techniques: polarimetric
Techniques: spectroscopic
description ©2017 The American Astronomical Society. All rights reserved. We present a new method of Stokes inversion of spectropolarimetric data and evaluate it by taking the example of a Sunrise/IMaX observation. An archive of synthetic Stokes profiles is obtained by the spectral synthesis of state-of-the-art magnetohydrodynamics (MHD) simulations and a realistic degradation to the level of the observed data. The definition of a merit function allows the archive to be searched for the synthetic Stokes profiles that best match the observed profiles. In contrast to traditional Stokes inversion codes, which solve the Unno–Rachkovsky equations for the polarized radiative transfer numerically and fit the Stokes profiles iteratively, the new technique provides the full set of atmospheric parameters. This gives us the ability to start an MHD simulation that takes the inversion result as an initial condition. After a relaxation process of half an hour solar time we obtain physically consistent MHD data sets with a target similar to the observation. The new MHD simulation is used to repeat the method in a second iteration, which further improves the match between observation and simulation, resulting in a factor of 2.2 lower mean ${\chi }^{2}$ value. One advantage of the new technique is that it provides the physical parameters on a geometrical height scale. It constitutes a first step toward inversions that give results consistent with the MHD equations.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/147544
url http://hdl.handle.net/10261/147544
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2013-47349-C6-1-R
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2014-56169-C6-1-R
https://doi.org/10.3847/1538-4365/aa5830
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Astronomical Society
Institute of Physics (Great Britain)
publisher.none.fl_str_mv American Astronomical Society
Institute of Physics (Great Britain)
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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