Assessing the behavior of modern solar magnetographs and spectropolarimeters

The design and later use of modern spectropolarimeters and magnetographs require a number of tolerance specifications that allow the developers to build the instrument and then the scientists to interpret the data accuracy. Such specifications depend both on device-specific features and on the physi...

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Detalles Bibliográficos
Autores: Del Toro Iniesta, J. C., Martínez Pillet, V.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2012
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/416767
Acceso en línea:http://hdl.handle.net/10261/416767
Access Level:acceso abierto
Palabra clave:Instrumentation: polarimeter
Polarization
Sun: photosphere
Sun: surface magnetism
Techniques: polarimetric
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spelling Assessing the behavior of modern solar magnetographs and spectropolarimetersDel Toro Iniesta, J. C.Martínez Pillet, V.Instrumentation: polarimeterPolarizationSun: photosphereSun: surface magnetismTechniques: polarimetricThe design and later use of modern spectropolarimeters and magnetographs require a number of tolerance specifications that allow the developers to build the instrument and then the scientists to interpret the data accuracy. Such specifications depend both on device-specific features and on the physical assumptions underlying the particular measurement technique. Here we discuss general properties of every magnetograph, such as the detectability thresholds for the vector magnetic field and the line-of-sight velocity, as well as specific properties of a given type of instrument, namely, that based on a pair of nematic liquid crystal variable retarders and a Fabry-Pérot etalon (or several) for carrying out the light polarization modulation and spectral analysis, respectively. We derive formulae that give the detection thresholds in terms of the signal-to-noise ratio of the observations and the polarimetric efficiencies of the instrument. Relationships are also established between inaccuracies in the solar physical quantities and instabilities in the instrument parameters. Such relationships allow, for example, one to translate scientific requirements for the velocity or the magnetic field into requirements for temperature or voltage stability. We also demonstrate that this type of magnetograph can theoretically reach the optimum polarimetric efficiencies of an ideal polarimeter, regardless of the optics in between the modulator and the analyzer. Such optics induce changes in the instrument parameters that are calculated. © 2012. The American Astronomical Society. All rights reserved.This work has been partially funded by the Spanish Ministerio de Ciencia e Innovaci´on, through Projects AYA2009-14105-C06 and AYA2011-29833-C06, and Junta de Andaluc´ıa, through Project P07-TEP-2687, including a percentage from European FEDER funds.Peer reviewedIOP PublishingMinisterio de Ciencia e Innovación (España)Junta de AndalucíaEuropean CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/416767reponame: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/MICINN//AYA2009-14105-C06-06info:eu-repo/grantAgreement/MICINN//AYA2011-29833-C06-03http://dx.doi.org/10.1088/0067-0049/201/2/22Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4167672026-05-22T06:33:51Z
dc.title.none.fl_str_mv Assessing the behavior of modern solar magnetographs and spectropolarimeters
title Assessing the behavior of modern solar magnetographs and spectropolarimeters
spellingShingle Assessing the behavior of modern solar magnetographs and spectropolarimeters
Del Toro Iniesta, J. C.
Instrumentation: polarimeter
Polarization
Sun: photosphere
Sun: surface magnetism
Techniques: polarimetric
title_short Assessing the behavior of modern solar magnetographs and spectropolarimeters
title_full Assessing the behavior of modern solar magnetographs and spectropolarimeters
title_fullStr Assessing the behavior of modern solar magnetographs and spectropolarimeters
title_full_unstemmed Assessing the behavior of modern solar magnetographs and spectropolarimeters
title_sort Assessing the behavior of modern solar magnetographs and spectropolarimeters
dc.creator.none.fl_str_mv Del Toro Iniesta, J. C.
Martínez Pillet, V.
author Del Toro Iniesta, J. C.
author_facet Del Toro Iniesta, J. C.
Martínez Pillet, V.
author_role author
author2 Martínez Pillet, V.
author2_role author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Junta de Andalucía
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Instrumentation: polarimeter
Polarization
Sun: photosphere
Sun: surface magnetism
Techniques: polarimetric
topic Instrumentation: polarimeter
Polarization
Sun: photosphere
Sun: surface magnetism
Techniques: polarimetric
description The design and later use of modern spectropolarimeters and magnetographs require a number of tolerance specifications that allow the developers to build the instrument and then the scientists to interpret the data accuracy. Such specifications depend both on device-specific features and on the physical assumptions underlying the particular measurement technique. Here we discuss general properties of every magnetograph, such as the detectability thresholds for the vector magnetic field and the line-of-sight velocity, as well as specific properties of a given type of instrument, namely, that based on a pair of nematic liquid crystal variable retarders and a Fabry-Pérot etalon (or several) for carrying out the light polarization modulation and spectral analysis, respectively. We derive formulae that give the detection thresholds in terms of the signal-to-noise ratio of the observations and the polarimetric efficiencies of the instrument. Relationships are also established between inaccuracies in the solar physical quantities and instabilities in the instrument parameters. Such relationships allow, for example, one to translate scientific requirements for the velocity or the magnetic field into requirements for temperature or voltage stability. We also demonstrate that this type of magnetograph can theoretically reach the optimum polarimetric efficiencies of an ideal polarimeter, regardless of the optics in between the modulator and the analyzer. Such optics induce changes in the instrument parameters that are calculated. © 2012. The American Astronomical Society. All rights reserved.
publishDate 2012
dc.date.none.fl_str_mv 2012
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/416767
url http://hdl.handle.net/10261/416767
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/MICINN//AYA2009-14105-C06-06
info:eu-repo/grantAgreement/MICINN//AYA2011-29833-C06-03
http://dx.doi.org/10.1088/0067-0049/201/2/22
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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
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