Analysis of quiet-sun internetwork magnetic fields based on linear polarization signals

We present results from the analysis of Fe I 630 nm measurements of the quiet Sun taken with the spectropolarimeter of the Hinode satellite. Two data sets with noise levels of 1.2 × 10-3 and 3 × 10 -4 are employed. We determine the distribution of field strengths and inclinations by inverting the tw...

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Detalles Bibliográficos
Autores: Orozco Suárez, David, Bellot Rubio, Luis R.
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:10261/415131
Acceso en línea:http://hdl.handle.net/10261/415131
Access Level:acceso abierto
Palabra clave:Magnetic fields
Polarization
Sun: photosphere
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spelling Analysis of quiet-sun internetwork magnetic fields based on linear polarization signalsOrozco Suárez, DavidBellot Rubio, Luis R.Magnetic fieldsPolarizationSun: photosphereWe present results from the analysis of Fe I 630 nm measurements of the quiet Sun taken with the spectropolarimeter of the Hinode satellite. Two data sets with noise levels of 1.2 × 10-3 and 3 × 10 -4 are employed. We determine the distribution of field strengths and inclinations by inverting the two observations with a Milne-Eddington model atmosphere. The inversions show a predominance of weak, highly inclined fields. By means of several tests we conclude that these properties cannot be attributed to photon noise effects. To obtain the most accurate results, we focus on the 27.4% of the pixels in the second data set that have linear polarization amplitudes larger than 4.5 times the noise level. The vector magnetic field derived for these pixels is very precise because both circular and linear polarization signals are used simultaneously. The inferred field strength, inclination, and filling factor distributions agree with previous results, supporting the idea that internetwork (IN) fields are weak and very inclined, at least in about one quarter of the area occupied by the IN. These properties differ from those of network fields. The average magnetic flux density and the mean field strength derived from the 27.4% of the field of view with clear linear polarization signals are 16.3 Mx cm-2 and 220G, respectively. The ratio between the average horizontal and vertical components of the field is approximately 3.1. The IN fields do not follow an isotropic distribution of orientations. © 2012. The American Astronomical Society. All rights reserved..We thank J. C. del Toro Iniesta, B. W. Lites, and J. M. Borrero for stimulating discussions and comments that helped us to im- prove the analysis. D.O.S. thanks the Japan Society for the Pro- motion of Science (JSPS) for financial support through the post- doctoral fellowship program for foreign researchers. This work has been partially funded by the Spanish Ministerio de Inno- vaci´on y Ciencia through projects ESP2006-13030-C06-02 and PCI2006-A7-0624, and by Junta de Andaluc´ıa through Project P07-TEP-2687, including a percentage from European FEDER funds. Hinode is a Japanese mission developed and launched by ISAS/JAXA, collaborating with NAOJ as a domestic partner, NASA and STFC (UK) as international partners. Scientific oper- ation of the Hinode mission is conducted by the Hinode science team organized at ISAS/JAXA. This team mainly consists of scientists from institutes in the partner countries. Support for the post-launch operation is provided by JAXA and NAOJ (Japan), STFC (UK), NASA, ESA, and NSC (Norway). Use of NASA’s Astrophysics Data System is gratefully acknowledged.Peer reviewedIOP PublishingJapan Society for the Promotion of ScienceMinisterio de Ciencia e Innovación (España)Ministerio de Educación y Ciencia (España)Junta de AndalucíaEuropean CommissionJapan Aerospace Exploration AgencyNational Astronomical Observatory of JapanNASAScience and Technology Facilities Council (UK)European Space AgencyNorwegian Seafood FederationConsejo 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/10261/415131reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MEC//ESP2006-13030-C06-02info:eu-repo/grantAgreement/MICINN//PCI2006-A7-0624http://dx.doi.org/10.1088/0004-637X/751/1/2Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4151312026-05-22T06:33:51Z
dc.title.none.fl_str_mv Analysis of quiet-sun internetwork magnetic fields based on linear polarization signals
title Analysis of quiet-sun internetwork magnetic fields based on linear polarization signals
spellingShingle Analysis of quiet-sun internetwork magnetic fields based on linear polarization signals
Orozco Suárez, David
Magnetic fields
Polarization
Sun: photosphere
title_short Analysis of quiet-sun internetwork magnetic fields based on linear polarization signals
title_full Analysis of quiet-sun internetwork magnetic fields based on linear polarization signals
title_fullStr Analysis of quiet-sun internetwork magnetic fields based on linear polarization signals
title_full_unstemmed Analysis of quiet-sun internetwork magnetic fields based on linear polarization signals
title_sort Analysis of quiet-sun internetwork magnetic fields based on linear polarization signals
dc.creator.none.fl_str_mv Orozco Suárez, David
Bellot Rubio, Luis R.
author Orozco Suárez, David
author_facet Orozco Suárez, David
Bellot Rubio, Luis R.
author_role author
author2 Bellot Rubio, Luis R.
author2_role author
dc.contributor.none.fl_str_mv Japan Society for the Promotion of Science
Ministerio de Ciencia e Innovación (España)
Ministerio de Educación y Ciencia (España)
Junta de Andalucía
European Commission
Japan Aerospace Exploration Agency
National Astronomical Observatory of Japan
NASA
Science and Technology Facilities Council (UK)
European Space Agency
Norwegian Seafood Federation
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Magnetic fields
Polarization
Sun: photosphere
topic Magnetic fields
Polarization
Sun: photosphere
description We present results from the analysis of Fe I 630 nm measurements of the quiet Sun taken with the spectropolarimeter of the Hinode satellite. Two data sets with noise levels of 1.2 × 10-3 and 3 × 10 -4 are employed. We determine the distribution of field strengths and inclinations by inverting the two observations with a Milne-Eddington model atmosphere. The inversions show a predominance of weak, highly inclined fields. By means of several tests we conclude that these properties cannot be attributed to photon noise effects. To obtain the most accurate results, we focus on the 27.4% of the pixels in the second data set that have linear polarization amplitudes larger than 4.5 times the noise level. The vector magnetic field derived for these pixels is very precise because both circular and linear polarization signals are used simultaneously. The inferred field strength, inclination, and filling factor distributions agree with previous results, supporting the idea that internetwork (IN) fields are weak and very inclined, at least in about one quarter of the area occupied by the IN. These properties differ from those of network fields. The average magnetic flux density and the mean field strength derived from the 27.4% of the field of view with clear linear polarization signals are 16.3 Mx cm-2 and 220G, respectively. The ratio between the average horizontal and vertical components of the field is approximately 3.1. The IN fields do not follow an isotropic distribution of orientations. © 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/10261/415131
url http://hdl.handle.net/10261/415131
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MEC//ESP2006-13030-C06-02
info:eu-repo/grantAgreement/MICINN//PCI2006-A7-0624
http://dx.doi.org/10.1088/0004-637X/751/1/2
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
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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