Study of single-lobed circular polarization profiles in the quiet sun

The existence of asymmetries in the circular polarization (StokesV) profiles emerging from the solar photosphere has been known since the 1970s. These profiles require the presence of a velocity gradient along the line of sight (LOS), possibly associated with gradients of magnetic field strength, in...

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Authors: Sainz Dalda, A., Martínez-Sykora, J., Bellot Rubio, Luis R., Title, A.
Format: article
Status:Versión aceptada para publicación
Publication Date:2012
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/415359
Online Access:http://hdl.handle.net/10261/415359
Access Level:Open access
Keyword:Line: profiles
Polarization
Sun: granulation
Sun: magnetic topology
Sun: photosphere
id ES_98fcb1b10309d3098f0fb7ccff72f5e7
oai_identifier_str oai:digital.csic.es:10261/415359
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Study of single-lobed circular polarization profiles in the quiet sun
title Study of single-lobed circular polarization profiles in the quiet sun
spellingShingle Study of single-lobed circular polarization profiles in the quiet sun
Sainz Dalda, A.
Line: profiles
Polarization
Sun: granulation
Sun: magnetic topology
Sun: photosphere
title_short Study of single-lobed circular polarization profiles in the quiet sun
title_full Study of single-lobed circular polarization profiles in the quiet sun
title_fullStr Study of single-lobed circular polarization profiles in the quiet sun
title_full_unstemmed Study of single-lobed circular polarization profiles in the quiet sun
title_sort Study of single-lobed circular polarization profiles in the quiet sun
dc.creator.none.fl_str_mv Sainz Dalda, A.
Martínez-Sykora, J.
Bellot Rubio, Luis R.
Title, A.
author Sainz Dalda, A.
author_facet Sainz Dalda, A.
Martínez-Sykora, J.
Bellot Rubio, Luis R.
Title, A.
author_role author
author2 Martínez-Sykora, J.
Bellot Rubio, Luis R.
Title, A.
author2_role author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Ministerio de Educación y Ciencia (España)
Junta de Andalucía
European Commission
Japan Aerospace Exploration Agency
NASA
Science and Technology Facilities Council (UK)
Norwegian Seafood Federation
International Space Science Institute
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Line: profiles
Polarization
Sun: granulation
Sun: magnetic topology
Sun: photosphere
topic Line: profiles
Polarization
Sun: granulation
Sun: magnetic topology
Sun: photosphere
description The existence of asymmetries in the circular polarization (StokesV) profiles emerging from the solar photosphere has been known since the 1970s. These profiles require the presence of a velocity gradient along the line of sight (LOS), possibly associated with gradients of magnetic field strength, inclination, and/or azimuth. We have focused our study on the StokesV profiles showing extreme asymmetry in the form of only one lobe. Using Hinode spectropolarimetric measurements, we have performed a statistical study of the properties of these profiles in the quiet Sun. We show their spatial distribution, their main physical properties, how they are related with several physical observables, and their behavior with respect to their position on the solar disk. The single-lobed StokesV profiles occupy roughly 2% of the solar surface. For the first time, we have observed their temporal evolution and have retrieved the physical conditions of the atmospheres from which they emerged using an inversion code implementing discontinuities of the atmospheric parameters along the LOS. In addition, we use synthetic Stokes profiles from three-dimensional magnetoconvection simulations to complement the results of the inversion. The main features of the synthetic single-lobed profiles are in general agreement with the observed ones, lending support to the magnetic and dynamic topologies inferred from the inversion. The combination of all these different analyses suggests that most of the single-lobed StokesV profiles are signals coming from the magnetic flux emergence and/or submergence processes taking place in small patches in the photosphere of the quiet Sun. © 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/10261/415359
url http://hdl.handle.net/10261/415359
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/MEC//AYA2009-14105-C06-06
info:eu-repo/grantAgreement/MICINN//PCI2006-A7-0624
http://dx.doi.org/10.1088/0004-637X/748/1/38
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
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling Study of single-lobed circular polarization profiles in the quiet sunSainz Dalda, A.Martínez-Sykora, J.Bellot Rubio, Luis R.Title, A.Line: profilesPolarizationSun: granulationSun: magnetic topologySun: photosphereThe existence of asymmetries in the circular polarization (StokesV) profiles emerging from the solar photosphere has been known since the 1970s. These profiles require the presence of a velocity gradient along the line of sight (LOS), possibly associated with gradients of magnetic field strength, inclination, and/or azimuth. We have focused our study on the StokesV profiles showing extreme asymmetry in the form of only one lobe. Using Hinode spectropolarimetric measurements, we have performed a statistical study of the properties of these profiles in the quiet Sun. We show their spatial distribution, their main physical properties, how they are related with several physical observables, and their behavior with respect to their position on the solar disk. The single-lobed StokesV profiles occupy roughly 2% of the solar surface. For the first time, we have observed their temporal evolution and have retrieved the physical conditions of the atmospheres from which they emerged using an inversion code implementing discontinuities of the atmospheric parameters along the LOS. In addition, we use synthetic Stokes profiles from three-dimensional magnetoconvection simulations to complement the results of the inversion. The main features of the synthetic single-lobed profiles are in general agreement with the observed ones, lending support to the magnetic and dynamic topologies inferred from the inversion. The combination of all these different analyses suggests that most of the single-lobed StokesV profiles are signals coming from the magnetic flux emergence and/or submergence processes taking place in small patches in the photosphere of the quiet Sun. © 2012 The American Astronomical Society. All rights reserved.This work was partially carried out while A.S.D. was a visiting scientist at the Instituto de Astrof´ısica de Andaluc´ıa. Financial support by the Spanish MICCIN through projects AYA2009-14105-C06-06 and PCI2006-A7-0624, and by Junta de Andaluc´ıa through project P07-TEP-2687 (including a per- centage from European FEDER funds) is gratefully acknowl- edged. Part of the data used here were acquired in the framework of HOP 14 (Hinode-Canary Islands joint campaign). Hinode is a Japanese mission developed by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated in cooperation with ESA and NSC (Nor- way). The Hinode project at Stanford and Lockheed is supported by NASA contract NNM07AA01C (MSFC). A.S.D. thanks the International Space Science Institute (hereafter ISSI) and I. Kiti- ashvili for the invitation to participate in the meeting “Filamen- tary Structure and Dynamics of Solar Magnetic Fields,” 15–19 November 2010, ISSI, Bern, where many aspects of this paper were discussed with other colleagues. This work has also bene- fited from discussions in the Flux Emergence meetings held at ISSI, Bern in 2011 February and December. We thank T. Tarbell for his corrections and suggestions. The 3D simulations have been run with the Njord and Stallo cluster from the Notur project and the Pleiades cluster through computing grants SMD-07- 0434, SMD-08-0743, SMD-09-1128, SMD-09-1336, SMD-10- 1622, SMD-10-1869, SMD-11-2312, and SMD-11-2752 from the High End Computing division of NASA. We thankfully ac- knowledge the computer and supercomputer resources of the Research Council of Norway through grant 170935/V30 and through grants of computing time from the Programme for Su- percomputing. To analyze the data we have used IDL and Vapor (http://www.vapor.ucar.edu).Peer reviewedIOP PublishingMinisterio de Ciencia e Innovación (España)Ministerio de Educación y Ciencia (España)Junta de AndalucíaEuropean CommissionJapan Aerospace Exploration AgencyNASAScience and Technology Facilities Council (UK)Norwegian Seafood FederationInternational Space Science InstituteConsejo 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/10261/415359reponame: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/MEC//AYA2009-14105-C06-06info:eu-repo/grantAgreement/MICINN//PCI2006-A7-0624http://dx.doi.org/10.1088/0004-637X/748/1/38Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4153592026-05-22T06:33:51Z
score 15,812429

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