The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field

Autores
van Driel Gesztelyi, Lidia; Démoulin, Pascal; Mandrini, Cristina Hemilse; Harra, L. K.; Klimchuk, J. A.
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We analyze the evolution of the fluxes observed in X-rays and correlate them with the magnetic flux density in active region (AR) NOAA 7978 from its birth throughout its decay, for five solar rotations. We use Solar and Heliospheric Observatory Michelson Doppler Imager (MDI) data, together with Yohkoh Soft X-Ray Telescope (SXT) and Yohkoh Bragg Crystal Spectrometer (BCS) data, to determine the global evolution of the temperature and the emission measure of the coronal plasma at times when no significant brightenings were observed. We show that the mean X-ray flux and derived parameters, temperature and emission measure (together with other quantities deduced from them, such as the density and the pressure), of the plasma in the AR follow power-law relationships with the mean magnetic flux density (B ). The exponents (b) of these power-law functions (aB b) are derived using two different statistical methods, a classical least-squares method in log-log plots and a nonparametric method, which takes into account the fact that errors in the data may not be normally distributed. Both methods give similar exponents, within error bars, for the mean temperature and for both instruments (SXT and BCS); in particular, b stays in the range [0.27, 0.31] and [0.24, 0.57] for full-resolution SXT images and BCS data, respectively. For the emission measure, the exponent b lies in the range [0.85, 1.35] and [0.45, 1.96] for SXT and BCS, respectively. The determination of such power-law relations, when combined with the results from coronal heating models, can provide us with powerful tools for determining the mechanism responsible for the existence of the high-temperature corona
Fil: van Driel Gesztelyi, Lidia. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
Fil: Démoulin, Pascal. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
Fil: Mandrini, Cristina Hemilse. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Harra, L. K.. Mullard Space Science Laboratory; Reino Unido
Fil: Klimchuk, J. A.. Spece Sciences División. Naval Research Laboratory; Estados Unidos
Materia
Solar Corona
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/21174

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network_name_str CONICET Digital (CONICET)
spelling The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic fieldvan Driel Gesztelyi, LidiaDémoulin, PascalMandrini, Cristina HemilseHarra, L. K.Klimchuk, J. A.Solar Coronahttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We analyze the evolution of the fluxes observed in X-rays and correlate them with the magnetic flux density in active region (AR) NOAA 7978 from its birth throughout its decay, for five solar rotations. We use Solar and Heliospheric Observatory Michelson Doppler Imager (MDI) data, together with Yohkoh Soft X-Ray Telescope (SXT) and Yohkoh Bragg Crystal Spectrometer (BCS) data, to determine the global evolution of the temperature and the emission measure of the coronal plasma at times when no significant brightenings were observed. We show that the mean X-ray flux and derived parameters, temperature and emission measure (together with other quantities deduced from them, such as the density and the pressure), of the plasma in the AR follow power-law relationships with the mean magnetic flux density (B ). The exponents (b) of these power-law functions (aB b) are derived using two different statistical methods, a classical least-squares method in log-log plots and a nonparametric method, which takes into account the fact that errors in the data may not be normally distributed. Both methods give similar exponents, within error bars, for the mean temperature and for both instruments (SXT and BCS); in particular, b stays in the range [0.27, 0.31] and [0.24, 0.57] for full-resolution SXT images and BCS data, respectively. For the emission measure, the exponent b lies in the range [0.85, 1.35] and [0.45, 1.96] for SXT and BCS, respectively. The determination of such power-law relations, when combined with the results from coronal heating models, can provide us with powerful tools for determining the mechanism responsible for the existence of the high-temperature coronaFil: van Driel Gesztelyi, Lidia. Centre National de la Recherche Scientifique. Observatoire de Paris; FranciaFil: Démoulin, Pascal. Centre National de la Recherche Scientifique. Observatoire de Paris; FranciaFil: Mandrini, Cristina Hemilse. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Harra, L. K.. Mullard Space Science Laboratory; Reino UnidoFil: Klimchuk, J. A.. Spece Sciences División. Naval Research Laboratory; Estados UnidosIOP Publishing2003-03-20info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/21174van Driel Gesztelyi, Lidia; Démoulin, Pascal; Mandrini, Cristina Hemilse; Harra, L. K.; Klimchuk, J. A.; The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field; IOP Publishing; Astrophysical Journal; 586; 1; 20-3-2003; 579-5910004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1086/367633info:eu-repo/semantics/altIdentifier/doi/10.1086/367633info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:23:43Zoai:ri.conicet.gov.ar:11336/21174instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:23:44.265CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field
title The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field
spellingShingle The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field
van Driel Gesztelyi, Lidia
Solar Corona
title_short The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field
title_full The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field
title_fullStr The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field
title_full_unstemmed The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field
title_sort The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field
dc.creator.none.fl_str_mv van Driel Gesztelyi, Lidia
Démoulin, Pascal
Mandrini, Cristina Hemilse
Harra, L. K.
Klimchuk, J. A.
author van Driel Gesztelyi, Lidia
author_facet van Driel Gesztelyi, Lidia
Démoulin, Pascal
Mandrini, Cristina Hemilse
Harra, L. K.
Klimchuk, J. A.
author_role author
author2 Démoulin, Pascal
Mandrini, Cristina Hemilse
Harra, L. K.
Klimchuk, J. A.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Solar Corona
topic Solar Corona
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We analyze the evolution of the fluxes observed in X-rays and correlate them with the magnetic flux density in active region (AR) NOAA 7978 from its birth throughout its decay, for five solar rotations. We use Solar and Heliospheric Observatory Michelson Doppler Imager (MDI) data, together with Yohkoh Soft X-Ray Telescope (SXT) and Yohkoh Bragg Crystal Spectrometer (BCS) data, to determine the global evolution of the temperature and the emission measure of the coronal plasma at times when no significant brightenings were observed. We show that the mean X-ray flux and derived parameters, temperature and emission measure (together with other quantities deduced from them, such as the density and the pressure), of the plasma in the AR follow power-law relationships with the mean magnetic flux density (B ). The exponents (b) of these power-law functions (aB b) are derived using two different statistical methods, a classical least-squares method in log-log plots and a nonparametric method, which takes into account the fact that errors in the data may not be normally distributed. Both methods give similar exponents, within error bars, for the mean temperature and for both instruments (SXT and BCS); in particular, b stays in the range [0.27, 0.31] and [0.24, 0.57] for full-resolution SXT images and BCS data, respectively. For the emission measure, the exponent b lies in the range [0.85, 1.35] and [0.45, 1.96] for SXT and BCS, respectively. The determination of such power-law relations, when combined with the results from coronal heating models, can provide us with powerful tools for determining the mechanism responsible for the existence of the high-temperature corona
Fil: van Driel Gesztelyi, Lidia. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
Fil: Démoulin, Pascal. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
Fil: Mandrini, Cristina Hemilse. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Harra, L. K.. Mullard Space Science Laboratory; Reino Unido
Fil: Klimchuk, J. A.. Spece Sciences División. Naval Research Laboratory; Estados Unidos
description We analyze the evolution of the fluxes observed in X-rays and correlate them with the magnetic flux density in active region (AR) NOAA 7978 from its birth throughout its decay, for five solar rotations. We use Solar and Heliospheric Observatory Michelson Doppler Imager (MDI) data, together with Yohkoh Soft X-Ray Telescope (SXT) and Yohkoh Bragg Crystal Spectrometer (BCS) data, to determine the global evolution of the temperature and the emission measure of the coronal plasma at times when no significant brightenings were observed. We show that the mean X-ray flux and derived parameters, temperature and emission measure (together with other quantities deduced from them, such as the density and the pressure), of the plasma in the AR follow power-law relationships with the mean magnetic flux density (B ). The exponents (b) of these power-law functions (aB b) are derived using two different statistical methods, a classical least-squares method in log-log plots and a nonparametric method, which takes into account the fact that errors in the data may not be normally distributed. Both methods give similar exponents, within error bars, for the mean temperature and for both instruments (SXT and BCS); in particular, b stays in the range [0.27, 0.31] and [0.24, 0.57] for full-resolution SXT images and BCS data, respectively. For the emission measure, the exponent b lies in the range [0.85, 1.35] and [0.45, 1.96] for SXT and BCS, respectively. The determination of such power-law relations, when combined with the results from coronal heating models, can provide us with powerful tools for determining the mechanism responsible for the existence of the high-temperature corona
publishDate 2003
dc.date.none.fl_str_mv 2003-03-20
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/21174
van Driel Gesztelyi, Lidia; Démoulin, Pascal; Mandrini, Cristina Hemilse; Harra, L. K.; Klimchuk, J. A.; The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field; IOP Publishing; Astrophysical Journal; 586; 1; 20-3-2003; 579-591
0004-637X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/21174
identifier_str_mv van Driel Gesztelyi, Lidia; Démoulin, Pascal; Mandrini, Cristina Hemilse; Harra, L. K.; Klimchuk, J. A.; The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field; IOP Publishing; Astrophysical Journal; 586; 1; 20-3-2003; 579-591
0004-637X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1086/367633
info:eu-repo/semantics/altIdentifier/doi/10.1086/367633
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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