The WHI Corona from Differential Emission Measure Tomography

Autores
Vasquez, Alberto Marcos; Huang, Zhenguang; Manchester IV, Ward B.; Frazin, Richard A.
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A three dimensional (3D) tomographic reconstruction of the local differential emission measure (LDEM) of the global solar corona during the whole heliosphere interval (WHI, Carrington rotation CR-2068) is presented, based on STEREO/EUVI images. We determine the 3D distribution of the electron density, mean temperature, and temperature spread, in the range of heliocentric heights 1.03 to 1.23 Rsun. The reconstruction is complemented with a potential field source surface (PFSS) magnetic-field model. The streamer core, streamer legs, and subpolar regions are analyzed and compared to a similar analysis previously performed for CR-2077, very near the absolute minimum of the Solar Cycle 23. In each region, the typical values of density and temperature are similar in both periods. The WHI corona exhibits a streamer structure of relatively smaller volume and latitudinal extension than during CR-2077, with a global closed-to-open density contrast about 6% lower, and a somewhat more complex morphology. The average basal electron density is found to be about 2.23 and 1.08 x 10^8 cm^-3, in the streamer core and subpolar regions, respectively. The electron temperature is quite uniform over the analyzed height range, with average values of about 1.13 and 0.93 MK, in the streamer core and subpolar regions, respectively. Within the streamer closed region, both periods show higher temperatures at mid-latitudes and lower temperatures near the equator. Both periods show beta>1 in the streamer core and beta<1 in the surrounding open regions, with CR-2077 exhibiting a stronger contrast. Hydrostatic fits to the electron density are performed, and the scale height is compared to the LDEM mean electron temperature. Within the streamer core, the results are consistent with an isothermal hydrostatic plasma regime, with the temperatures of ions and electrons differing by up to about 10%. In the subpolar open regions, the results are consistent with departures from thermal equilibrium with Tions>Te (and values of Tions/Te up to about 1.5), and/or the presence of wave pressure mechanisms linear in the density.
Fil: Vasquez, Alberto Marcos. 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: Huang, Zhenguang. University of Michigan; Estados Unidos
Fil: Manchester IV, Ward B.. University of Michigan; Estados Unidos
Fil: Frazin, Richard A.. University of Michigan; Estados Unidos
Materia
Corona, Quiet
Magnetic Fields, Corona
Tomography
Differential Emission Measure
Euv Imaging
Stereo Mission
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:11336/20029

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oai_identifier_str oai:ri.conicet.gov.ar:11336/20029
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network_name_str CONICET Digital (CONICET)
spelling The WHI Corona from Differential Emission Measure TomographyVasquez, Alberto MarcosHuang, ZhenguangManchester IV, Ward B.Frazin, Richard A.Corona, QuietMagnetic Fields, CoronaTomographyDifferential Emission MeasureEuv ImagingStereo Missionhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1A three dimensional (3D) tomographic reconstruction of the local differential emission measure (LDEM) of the global solar corona during the whole heliosphere interval (WHI, Carrington rotation CR-2068) is presented, based on STEREO/EUVI images. We determine the 3D distribution of the electron density, mean temperature, and temperature spread, in the range of heliocentric heights 1.03 to 1.23 Rsun. The reconstruction is complemented with a potential field source surface (PFSS) magnetic-field model. The streamer core, streamer legs, and subpolar regions are analyzed and compared to a similar analysis previously performed for CR-2077, very near the absolute minimum of the Solar Cycle 23. In each region, the typical values of density and temperature are similar in both periods. The WHI corona exhibits a streamer structure of relatively smaller volume and latitudinal extension than during CR-2077, with a global closed-to-open density contrast about 6% lower, and a somewhat more complex morphology. The average basal electron density is found to be about 2.23 and 1.08 x 10^8 cm^-3, in the streamer core and subpolar regions, respectively. The electron temperature is quite uniform over the analyzed height range, with average values of about 1.13 and 0.93 MK, in the streamer core and subpolar regions, respectively. Within the streamer closed region, both periods show higher temperatures at mid-latitudes and lower temperatures near the equator. Both periods show beta>1 in the streamer core and beta<1 in the surrounding open regions, with CR-2077 exhibiting a stronger contrast. Hydrostatic fits to the electron density are performed, and the scale height is compared to the LDEM mean electron temperature. Within the streamer core, the results are consistent with an isothermal hydrostatic plasma regime, with the temperatures of ions and electrons differing by up to about 10%. In the subpolar open regions, the results are consistent with departures from thermal equilibrium with Tions>Te (and values of Tions/Te up to about 1.5), and/or the presence of wave pressure mechanisms linear in the density.Fil: Vasquez, Alberto Marcos. 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: Huang, Zhenguang. University of Michigan; Estados UnidosFil: Manchester IV, Ward B.. University of Michigan; Estados UnidosFil: Frazin, Richard A.. University of Michigan; Estados UnidosSpringer2011-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/20029Vasquez, Alberto Marcos; Huang, Zhenguang; Manchester IV, Ward B.; Frazin, Richard A.; The WHI Corona from Differential Emission Measure Tomography; Springer; Solar Physics; 274; 1-2; 12-2011; 259-2840038-0938CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1007/s11207-010-9706-1info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1012.5953info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs11207-010-9706-1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:21:58Zoai:ri.conicet.gov.ar:11336/20029instacron: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 10:21:58.891CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The WHI Corona from Differential Emission Measure Tomography
title The WHI Corona from Differential Emission Measure Tomography
spellingShingle The WHI Corona from Differential Emission Measure Tomography
Vasquez, Alberto Marcos
Corona, Quiet
Magnetic Fields, Corona
Tomography
Differential Emission Measure
Euv Imaging
Stereo Mission
title_short The WHI Corona from Differential Emission Measure Tomography
title_full The WHI Corona from Differential Emission Measure Tomography
title_fullStr The WHI Corona from Differential Emission Measure Tomography
title_full_unstemmed The WHI Corona from Differential Emission Measure Tomography
title_sort The WHI Corona from Differential Emission Measure Tomography
dc.creator.none.fl_str_mv Vasquez, Alberto Marcos
Huang, Zhenguang
Manchester IV, Ward B.
Frazin, Richard A.
author Vasquez, Alberto Marcos
author_facet Vasquez, Alberto Marcos
Huang, Zhenguang
Manchester IV, Ward B.
Frazin, Richard A.
author_role author
author2 Huang, Zhenguang
Manchester IV, Ward B.
Frazin, Richard A.
author2_role author
author
author
dc.subject.none.fl_str_mv Corona, Quiet
Magnetic Fields, Corona
Tomography
Differential Emission Measure
Euv Imaging
Stereo Mission
topic Corona, Quiet
Magnetic Fields, Corona
Tomography
Differential Emission Measure
Euv Imaging
Stereo Mission
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A three dimensional (3D) tomographic reconstruction of the local differential emission measure (LDEM) of the global solar corona during the whole heliosphere interval (WHI, Carrington rotation CR-2068) is presented, based on STEREO/EUVI images. We determine the 3D distribution of the electron density, mean temperature, and temperature spread, in the range of heliocentric heights 1.03 to 1.23 Rsun. The reconstruction is complemented with a potential field source surface (PFSS) magnetic-field model. The streamer core, streamer legs, and subpolar regions are analyzed and compared to a similar analysis previously performed for CR-2077, very near the absolute minimum of the Solar Cycle 23. In each region, the typical values of density and temperature are similar in both periods. The WHI corona exhibits a streamer structure of relatively smaller volume and latitudinal extension than during CR-2077, with a global closed-to-open density contrast about 6% lower, and a somewhat more complex morphology. The average basal electron density is found to be about 2.23 and 1.08 x 10^8 cm^-3, in the streamer core and subpolar regions, respectively. The electron temperature is quite uniform over the analyzed height range, with average values of about 1.13 and 0.93 MK, in the streamer core and subpolar regions, respectively. Within the streamer closed region, both periods show higher temperatures at mid-latitudes and lower temperatures near the equator. Both periods show beta>1 in the streamer core and beta<1 in the surrounding open regions, with CR-2077 exhibiting a stronger contrast. Hydrostatic fits to the electron density are performed, and the scale height is compared to the LDEM mean electron temperature. Within the streamer core, the results are consistent with an isothermal hydrostatic plasma regime, with the temperatures of ions and electrons differing by up to about 10%. In the subpolar open regions, the results are consistent with departures from thermal equilibrium with Tions>Te (and values of Tions/Te up to about 1.5), and/or the presence of wave pressure mechanisms linear in the density.
Fil: Vasquez, Alberto Marcos. 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: Huang, Zhenguang. University of Michigan; Estados Unidos
Fil: Manchester IV, Ward B.. University of Michigan; Estados Unidos
Fil: Frazin, Richard A.. University of Michigan; Estados Unidos
description A three dimensional (3D) tomographic reconstruction of the local differential emission measure (LDEM) of the global solar corona during the whole heliosphere interval (WHI, Carrington rotation CR-2068) is presented, based on STEREO/EUVI images. We determine the 3D distribution of the electron density, mean temperature, and temperature spread, in the range of heliocentric heights 1.03 to 1.23 Rsun. The reconstruction is complemented with a potential field source surface (PFSS) magnetic-field model. The streamer core, streamer legs, and subpolar regions are analyzed and compared to a similar analysis previously performed for CR-2077, very near the absolute minimum of the Solar Cycle 23. In each region, the typical values of density and temperature are similar in both periods. The WHI corona exhibits a streamer structure of relatively smaller volume and latitudinal extension than during CR-2077, with a global closed-to-open density contrast about 6% lower, and a somewhat more complex morphology. The average basal electron density is found to be about 2.23 and 1.08 x 10^8 cm^-3, in the streamer core and subpolar regions, respectively. The electron temperature is quite uniform over the analyzed height range, with average values of about 1.13 and 0.93 MK, in the streamer core and subpolar regions, respectively. Within the streamer closed region, both periods show higher temperatures at mid-latitudes and lower temperatures near the equator. Both periods show beta>1 in the streamer core and beta<1 in the surrounding open regions, with CR-2077 exhibiting a stronger contrast. Hydrostatic fits to the electron density are performed, and the scale height is compared to the LDEM mean electron temperature. Within the streamer core, the results are consistent with an isothermal hydrostatic plasma regime, with the temperatures of ions and electrons differing by up to about 10%. In the subpolar open regions, the results are consistent with departures from thermal equilibrium with Tions>Te (and values of Tions/Te up to about 1.5), and/or the presence of wave pressure mechanisms linear in the density.
publishDate 2011
dc.date.none.fl_str_mv 2011-12
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/11336/20029
Vasquez, Alberto Marcos; Huang, Zhenguang; Manchester IV, Ward B.; Frazin, Richard A.; The WHI Corona from Differential Emission Measure Tomography; Springer; Solar Physics; 274; 1-2; 12-2011; 259-284
0038-0938
CONICET Digital
CONICET
url http://hdl.handle.net/11336/20029
identifier_str_mv Vasquez, Alberto Marcos; Huang, Zhenguang; Manchester IV, Ward B.; Frazin, Richard A.; The WHI Corona from Differential Emission Measure Tomography; Springer; Solar Physics; 274; 1-2; 12-2011; 259-284
0038-0938
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1007/s11207-010-9706-1
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1012.5953
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs11207-010-9706-1
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
application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
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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